Question about 2005 GMC Sierra 1500 Hybrid

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I have a brake problem on my 2005 GMC sierra

As I drive down the highway my brakes tighten and get hot. If I stop and depress the brake pedal hard it releases but will gradually tighen again.

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  • Contributor
  • 14 Answers

Sounds like the master cylinder is not releasing. Replace it

Posted on May 18, 2014

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  • 2 Answers

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Posted on Jan 02, 2017

HellPoolHall
  • 74 Answers

SOURCE: 2004 GMC sierra 1500 4x4 brakes

Have you checked the hardware on the disc brakes all the way around, as well as checking the rear pads? Wore out hardware could cause you to require more pressure to get the pads to move, as well as low brakes on the rear. Your braking system sends more pressure to the front of the vehicle because it requires more pressure up there. Less pressure on the rear can cause this to happen. I'm willing to bet the problem from the pedal is coming from the rear brakes somewhere and not the front. The last possibility that I can think if is a problem in the ABS solonoids, they might not be opening up all the way causing you to require more pressure.

Posted on Aug 07, 2008

Tech Jenkins
  • 359 Answers

SOURCE: 1999 GMC Sierra brake problem

When you change the master cylinder it is best to gravity bleed first, then proceed to the pedal technique.

Gravity bleeding is when you just open the valve and let gravity pull the fluid down.

Keep in mind you must "prime" the master cylinder first before installing it, did you do that?

Priming the master cylinder is where you put it in a vise gently, you then take apaptors and screw into the outlets, then take tubes from the adaptors back into the resoirvor. You fill the resorvoir up with fluid and take a 3/8 extension for a socket and push the piston in and out slowly until there are no more air bubbles.

After this procedure you gravity bleed the brakes, then go on to the pedal technique.

Posted on Sep 04, 2008

  • 314 Answers

SOURCE: brake problem

Hi Tora, Go to the back brakes. This is where the prob could be. But with you bleeding the brakes, the peddle has went beyond its normal travel causing the rubbers in the master cylinder to get messed up. Happens too often! Replace the master cylinder 'after' you had a good look at the back! Frankster016

Posted on Oct 25, 2008

  • 71 Answers

SOURCE: brake lights dont work

make sure your geetin 12v to brake switch if not jumper a wire then try it

Posted on Mar 29, 2009

  • 14036 Answers

SOURCE: 2003 Sonoma SLS 6 cylinder 4.3L ABS issue

I WOULD NOT KEEP DRIVING IT.WHEN ABS LIGHTS AND BRAKE LIGHTS COME ON.YOU HAVE BRAKE FAILURE. TOW IT TO DEALERSHIP HAVE IT SERVICE.AND CHECK THE ABS BRAKES SYSTEM .BECAUSE ABS BRAKE SYSTEM IS NOT A HOME FIX.BECAUSE THE ABS HYDRAULIC MODULATOR UNIT HAS LOWER FROM HOME POSITION .IN ORDER TO MOVE THE MASTER CYLINDER FROM UNIT.YOU NEED A TECH 2 SCANNER TO DO THE JOB.TO GET ABS BRAKES TO BLEED RIGHT BEST TO GET THEM PRESSURE BLEED INSTEAD OF MANUAL BLEEDING GET LESS AIR IN SYSTEM.THAT WHY SEE DEALER SHIP HAS THE THINGS TO DO THE JOB.

Posted on Jun 06, 2009

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1 Answer

My brake pedal will not budge, and a hissing noise present when running


The stop lights won't go out until the pedal is depressed, as there is a switch which is activated by the pedal.

A hard brake pedal is probably caused by a defective servo. The hissing noise is probably an air leak in the servo.

Switch the engine on, open the bonnet (the hood..) and see if you can locate the hissing - that'll probably be in the brake servo area.

If you don't know what a brake servo looks like here is a generic image:



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I have a brake problem on my 2005 GMC sierra


I need to know if the brake pedal gets tight or does the brakes get tight and slow vehicle down as if brakes are being applied.....If it is just the pedal getting tight and hard you have a vacuum Brake Power booster problem....If the brakes are locking slightly this could be a few different things......NEED MORE INFO..and Mileage....

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you mean you hear it WHEN you push pedal ? power booster could be going bad ! check allvacuum lines, sound good ? any trouble with brakes ? hard pedal ? tighten throttlebody mounting bolts ! gaskets do go bad, they get hard, dryout, become brittle, vacuum leak !!! replace vacuum lines if cracked, dryed out, etc.,, you can use a 3 to 4'-0 pc. of hose to listen hissing sounds where vacuum occurs to locate the leak .

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I have a 2004 Land cruiser and changed the right rear brake cyl and brake shoes . What is the proper procedure to bleed the rear brake system. Thank you for your help.


  1. Check the fluid level in the reservoir after bleeding each wheel. Add DOT3 fluid, if necessary.
  2. If the master cylinder was disassembled or if the reservoir becomes empty, bleed the air from the master cylinder as follows:
    1. Disconnect the brake lines from the master cylinder.
    2. Slowly depress the brake pedal and hold it.
    3. Block off the outlet plug with your finger, and release the brake pedal.
    4. Repeat 3 or 4 times.

  3. Bleed the brake starting with the one furthest from the reservoir and then the next furthest, etc.
  4. Depress the brake pedal several times, then loosen the bleeder plug with the pedal held down.
  5. At the point when fluid stops coming out, tighten the bleeder plug to 11 Nm (8 ft. lbs.), then release the brake pedal.
  6. Repeat until all the air in the fluid has been bled out.
  7. Repeat the procedure to bleed the air out of brake line for each wheel.
  8. Check the fluid level and add DOT3 fluid if necessary.

Aug 07, 2011 | 2004 Toyota Land Cruiser

1 Answer

When braking down from Highway Speed their is a vibration in the brake peddle. Also the stablizer message come on several time when I'm driving down the highway.


You have warped the rotors. Hard braking and a heavy foot on the brake pedal at stops will do that. See a dealer for the other.

May 17, 2011 | 2004 Cadillac CTS

1 Answer

What special tool is need to bleed brakes on 1999 gmc sierra? Had to replace all lines due to rust. I can only get the front driver side to bleed. The brake peddle is like steeping on steel. ...


You can actually bleed each caliper at the brake line connection to the caliper...you will need someone to depress the brake pedal, or you can borrow the auto bleed brake pedal tool from your local auto parts store...sounds like you can fix this yourself...the symptom says..."air in lines"...Hope this helps.

Feb 21, 2011 | 1999 GMC Sierra

1 Answer

The break lights wont work we have tried the fuzes!!!H-E-L-P


Hi,
Better check the brake switch, usually located under the steering column at the top of the brake pedal arm.
When you depress the brake pedal that switch will be activated, and when you let go it will be pressed by the brake arm.
Look for that switch, either it is disconnected or needs to be replace.
Hope that stops your problem!
Thanks for using Fixya!

Dec 10, 2010 | 1993 GMC Sierra K1500

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Check fuses first. If thats OK, could be a problem with the brake switch (down by the pedal) or the wiring.

Mar 26, 2010 | 2002 GMC Sierra

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95 gmc sierra 4X4 brake pedal very hard to push. every time touch brake pedal rpms go up 500, and it hisses on the inside of the cab. any solutions?


I think I would be looking at the vacuum booster for the brakes having a leak. Block off the vacuum line and try the brakes again. Make sure you have lots of room to stop. If the booster is bad then the pedal will still be hard but the RPM's and hissing should go away. Hope this helps.

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check at the top of the pedal, there is a micro switch that operates when you depress the pedal, this in turn operates the electric feed to the brake lights, this switch may be worn, or faulty...an easy but a little awkward fix

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