Question about 1991 GMC K1500

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I have a 1991 gmc k1500 4x4 my problem is with the spongy brakes i've replaced master cyl and still have the same problem what else coul it be ? thankx

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Adjust the rear brakes up manually ,and grind the lip down on the edge of the brake drum so you can adjust brakes right up before you refit the drum

Posted on Aug 23, 2010

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1 Answer

I have a 2003 GMC Duramax i installed a new master cyclinder my brakes hold untill i start my truck then they go to the floor


Bleed the brake system, You should have bled the master cyl on the bench before installation..

May 12, 2014 | 1991 GMC G3500

2 Answers

Spongy brake pedal. A stumper!


try adjusting the rear brake shoes up
the indications are that there is too much shoe to drum clearance so the shoes have to be expanded out to touch the drum and that is about a pedal travel length
try also bleed the master cylinder first at the lines connections as it it is very possible that air is locked in the master cyl and it is not getting a full load of fluid to bleed properly

Mar 27, 2017 | Cars & Trucks

1 Answer

My brakes are spongy after brakes job and bleeding. The calipers looked ok except for one but i didn't replace them. And the ABS light is on still. It takes a couple pumps to get the braked to work....


This week no one even puts down a vehicle or any info
of what was done & by whom Please do that

Spongy is a system not bleed correctly & it has to be
flushed every 2 years on all vehicles

If the car is 10 years old you need to clean out the moisture
from the master cyl piston,replace flex hoses & calipers

Dec 01, 2012 | Cars & Trucks

1 Answer

REplaaced brake pads and spped sensor on 2006 gmc sierra now brakes are spongie at times and have bled them.


DEPENDS WHAT PROCEDURE YOU USE TO REPLACE THEM.IF YOU PUSHED THE CALIPER PISTONS IN WITHOUT OPENING THE BLEEDER AND USING A **** CLOSED THE BRAKE HOSES YOU MANAGED TO SENT BACKWARDS THE FLUID INTO THE MASTER CYLINDER WHERE IS THE POSSIBILITY TO CAUSE THE SEALS ROLLING IN AND ARE NOT HOLDING PRESSURE. THE OTHER REASON IS EITHER YOU NEED TIME UNTIL THE BRAKES BED ON THE DISCS SURFACES.

Aug 30, 2012 | 2006 GMC Sierra

1 Answer

Replaced rear brake lines and bled all lines pedal still spongy sounds like air in master cylinder


Try opening the bleeders and don't pump the pedal,just let gravity flow out the fluid,(master cyl.cap off)keeps the air from being churned into foam. Also try appling the E-brake and see if the pedal feels better,if it does it's just the rear being out of adjustment

Mar 09, 2011 | 1988 Oldsmobile Delta 88

1 Answer

Bleeding clutch


Bleeding because you replaced parts? or it's getting soft/spongy / you have a leak. If the latter then you need to fix the leak first ... worn master or slave cyl. Otherwise bleeding is like a brake cylinder ... someone pushes on the peddle ... helper opens the bleed screw to let air and fluid out ... close bleed screw ... release pedal ... repeat.
Make sure the master cyl doesn't run out of fluid.

Dec 03, 2010 | 1994 Toyota Pickup

1 Answer

Brake servo master cyl flexing and moving to bulk head making the foot brake pedle spungy soft insufistant reserve travel


I think your saying you have a spongy pedal. have the brake system checked for leaks ( externally as well as internally eg master cylinder) and wear. If a-ok then have them bleed the system.
Now if your saying there is a problem with pedal travel
that has to do with pedal rod adjustment( which is only adjusted after replacing a master cylinder or booster)

Apr 14, 2010 | 2000 Ford Escort

2 Answers

Brake are pungy on04gmc envoy


it would sound like your master cylinder if you did bleed your brakes right.

Aug 25, 2009 | 2004 GMC Envoy

1 Answer

Spongy brakes


Does sound like you need a new master cylinder. On a 2000 you wont need to back bleed. You will just need to follow the instruction and bleed the master and all four points. you will probably need to bleed the ABS block and proportioning valve but only if they have bleeders on them.

May 31, 2009 | 2000 Ford Explorer

1 Answer

Brake repair


i had a problem once that the rear drums were turned to far out and caused me to have to pump and also have a spongy pedal....just a thought

Aug 09, 2008 | 1985 Chevrolet C1500

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