802.589.0911 Live Chat With Us

Finish Selecting Your Vehicle to Shop For Your Wheel Cylinder

Choose a Year for your GMC 's Wheel Cylinder

  • 2013
  • 2012
  • 2011
  • 2010
  • 2009
  • 2008
  • 2007
  • 2006
  • 2005
  • 2004
  • 2003
  • 2002
  • 2001
  • 2000
  • 1999
  • 1998
  • 1997
  • 1996
  • 1995
  • 1994
  • 1993
  • 1992
  • 1991
  • 1990
  • 1989
  • 1988
  • 1987
  • 1986
  • 1985
  • 1984
  • 1983
  • 1982
  • 1981
  • 1980
  • 1979
  • 1978
  • 1977
  • 1976
  • 1975
  • 1974
  • 1973
  • 1972
  • 1971
  • 1970
  • 1969
  • 1968
  • 1967
  • 1966
  • 1965
  • 1964
  • 1963
  • 1962
  • 1961
  • 1960
  • 1959
  • 1958
  • 1957
  • 1956
  • 1955
  • 1954
  • 1953
  • 1952
  • 1951
  • 1950
  • 1949
  • 1948
  • 1947
  • 1946
  • 1945
  • 1944
  • 1943
  • 1942
  • 1941
  • 1940
  • 1939
Show More Years

Shop By Brand

The Following brands are available based on your search.

  • ACDelco
    ACDelco
  • Centric
    Centric
  • Dorman
    Dorman
  • Dynamic Friction
    Dynamic Friction
  • Raybestos
    Raybestos
  • Wagner Brakes
    Wagner Brakes

Best Selling Genuine Gmc Wheel Cylinders

  • We Stock the following top leading brands, including Centric, ACDelco
  • Constantly Updated Inventory of Gmc Replacement Wheel Cylinder Parts
Centric
Qty:
$9.08
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
2001 - GMC Savana 1500 Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 11" Rear Drum Performance Pkg
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Drive Type Position
1998 - GMC Yukon RWD Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 11" Rear Drum
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1996 - GMC K1500 Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; Perf Pkg Police Pkg Rear Drum Brks
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Drive Type Position
2000 - GMC Yukon RWD Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1993 - GMC K1500 Suburban Rear
Centric
Qty:
$9.71
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1998 - GMC Safari Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 11" Rear Drum 7200lb GVW
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1996 - GMC C2500 Rear
Centric
Qty:
$9.08
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 6 Lug
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
2000 - GMC Savana 2500 Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 8 Lug
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Fuel Type Position
1997 - GMC Savana 2500 DIESEL Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 1" Bore 8 Lug
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Fuel Type Position
2002 - GMC Savana 2500 DIESEL Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; SRW
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1998 - GMC Savana 3500 Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; 11" Rear Drum 6 Lug
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Position
1994 - GMC K2500 Rear
Centric
Qty:
$9.71
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; exc LSD
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Doors Drive Type Rear Brake Position
1997 - GMC Jimmy 4 4WD Drum Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; LSD
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Transmission Doors Drive Type Rear Brake Position
1997 - GMC Jimmy Automatic 4 4WD Drum Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; High Rider Pkg
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Drive Type Position
1996 - GMC Sonoma 4WD Rear
Centric
Qty:
$9.85
Centric Drum Brake Wheel Cylinder  Rear
  • C-Tek Standard Wheel Cylinder
  • ; HD Chassis
  • C-TEK Standard Wheel Cylinder
  • Product Attributes:
    • California Proposition 65: Warning: Cancer And Reproductive Harm
  • Centric Parts offers a full line of C-Tek standard replacement brake and clutch parts for import and domestic vehicles. C-Tek components provide exceptional quality and value. Utilizing world-wide manufacturing sources allows Centric Parts to provide the highest quality replacement parts while maintaining value.
  • Suggested Purchase Quantity: 2
    • Most jobs typically require 2 of this item.
Brand: Centric
Position: Rear
Additional Fitment Information:
Vehicle Body Position
1989 - GMC C1500 Extended Cab Pickup Rear
ACDelco
1994 GMC C1500 Drum Brake Wheel Cylinder 8 Cyl 5.0L ACDelco

P311-5709197    W0133-2045984  New

Qty:
$143.00
ACDelco Drum Brake Wheel Cylinder
  • Professional DuraStop
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1994 - GMC C1500 V 8 Cyl 5.0L 305 -
ACDelco
1995 GMC C1500 Drum Brake Wheel Cylinder 8 Cyl 5.0L ACDelco

P311-5709197    W0133-2045984  New

Qty:
$143.00
ACDelco Drum Brake Wheel Cylinder
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • Genuine GM
Brand: ACDelco
Additional Fitment Information:
Vehicle Block Engine CID CC
1995 - GMC C1500 V 8 Cyl 5.0L 305 -
ACDelco
1991 GMC C1500 Drum Brake Wheel Cylinder ACDelco

P311-5709197    W0133-2045984  New

Qty:
$143.00
ACDelco Drum Brake Wheel Cylinder
  • This Original Equipment Manufacturer part is the same part that was made & installed by the car manufacturer at the factory where the car was produced.
  • Genuine GM
  • ; Excludes Standard Cab with Standard Chassis
Brand: ACDelco
Additional Fitment Information:
Vehicle
1991 - GMC C1500
ACDelco
1990 GMC K1500 Drum Brake Wheel Cylinder ACDelco

P311-5709197    W0133-2045984  New

Qty:
$143.00
ACDelco Drum Brake Wheel Cylinder
  • Professional DuraStop
  • ; with 10" Rear Drum - Excludes Standard Cab with Standard Chassis
Brand: ACDelco
Additional Fitment Information:
Vehicle
1990 - GMC K1500

Latest Gmc Repair and Wheel Cylinder Installation Advice

CarJunky AutoAdvice

Brake repair or lack of on 2000 GMC Sierra

Showing 3 out of 3 Posts
Question From dogsnponies on Brake repair or lack of on 2000 GMC Sierra

I had taken my truck in for repair as the the brakes were making noise and slow to stop. When I picked up the truck I was advised that the brakes were not in need of repair but instead were cleaned and adjusted. The receipt read: "Remove dual rear wheels, inspect shoes, drums, wheel cylinders and hardware, replace and torque to specification".
A few weeks later the rear brakes seized and caught on fire on the highway necessitating a tow for the truck and a horse trailer. The brakes had to be drilled off of the truck and the truck required new rear brake shoes, wheel cylinders and adjustment. I was told my the mechanic that the linings were paper thin.
My question is- what did this first shop do wrong or not do at all?

Response From DanD Top Rated Answer

After a couple of weeks worth of driving before the incident; I find it hard to believe they were adjusted incorrectly; with-in the first 10 or 20 miles you would have felt/smelt/seen something.
I have seen the self adjuster(s) do this and don’t ask me why?
It just happened to us on a 3500 GMC G van; we did a complete rear brake job; it got everything except drums (they were machined); about 6 months ago.
Last week the driver came in with smoke rolling out of the right rear drum. Pulled it apart; thinking I was going to see a failed axle seal or the bonding of the friction material had come off. But there was nothing visibly wrong other then you could see that the new adjuster lever had a worn mark on it from trying to ratchet the adjuster wheel? Everything was in place; the parking cable wasn’t over tightened, nothing? We replaced all the heat damaged components, machined the drum and sent him down the road; still not knowing why?
This part I’m only speculating on; this is a new driver (one week) with this company and he’s on a route where he has to back into a lot of loading docks with this van. If he’s a nervous two footed driver (especially backing up); it could explain why the adjuster got such a work out?
Back in the 80’s when full sized rear wheel drive Chryslers were the norm as taxi cabs; we would purposely leave the adjuster levers off. We blamed the constant stop & go and backing up that a cab does for the adjuster to walk themselves up and lock the wheels?

Dan.

Response From Hammer Time

They may have adjusted them to tightly or something in the self adjusters kept making them tighter. It is highly suspicious at the least but hard to prove anything.

92 gmc vandura brake warning light cause

Showing 2 out of 21 Posts | Show 19 Hidden Posts
Question From dalesvandura on 92 gmc vandura brake warning light cause

i have a 92 gmc vandura 2500 with the 5.7 and i have a brake warning light that wont go off on the dash i have checked my fluid levels they are fine i recently replaced my rotors pads and calipers bled them and the rear lines just make sure my mechanic didnt screw up i also have all new lines except for the ones from my master cylinder to the proportioning valve i would love any help i can get im willing to try just about any thing also i got a new battery had the people at the parts store install it and they knocked off and managed to unplug a black box that was mounted to upper section of the corner panel near the bulkhead

Response From cmvdvg

My 91 vandura has same light on but it does go off after a while I'm thinking there is a burr on emergency brake cable inside drum and its sticking. Its self adjusting rear brakes so the self adjusting mechanism (it looks like a star or a spur from a boot) is sticking or cable itself but let me know if u fix it and what the problem is

Response From Tom Greenleaf

Please start you own thread with your own specifics. This one is now old and done. Locked now to keep it from this...........

T

Response From nickwarner

two things come to mind, each as likely as the other. Either your master cylinder has a plastic reservoir and a plug in for a low fluid level sensor which is bad, or your e-brake pedal is slightly applied. Pull the e-brake release with one hand while pulling up one the pedal with the other and see if the light goes off. If so, you have found the gremlin. Otherwise, unplug the electrical connector at the master and see if the light goes off. If so, and the level of fluid in the master is within spec, its the sensor you unplugged at fault. This is assuming that all 4 brakes are functioning as they should of course.

Response From dalesvandura Top Rated Answer

park break is fine that was the first thing i checked seeing as how i do occasionally use it and no there is no plug on the master cylinder or on the plastic tanks there is one on the proportioning valve that does not change the status of light whether it is plugged in or not it also feels like only my front brakes are working despite all the rear brake componets checking out ok no leaks in the wheel cylinders and no unacceptable wear on the shoes and drums though when i bled the rears brakes i did not get the usual blast of brake fluid it was much more of a trickle

Response From Hammer Time

Take a large screwdriver and rap the side of the master cylinder reservoir with the handle a few times and see if the light goes off. It's very common for the float to stick at the bottom of the reservoir when it went dry during the repair and the flotation isn't enough to dislodge it from the gunk.

Response From dalesvandura

there is no float and it was just fine for a while other than not having rear brakes the lines from the master were plugged and the resovoir didnt go empty any idea what the little black box i described is that got disconnected and then put back in same time and thats about when this problem started but it also makes it feel like i now have rear brakes

Response From Hammer Time

Response From dalesvandura

hey this is pretty helpful except that one i dont have antilock breaks 2 i already tried the park brake check and disconnect of the switch and 3 the locations of the components to check are not listed like that in a haynes manual and i cant afford all data at the moment if you could post the diagram with the locations and numbers it would be a big help but other than that is there anything else that could cause this kind of a problem

Response From Hammer Time

I have given you the factory diagnostic procedure for your problem. If you can't figure it out from that, head to the shop.

Response From dalesvandura

see heres why i am doing it myself the dealer said they wont touch it my mechanic cant figure it out and im hoping some one else can give me some other thoughts on the matter and maybe think of something that got missed

Response From Hammer Time

I have given you a procedure that systematically eliminates all possible causes. If your unable to follow them, then you need to let someone else do it.

Response From dalesvandura

so your telling me im an idiot thanks i went to matc for diesel powertain servicing and have had to do ellectrical on damn near everthing fom cars and trucks to boats small planes hobby stuff even appliances and have not once failed i know what im doing but the information you have given me was not accurate i have no sensors in the back of the van any where around the brake system the only thing plugged in is the single wire plug on the proportioning valve which is mounted on the drivers side front frame rail and the park brake switch thats it if you want pictures il send them

Response From Hammer Time

So, did you unplug both of those switches as the test instructed?

Response From dalesvandura

c 163 so long as thats the single plug on the propotioning valve then yes i unplugged both as the diagnostic flow chart instructed and still nothing the light remained on hence my frustration its the only vehicle i have and i cant afford to take it back to the shop for a third time i know its a long shot to ask but no one has answered me about the little black box that is mounted above the battery that had been disconnected could that maybe have something to do with it something like a secondary computer for the braking system that got screwed up and would some pictures help so you can see what im seeing and talking about

Response From dalesvandura

so i unplugged said mysterious black box and the brake warning light went off and my brakes still function any ideas cause now im really confused

Response From Hammer Time

That is the ABS module you said your truck didn't have. Your truck has rear wheel only ABS and it's storing a code. That's why your light is on.

Response From dalesvandura

not mounted vertical horizontal and its about 4 in wide 7 in long and about 3/4 in thick and if this is the problem how would i go about retrieving said code and or deleting it all toghether and how does rear wheel only abs work cause im used to seeing the big ugly block that controls the pressure and pulses it but where is that on my van i have now should i use flash diagnostics or pull out my obd 1 scanner

Response From Hammer Time

Trouble codes can be accessed by connecting a TECH 1 scan tool or by manually grounding the ALDL connector. To manually ground the ALDL connector, connect a jumper wire between terminals A and H and observe the flashes of the brake warning lamp. Note the following when performing the Diagnostic Circuit Check to access trouble codes.

  1. When the terminals are jumped, count the number of short flashes starting from the initial long flash and including the long flash in the count.
  2. The count sequence will repeat as long as the ALDL connector terminals are jumped with the ignition on.
  3. Sometimes the first count sequence will be short. However, subsequent counts will be accurate.
  4. If more than one failure has occurred, only the first recognized failure code will be stored and flashed by the ECU.
  5. After determining the stored failure code, perform steps indicated by the diagnostic circuit check and follow the indicated failure code chart. After performing all indicated repairs, road test vehicle to check system operation, then recheck system for stored trouble codes.
This picture is for a Blazer but it shows the module






Response From Hammer Time

These codes are for a 93 but they should be the same. It's the same system

Response From Hammer Time

Are you talking about a flat module mounted vertically?

1991 GMC k1500 4X4 350cid 157000miles

Showing 2 out of 6 Posts | Show 4 Hidden Posts
Question From kshall00 on 1991 GMC k1500 4X4 350cid 157000miles

I have a GMC k1500 1991. my brake fluid turned black and my drivers rear brake was leaking. I replaced the cylinder on the rear brake and sucked out all the fluid from the master cylinder. I bled the brake lines to get clean fluid in them. everything seems to be working except when I step on the brakes it goes all the way to the floor and my brake warning light comes on. I can pump them twice and the light goes out and the pressure is back and will stop just fine. but take off from the stop and within 30 seconds if you step on brakes they go all the way to the floor again. again they pump up fine. but it is like my master cylinder is not holding the pressure?

Response From Hammer Time

Did it get contaminated with something? Is any of the rubber swelled like in the cap?

Response From kshall00

I am not sure of contamination. I purchased the truck back in 1997 and the fluid was black at that time. I decided this last year since I was replacing the rear cylinder I might as well clean it out. so I used a turkey baster to suck out the old fluid and replaced it and bled all the lines to get clean fluid out. there is no swelling of the rubber parts ie cap or seals. it does not lose any fluid.

Response From DanD

If you’re 100% sure that all the air has been bled out and there are no leaks; you’ll want to confirm whether the problem is at the wheel(s) or the master.
You can do this by clamping off all the flex lines with vice grips; being careful not to damage the flex lines; all you need to do is pinch them closed. Now try the pedal; if it is still soft with excessive travel, the issue is likely a bad master cylinder. If the pedal is hard and to the top; have a helper hold pressure on the pedal as you release the grips one at a time. When the pedal drops you’ve at least found the wheel or wheels that are at fault. From there you’ll have to determine why; out of adjustment, seized caliper guide pins or pads seized in their sliders.
Last thought and I haven’t confirmed whether this vehicle has only RWAL but if it does, there may be an issue with the ABS unit on the frame rail. Where some crap from you flushing the system has got into the units dump valve and every time you pump the pedal you’re actually filling the units accumulator before you get a solid pedal. Those ABS units were not serviceable; so it would mean replacing it or by-passing it. Most RWAL systems of that era have long crapped out so by-passing it would be a valid solution if it is the issue.

Dan.

Response From kshall00

I have one question.. is there suppose to be little steel bb's in the bottom of the master cylinder? I have 2 k1500's and the one I did not change the fluid on I noticed there was a little bb in teh bottom of the master cylinder. I still have the old fluid from the change so I can search though it with a magnet if I need to. but I believe I still had the bb in the one with a problem. but do I have it in the right place? would be my next thought.

thanks guys

Response From Tom Greenleaf Top Rated Answer

Hmmm - just the one leaking wheel cylinder. Not the exact case but do things in pairs.

Black fluid for a long time. Who could know now if you didn't save any. Pure even dirty brake fluid would wash off with plain water, if an oil in it, it wouldn't and be a nightmare that should have happened long ago.

With the pedal to the floor my guess is master cylinder tore up seals inside just bleeding for that fix and that it has traveled to bottom where it hadn't been.

Fluid does get dark over time but I wouldn't call it black?

T

Brakes pull to right

Showing 2 out of 3 Posts | Show 1 Hidden Posts
Question From homechanic on Brakes pull to right

I need some advice on brake repair;
1994 GMC Safari / Z Vin / RWD
Rear Drums / Front Disc
Problem: The vehicle pulls to the right when the brakes are applied. The harder you apply them the more it pulls the vehicle and turns the wheels to the right. When driving straight on level pavement, there is no drift.
The following items have been replaced;

  • LF Caliper
  • Rear brake pads
  • Front rotors, pads, bearings, seals

  • I checked that all the tires are the same pressure. I rotated the front tires, still pulls. When I replaced the LF caliper, brake fluid would flow freely from the line so I'm guessing that the line is not clogged however I'm still pulling. Any ideas anyone?

    Response From Hammer Time

    You should never change one caliper. Replace the other caliper and both front brake hoses and you should be good.

    Response From Tom Greenleaf Top Rated Answer

    Ditto! NEVER REPLACE JUST ONE CALIPER OR JUST ONE WHEEL CYLINDER!

    T

    1997 GMC K1500 Z71 Rear Brake Failure After Repair

    Showing 2 out of 5 Posts | Show 3 Hidden Posts
    Question From Repute3619 on 1997 GMC K1500 Z71 Rear Brake Failure After Repair

    The vehicle is a 1997 GMC Sierra K1500 Z71.

    After replacing the front brake pads, the extra pressure made the brake line leading to the rear burst. Also upon replacing the brake pads, it was discovered that the front drivers side bearings were worn out. The front drivers side hub was replaced and is working great. The brake line leading to the rear was replaced, brake lines were bled and now the brake pedal goes all the way to the floor and only the front brakes are working.

    After the repair the rear brakes were not working, I pumped the brakes quite a few times then went to back out of my driveway and the rear passenger side brake locked up after about 6 ft. out of my driveway. The rear was jacked up and after attempting to move the wheel by hand it released. There are still no rear brakes at all after driving it around the country a little to avoid any other vehicles incase the locking up occurred again.

    (EDIT) I wanted to add that since the repair the brake light on the dash is now on.

    I was hoping for any advice on what the issue may be now.

    Most recent related repairs include a front drivers side brake line leak 16 months ago. At the time the brake pedal was going most of the way to the floor and soon after a leak started to appear. The line was replaced and everything brake related was working fine up until the hub and brake line replacement that was done today (05/26/2012).

    Response From Tom Greenleaf

    Line that broke probably was from rust and was waiting to happen anyway. This locking up thing means rears need total inspection, parking brake and all. If brakes were bled doing the fronts, the master cylinder could have taken a hit. Techs should be able to figure this out in stride,

    T

    Response From nickwarner

    Did you use a proportioning valve depressor tool on the ABS unit when you bled it? If not you'll never get it go right. Costs about $35 from OTC, local parts stores can order one in.

    Response From Repute3619 Top Rated Answer

    Finally figured out the problem. The wheel cylinder! Also replaced a rear brake line and reset the ABS. Everything seems to be working great. Thanks for all the help. If anyone has any comments on problems they think may arise or otherwise, I'd be glad to hear! Thanks again everyone.

    Response From Tom Greenleaf

    So far so good - hope you did both sides as protocol with brakes is to do just that and if one failed the other probably isn't far behind,

    T