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2003 GMC HD 2500 Brakes are locking up while driving. I have had to loosen the brake line at the master cylinder to be able to move the truck. This is the 3rd time this has happened. HELP

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I have an 03 same truck i had to put new rear brake calipers on it .they will lock up and will release but lock up again .Put in new ones problem will go away .You will need to put in new pads maybe .

Posted on Oct 19, 2013

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  • Chevrolet Master
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Sounds like the serov on the brake system has gone could be the abs side or the master cylinder its self. with engine running can you hear a hissing sound from the master cylinder. ??

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

txkjun
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SOURCE: 1992 Ford F350 Dually Diesel Truck Brake System problem.

Adjust your rear brake shoes. Then rebleed the system. Start at the master cylinder Bleed master first then the wheel furthest away from the master (right rear then left rear then right front then left front. Do that and your pedal should be good.

Posted on Dec 30, 2008

  • 232 Answers

SOURCE: Spongy brakes after bleeding them 2 times. Should I try to bleed the master cylinder or replace it?

Honestly your guess is as good as mine. But I don't think the master cylinder is NOT bad you still have air in the system. Get a big bottle of brake fluid bleed all four sides until you run out of fluid or your brakes work properly. You should divide the bottle's content in four, then use each quantity in each side. You'll be removing air and contaminated fluid from the system. Get a small hose that fits on the bleeders and an appropriate container. I have a good feeling if you do this your brakes will work just fine. I don't know how you are bleeding the brakes. I'll let you know the proper way just in case. This is a two man job, with the wheel off, have someone start the car. Have them pump the brakes a few times to get pressure. 1With the brake pedal UP open the bleeder, 2then have your assistant press the brake pedal all the way down and leave it completely pressed down. 3Close the bleeder valve, once close and only with the valve closed have'm release the brake. Repeat as necessary, bake depressed, open valve first then press brake. DO NOT depress until valve completly closed. Close valve THEN depress. Good Luck!

Posted on May 15, 2009

  • 139 Answers

SOURCE: Front brakes lock up causing hot and smoking front brakes.

This sounds like the master cylinder isnt releasing pressure I would change master cylinder.

Posted on Jul 30, 2009

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1 Answer

2001 Silverado 2500 HD Why Rear brakes don't work after I installed new hydro-boost power booster, master cylinder, calipers, and pads. I bled master cylinder before installing, and brakes beginn


Hello Patricia,

Have you checked the master brake cylinder reservoir for brake fluid loss?

I don't suspect the master cylinder as you have replaced it... but am more suspect of a leaking brake line or fitting which should have
been discovered when you had the system bled.

The only time I ever had a rear brake problem with a 2500 series Chevrolet was due to seized rear brake caliper guide pins...as your calipers are also new that is not your problem.

If your brake pedal feels spongy and travels to the floor board you have air in the system, a brake fluid leak or a failure in the power steering system, such as a broken hose, broken power steering pump drive belt, or failed pump, would result in a loss of pressure to both the hydro-boost and steering.

Find more information here:

. Hydro Boost Power Assist Systems Operation Diagnosis and Repair

Jul 23, 2017 | 2001 Chevrolet Silverado 2500HD

1 Answer

All brake lines go to a box not sure which line goes to which hole.


The master cyl. has two resivors in it the large one is for the front brakes and the small one for the rears. Follow the lines coming from the front wheels to the block and the line from the large should go there. But it seems to me that the line had different size fittings so they could not get crossed up??

Mar 04, 2013 | 2004 GMC Sierra

1 Answer

Front line blow, replaced line master cly to abs block and from abs to right front wheel. bleed have very low and soft paddle.on 03 gmc 2500 hd 4x4. did not put all the turns and bends back in line does...


Ok here is what you have to do. First off make sure your master cylinder is full, Second your vehicle must be running when you bleed brakes that is equiped with ABS this allows the ABS pump to to run you must bleed both front brakes starting at the passenger side wheel then moving to the drivers side. It will take quit a bit of bleeding and be sure to keep checking fluid level in master cylinder well bleeding. Just remeber the vehicle must be running while bleeding the brakes.

May 12, 2011 | Chevrolet 2500 Cars & Trucks

1 Answer

ALL 4 BRAKES LOCK UP...


All 4 brakes are locked up? Did they just lock up all of a sudden? What are the condition of the brake pads and rotors? If they are good you may have a bad master cylinder or even debooster. Here area couple things you might try. On your debooster there is a vacuum hose. With all four wheels off the ground, unplug the hose to the debooster and check if any wheels unlock. If not, try breaking loose one line at a time at your master cylinder and checking to see if any wheels loosen up. Since your saing ALL four wheels locked up I doubt it 's a caliper or flex line problem. Anyhow if either of those help to loosen the wheels then you've found which part is bad. One note tho, just crack the lins loose at master cylinder till you see a drip of fluid do not remove them and if one doesn't d it then tighten it back and move onto the next.

Sep 02, 2010 | 1994 Ford Probe

1 Answer

1997 GMC Sierra 5.7 changed master cylinder calipers and brake pads. I have a hard pedal until I turn the truck on and the pedal goes to the floor? Is there something I am missing? I have bled the brakes...


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

Dec 06, 2009 | 2003 GMC Sierra 1500

1 Answer

Bad brakes on gmc suburban, replaced master cylinder,rear wheel cylinder and abs control module,bled system,still have spongy brakes and ABS come on right before it gets stopped.


Gravity bleed your brakes starting at the wheel farthest from the master cylinder. No pweddle pumping. I Fill M/C and leave cover off. Then open the bleeder and watch what is coming out. Uou can see bubbles. When the fluid drips steady and without bubbles, cole and do the same to the other three. Don't let the master cykinder get low because thr fluid level helps move the fluid and air through the lines.Periodically tap the break lone with your wrench to keep everything moving.. When sll bleeders drip clean and steady. Make sore your rear brakes are adjusted to barely touch the drum. Then top off the master cylinder, cap it and give yourself a "break". :)

Jun 15, 2009 | 1997 GMC Sierra K2500

1 Answer

I have a gmc 2500 4x4 and rear brakes locking up


Do you have a/the proportioning valve in your system? Pin needs to be pulled out for centering while bleeding.

Jan 25, 2009 | 1985 GMC C2500

1 Answer

1986 gmc sierra 1500 front rt brake locks up


check brake lines they may have gotten pinched very commonok new c/k trucks when you crank the torsion bars up to far you may have hit something and pinched the brake line check those before messing with the master cylinder those are a real pain

Sep 20, 2008 | 1999 GMC Sierra

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