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GMC brakes repair questions and answers

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  • Melissa
    Melissa - 2004 GMC Envoy - Brakes - 1/10/2015
    Changed brakes, rotors and calipers bleed the brakes and when started the car there was no brake
    Went to bleed them again and can not get any fluid. The cylinder is full of fluid.
    0 answer
  • Mr Beemer
    Mr Beemer - 1998 GMC Jimmy - Brakes - 12/30/2014
    Why did my brakes stop working
    there is no fluid leaks but emergency brake is not working and now both front and back brakes do not work
    • GT500Knights
      12/30/2014 GT500Knights
      As far as fluid leaks go, did you check the master cylinder? Check where it mounts to up against the booster. Should not be any leaks. And when you say brakes are not working do mean completely no braking at all when stepping on the brake pedal? Or do you have some braking power but have to use two feet to stop? If you answered yes to second question, it may be a brake booster issue.

      Did you check the fluid level? Check the reservoir. Even if you have had it topped off, you wil need the brake lines bled free of air.

      If no brake lines are leaking, check into leaky calipers or wheel cylinders. Though you may not have leaky brake lines, the calipers or wheel cylinders can leak enough to drain the master cylinder reservoir empty, and then suck air into the system.

      The parking brake not working can be due to broken or missing hardware in the rear brakes, a broken parking brake cable, or way under-adjusted drum brakes.
  • Hollis
    Hollis - 2003 GMC Sonoma - Brakes - 12/18/2014
    ABS Light and brake light comes on. How difficult to fix?
    Just replaced front brake pads
    • Teddy B
      12/18/2014 Teddy B
      You would have to know what the problem was before anyone
      could weigh in on the difficulty part

      If the front pads were replaced I would think someone put the
      problem in there from sloppy work
  • 812dobie420
    812dobie420 - 1998 GMC C1500 - Brakes - 12/10/2014
    Why doesnt my breaks fell spongy after changing rear end and wont let bleed break line
    Changed rear end from 3:73 to 3:42 does this matter
    • Teddy B
      12/10/2014 Teddy B
      How are you bleeding the brakes? Need two people to do that

      You have to do all four corners & any abs module

      Not supposed to feel spongy (you got it backwards)
      Teddy B
      12/10/2014 812dobie420
      Just dont have a peddle and light is on took to shop they said they couldnt fix it due to ratio being off
    • Teddy B
      12/10/2014 Teddy B
      They can bleed the brakes & resolve that issue
      You can do that yourself as well

      The front drive shaft you remove for now

      Then you rebuild/repair your old axle houseing or switch
      the gears to the new one
  • crouchmoney
    • clinton sampson
      12/7/2014 clinton sampson
      there is a control box under hood on firewall it was a recall but they said its too late but they have a replacement
  • mike
    mike - 2000 GMC Jimmy - Brakes - 12/2/2014
    What is the torque setting on 2000 Jimmy 4x4 front wheel bearing hub nut?
    I've heard numerous figures from 90-200 ft lbs. That's quite a wide range. I want to know correct answer…
    0 answer
  • mfree1
    mfree1 - 1997 GMC Sonoma - Brakes - 9/22/2014
    Brake light goes out if press brake hard
    When brake is pressed softly you can hear the first of three contact in brake switch make and brake lights come on. If you push harder you will hear another set of contacts click and brake lights go out. So anytime you press hard on the brake, the brake lights will ...
    • jdl
      9/22/2014 jdl
      At the moment, I suspect your brake switch. If the position of the brake switch is adjustable, I guess you could try adjusting?
  • Drew ingram
    Drew ingram - 2004 GMC Savana 3500 - Brakes - 9/20/2014
    Why such a violent shaking when going 45mph and hit the brakes
    Changed shoes , calipers and rotors to no avail
    • Wray's Auto Service
      Replace or machine front brake rotors should solve this issue.
    • Jimm
      9/20/2014 Jimm
      If the front brakes are OK - new pads, brake shoes and rotors, then check the front wheel bearings - be sure the bearing preload (tightness / looseness) when the rotors are installed is OK.
  • Nester Espiritu
    Nester Espiritu - 2007 GMC Savana 3500 - Brakes - 9/19/2014
    i am working on GMC savana ABS light is on but I cannot communicate with EBCM, all other modules has no communication problem and the only code I got is U1000, I have a power and ground to the EBCM, purple wire and brown wire are ok LB wire is also intact. DLC ...
  • Mike
    Mike - 2004 GMC Sierra 2500 - Brakes - 8/24/2014
    Brake calipers. Froze up. One at a time, but all 4
    Replaced LF caliper due to lock up, very shortly after RF caliper locked up. After replacement immediately Rear calipers locked up. Any suggestions would be appreciated. Thanks in advance.
    0 answer
  • ethanator
    ethanator - 1988 GMC K1500 - Brakes - 8/23/2014
    Since i don't got much room in the question box so i will put it all down in the additional details part
    I have a 1988 Gmc Sierra 1500 , it is lifted and has 35s . my brakes are soft. This is after i replaced the brake booster , and the master cylinder. Anyone have any ideas I don't know what to do next already put 200$ worth of parts on it , which didnt fix the ...
    • alex
      8/23/2014 alex
      is it posable one of the wheel cylinders got put in wrong. upside down would make it hold air and not bleed out. also are they soft or do they bleed down push soft and see if it slowly goes down. i have had bad new master cylinders. a weak line can swell with the pedal and give a soft feel also.
  • AutoMD Member
    AutoMD Member - 1995 GMC C1500 - Brakes - 8/17/2014
    Do I have a bad ABS unit?
    I have done some recent repairs to this truck. I had to run some new brake line also. I can bleed the brake system, and get good brake pressure. After sitting for a couple of hours, there is no brake pressure. You can get some of the pressure back by pumping the ...
    • alex
      8/17/2014 alex
      google the abs brake bleeding procedure try that first. your abs controller should throw a code if it fails you brake light that turns on when low on brake fluid will flash a code but what you described sould like you just need to bleed abs systome.
  • Drew ingram
    Drew ingram - 2004 GMC Savana 3500 - Brakes - 8/8/2014
    Why does this vehicle shake violently when brakes a re applied around 45mph
    New brake shoes, calipers and rotors were put on to no avail
  • olivetree
    olivetree - 2003 GMC Envoy - Brakes - 8/8/2014
    What is causing the brakes to apply themselves on turns only. (left or right)
    When making turns the brakes (what feels like the brakes) apply themselves. If at a very slow rate of a turn, it actually stops the vehicle. I've checked the front rotors, pads, brakes lines, & wheel wells for some sort of visible damage or rubbing & I have found ...
  • AutoMD Member
    AutoMD Member - 1998 GMC Savana 3500 - Brakes - 7/12/2014
    What is double flaring of a brake line ?
    Auto parts store told me to double flare the brake line . How do I do that , and why ?