Question about 1991 GMC G3500

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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

New master cycl brake peddle holds until I start my truck peddle goes to floor

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  • GMC Master
  • 450 Answers

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

Posted on May 12, 2014

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Posted on Jan 02, 2017

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SOURCE: Park Brake Adjustment


Park Brake Adjustment (Disc Brake)

Tools Required

j 21177-A Drum-to-Brake Shoe Clearance Gage

Park Brake Shoe Adjustment

Caution: Refer to Brake Dust Caution.

Important: The park brake shoes must be adjusted before the park brake cable tension is adjusted.Set the J 21177-A so it contacts the inside diameter of the rotor

  1. Position the J 21177-A over the shoe and the lining at the widest point.
  2. Turn the adjuster nut until the lining just contacts the J 21177-A. Park brake shoe to brake rotor clearance: 0.6604 mm (0.026 in)
  3. Repeat steps 1-3 for the opposite side.
Park Brake Cable Tension Adjustment

Important: Before you adjust the park brake cable tension, verify that the park brake shoes are adjusted to provide a clearance of 0.6604 mm (0.026 in) and the rear disc brake rotors are installed.

  1. Verify the self adjuster lock-out pin has been removed.
  2. Fully apply and release the park brake pedal 3 times.

Posted on Feb 22, 2009

  • 91 Answers

SOURCE: i put all new brakes & lines on my 96 gmc pickup.how do i blead?

Its possible your master cylinder went bad, but if it wasnt bad just before you changed brakes i doubt thats it. Check your rear wheel cylinders that push out the pads to make sure their not leaking. Also check for leaking brakelines. Hope this helps.

Posted on Mar 22, 2009

  • 1201 Answers

SOURCE: Brake pedal still goes to floor 2000 GMC Jimmy

It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Posted on Sep 15, 2009

Testimonial: "Hadn't thought about the O-rings on the rod thanks for the idea. Great Idea Thanks!"

Nomodo4u
  • 863 Answers

SOURCE: 2007 gmc duramax brakes feel spongy, pedal goes

You gotta bleed your brakes and get all the air out dude.  Then put in new brake fluid.  Afterwards, make sure to pump the hell out of your brakes to build up brake pressure before you put this thing in drive or you will end up in the neighbors fence or a tree will stop you.

Posted on Oct 24, 2009

wracefans24
  • 1985 Answers

SOURCE: 1997 GMC Sierra 5.7 changed master cylinder

check under your master cylinder,is there another clyinder below with one line in and one line out,if you do I found this is for the Abs to the rear,I had to replace this it was full of air,and did exactly what yours is now

Posted on Dec 09, 2009

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1 Answer

Just asked how ti fix my issues with the brake problems I am having


When you say leaking off, I assume the pedal is soft or goes to the floor when depressed. Since all of the major brake system components have been changed, the brake lines are the next suspect. DO you notice any loss of brake fluid from the reservoir? Do you see any fluid leak on the ground or at the wheels?

Sep 27, 2012 | 2003 GMC Envoy

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Master cylinder replaced and still no brakes


Did you bleed the master cyclinder before installing it?

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Why do brakes go to floor but still have light pressure?


It sounds like you have air in your brake lines. This is usually caused by a very low brake fluid in the master cyclinder.
To fix this problem fill up the master cyclinder with brake fluid and bleed the front wheel brake cyclinders until the air bubbles are removed. Keep the master cyclinder topped up with brake fluid. Then bleed the rear wheel brake cyclinders until the air bubbles are removed. Don't forget to top up the brake fluid in the master cyclinder.

Dec 31, 2011 | 2004 Chevrolet Cavalier

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Installed 4 new rotors, 1 caliper and master cyclinder, can't get pressure for brakes


have someone pump up the brakes and hold to the floor open the bleeder on the caliper you changed when brake fluid comes out close. you might have to do this a few times until all air is out make sure you keep the brake fluid filled when doing it.

Aug 04, 2010 | Ford F-250 Cars & Trucks

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My brake pedal goes all the way to the floor


could be the seals in the master cyclinder

Apr 07, 2010 | 2003 Ford Escape

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I have a 2001 Pontiac Aztek. My brake pedal goes all the way to the floor. I have had new brakes and rotors replaced on the front and a new master cyclinder. Still same problem. My brake fluid has always...


Was the brake system bled after the master cylinder was installed?

After anyh brake work is performed, particularly with disk brakes, you have to pump the system up to get the calipers reset. Start engine, pump the brake pedal several times, and you will begin to feel the brakes come back up, assuming everything else has been properly repaired.

Let me know what you find.

Dec 14, 2009 | 2001 Pontiac Aztek

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Brake pedal still goes to floor 2000 GMC Jimmy


It's very possible to be the master cylinder, the o-rings on the piston could be worn, letting the fluid seep back through instead of getting full pressure through the lines. Could also be the brake booster.
Try changing the master cylinder first, which is cheaper and easier, and see if there is a difference, you'll need to bleed the brakes again.
To check the booster,
With the engine off, pump the brakes until the pedal is hard, then hold pressure on the brake pedal and listen for air escaping, or the pedal goes slowly to the floor, Do that after the master cylinder has been changed, at least that will be eliminated.

Sep 15, 2009 | 2000 GMC Jimmy

1 Answer

How to tell if the Brake Master Cyclinder is bad on 1991 VW Golf. About 4 months ago new front and rear brakes installed by repair shop. Front got both, new calipers, both new pads, both new rotors. ...


you can tell if the break master cyclinder is bad, if you don't have any break action or peddle to the floor, break is sticking, or any other break related symtom, not normal to your daily driving.

Oct 15, 2008 | Volkswagen Golf Cars & Trucks

1 Answer

I just put new calipers on my jeep and anew master cyclinder when i pump the brakes and bleed the front calipers and release the pedal the fluid leeks back into the master cyclinder


Did u bleed the master cylinder before u installed it? If not, you'll have to also bleed the rear brakes. starting w/ the bleeder the farthest away, to next greatest distance,etc til u get to the closest bleeder.
If u did bleed the master cyl. before installation, I'm wondering if u did the following:
have someone pump the brakes (3 times, don't mash the pedal to the floor, just gentle push no more than half way down 3 times, while holding pedal half way down 3rd pump, open bleeder, when fluid or air slows coming out, close bleeder, and repeat, until only clean fluid flows. And of course, don't let the fluid get too low in the master cyl, or you will **** in air and have to start all over. Let me know how you do. countrycurt0

Sep 27, 2008 | Jeep CJ5 Cars & Trucks

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