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GMC brakes repair questions and answers

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322 Questions
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  • AutoMD Member
    AutoMD Member - 2000 GMC Yukon XL 1500 - Brakes - 2/10/2014
    Why is my rotor grinding? Why are my breaks going to the floor? Why is my driver side tire locking up?
    Grinding like metal to metal sounds. Clacking in driver side front tire. Abs light on. Breaks slipping
    • Jimm
      2/10/2014 Jimm
      Sounds like the front disc brake pads are worn down to metal-on-metal. If this is the case, then not only will the front brake pads need to be changed, then the brake rotor(s) will need to be changed as well.

      Remove the front wheels for a thorough inspection and to determine which replacement parts are needed.

      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities.
      In fact, they (RockAuto) list the front disc brake pads (axle set = both sides) from around $10.40, and the front brake rotors from around $22.70 (each) for your vehicle.
  • AutoMD Member
    AutoMD Member - 2003 GMC Envoy - Brakes - 1/30/2014
    How do i fix my brake light
    changed the brake light bulb but it is still not woking
    • Jimm
      1/30/2014 Jimm
      Need more information - is only the brake light on one side not working? Is the tail light and turn signal not working on that same side?
      Check the following items - tail light bulb socket, wiring connections - to the one light not working if that is the case.
      If both brake lights are not working, then check the bulb sockets, the wiring and connections common to both lights, and also check the brake light switch located on the brake pedal arm underneath the instrument panel.
      The parts are readily available from these many on-line sources,,,,, - to list only a few possibilities. For example, they (RockAuto) list the brake switch from around $10.50 and the light socket for the tail light from around $27.80 for your vehicle.
      1/30/2014 AutoMD Member
      the driver side brake light is not working. I changed the bulb but it still does not work. However when I turn the lights on the bulb lights up but when I step on the brake the bulb does not brighten
  • AutoMD Member
    AutoMD Member - 2004 GMC Envoy - Brakes - 1/29/2014
    Diver side brake light out
    replaced the bulb but still not working
    • HouseCallAuto
      1/29/2014 HouseCallAuto
      Replace the left rear bulb circuit board. Available from auto parts stores as DORMAN 923-011 around 20 bucks.
  • AutoMD Member
    AutoMD Member - 2002 GMC Envoy - Brakes - 1/29/2014
    How do I find out the labor rate for my zip code?
    • Jimm
      1/29/2014 Jimm
      The auto repair labor rate is not based on zip code nor geographical location. The repair labor rate is based on the individual repair shop labor rate - the rate per hour may, or may not be based on the repair industry standard times, such as Chilton or Motor. Within any given location or community the labor rate may vary greatly from shop to shop for the same work - so it pays to call around and compare.
  • AutoMD Member
    AutoMD Member - 2002 GMC Envoy - Brakes - 1/16/2014
    Brakes grinding, slow to stop, ABS
    115K miles. New brake pads, turned rotors, replaced ABS.....ABS light finally off after replacement but brakes are still slow to stop,.. grinding, pulsating. Any Ideas?
    • HouseCallAuto
      1/15/2014 HouseCallAuto
      I believe that you are describing what is known as "false abs activation" and this is normally caused by a bad front wheel speed sensor which on the Chevy truck is integral with the front wheel bearing assembly. This can be diagnosed if there is audible noise coming from one side or with a shop grade full function scan tool set up to read live abs sensor data while road testing the vehicle. This live data of each wheel speed sensor data will display the data in real time and will identify which sensor is the cause.
    • AutoMD Member
      1/16/2014 AutoMD Member
      Is the speed sensor located in the hub? forgot to mention I replaced the hub/wheel bearings, abs pump (as mentioned above), the universal shafts.
      AutoMD Member
      1/16/2014 HouseCallAuto
      Yes the sensor is part of the hub. You still have to diagnose this by scanner
  • AutoMD Member
    AutoMD Member - 1988 GMC C1500 - Brakes - 1/1/2014
    Is there a test for the speed sensor for the abs system at the tranny.
    the dash brake light is on. I checked connections at the abs near master cylinder, does not appear to be service brake related. rwal not working.
    • HouseCallAuto
      1/1/2014 HouseCallAuto
      The abs wheel speed sensor for the RWAL brakes is under the rear brake drums and not at the tranny. The sensor can be tested with an ohmmeter and also by reading data on a scanner equipped with abs software and / or you can flash out trouble codes easily by jumping two terminals, this should help at this page >>
  • AutoMD Member
    AutoMD Member - 1993 GMC C1500 - Brakes - 12/17/2013
    why does brake light stay on until u apply brake
    started when I had to slam brake when lady pulled out in front of me
    • HouseCallAuto
      12/17/2013 HouseCallAuto
      You mentioned nothing about the quality of the brake pedal. Did the pedal change what it feels like after the light came on or after your emergency braking that you did?
  • AutoMD Member
    AutoMD Member - 2005 GMC Envoy - Brakes - 11/9/2013
    No brakes even with engine running
    When driving thees no brakes also with engine in park the vehicle rolls.. eventually will stop 10 ft away. Replaced the front disc pads
    • HouseCallAuto
      11/9/2013 HouseCallAuto
      Details please. This is not enough to work with. Make your details so explicit it will make me feel like I am there. No generic / ambiguous terms like (no brakes). Tell me exactly what the brake pedal is doing. Does it go to the floor? Is the pedal a hard pedal but it does not go to the floor? When did this begin to happen, from one day normal and the next day "no brakes" ? I am guess ing that maybe what you are trying to describe by saying "no brakes" is really "no power assist" ?
  • rlhanson58
    rlhanson58 - 2008 GMC Acadia - Brakes - 11/3/2013
    How do i reset the abs warning light and the trraction control stablizing tract
    the alert lights keep coming on as well as the blinking sound while i am driving
    0 answer
  • AutoMD Member
    AutoMD Member - 2000 GMC Yukon - Brakes - 10/30/2013
    Air escaping from around the brake pedal linkage when brake pedal pushed. Vehicle very hard to stop.
    I have replaced rotors pads, shoes, drums, master cylinder and bled the lines and MC. Whenever I apply the brakes I hear a hissing sound which I have identified as air escaping from around the rod going through the floor board, presumably to the braking system. ...
    • HouseCallAuto
      10/30/2013 HouseCallAuto
      Replace the brake vacuum booster assembly. Not that hard to take out. Hardest part is using swivel soeckets and extensions and having to twist yourself to get under the dash to access the fasteners and rod.
  • Janet
    Janet - 2010 GMC Sierra 1500 - Brakes - 10/17/2013
    Back up light stays on or does not come on
    Passenger side back up light stays on all the time or does not come on at all. no other issues with vehicle
    0 answer
  • Janet
    Janet - 2010 GMC Sierra 1500 - Brakes - 10/17/2013
    Why does passenger side back up light not go out or not come on?
    the back up light will either stay on all the time or not come on at all, no other issues are occurring no warning lights or indicators are on
    0 answer
  • isom5539
    isom5539 - 1996 GMC K1500 - Brakes - 9/30/2013
    Why does my truck make a grinding sound that seems to be coming from the brakes?
    136k miles. Both rear wheel cylinders were blown out so I replaced the wheel cylinders, brake shoes, and the springs on both rear drum brakes. That didn't fix the grinding noise which happens when I am in reverse, first gear, and occasionally when I am in second and ...
    • jhepot
      9/30/2013 jhepot
      How about the bearing did you check. Or maybe something got bent when you werechanging and touching against the drum
    • HouseCallAuto
      9/30/2013 HouseCallAuto
      You need to add more detail to this, more info. What you said is just not enough for me.
  • isom5539
    isom5539 - 1996 GMC K1500 - Brakes - 9/30/2013
    Why does my truck have a grinding sound from the brakes when im in low gears?
    My truck makes a grinding sound when Im in first gear and occationally in second gear. My transmission fluid is clean. I replaced the wheel cylinders brake shoes and springs on both rear drum brakes but it still grinds. I know it is not my transmission and believe ...
    0 answer
  • cwidtow
    cwidtow - 2001 GMC Sierra 1500 - Brakes - 9/23/2013
    Why does ABS seem to activate at very slow speed and almost at complete stop.when not on slippery surface?
    mileage 95,000. ABS activation is intermitant. No warning lights are on. Calipers replaced. Some rusted brake lines replaced.
    • bear.1216
      9/23/2013 bear.1216
      This is common problem on these vehicles. The ABS will activate at slow speeds or creeping stops and it rolls thru stops. This is caused by faulty wheel speed sensor. The sensor usually will not give ABS code until it fails completely. You have to hook up diagnostic scan tool to read the live sensor data while test driving vehicle. When you make a slow stop or recreate the problem you will likely see the wheel speed of the bad sensor drop down to 0mph before the others. The sensor that drops out signals that the wheel is locked up and the ABS activates and releases pressure to that wheel. Because the ABS dumps the pressure to a working system you lose all braking power. Replace the bad sensor and it should be fixed. It is normally a front sensor that causes this.