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GMC brakes repair questions and answers

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  • AutoMD Member
    AutoMD Member - 1989 GMC K1500 - Brakes - 3/8/2014
    Manuel 5 speed. when ingaged in reverse, rear brakes seem to be dragging.
    My clutch needs replaced possible throw out bearing going could that cause any problems?
     
    • HouseCallAuto
      3/8/2014 HouseCallAuto
      Maybe the parking brake cable is stuck partially on because of the cable being rusted and siezed. Maybe the rear brake shoes were installed backwards
  • earl
    earl - 1996 GMC C1500 - Brakes - 2/25/2014
    Brake pedal goes to floor while braking
     
    • Team Associated
      3/21/2011 Team Associated
      Air in the brake system – bleed the system

      2. Grease or something on the brake shoes – remove the rear brakes and look for fluid on the shoes or drums

      3. Low (worn out) rear brake shoes, or a problem with the self adjusters in the rear brakes

      4. A problem with the master cylinder – replace master cylinder

      5. Brake fluid distribution problem – make sure there is enough brake fluid going to the rear brakes – check diverter valve
    • smagic69
      2/25/2014 smagic69
      check your brake fluid if its low fill it up to the max and then have someone hit the brake pedal for you so you can get underneath the truck and look where there could be a leak or it could be the brake booster but id go with the first one
  • jimt
    jimt - 1997 GMC C1500 - Brakes - 2/23/2014
    How do you tell if the master cylinder or the booster is bad on my 97gmc truck
    Pedal goes almost to the floor but stops
     
    • HouseCallAuto
      2/23/2014 HouseCallAuto
      Its likely caused by neither one. The brakes have to be checked, in particular the rear brakes if they are drum type brakes. Is the brake fluid level low?
  • AutoMD Member
    AutoMD Member - 2000 GMC Yukon XL 1500 - Brakes - 2/13/2014
    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, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - 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.
    • HouseCallAuto
      2/10/2014 HouseCallAuto
      It is not your brake pads or the rotors that need service, well at least not for what you have detailed here. What you are experiencing is known as "false abs activation" and is not uncommon to happen. The cause is one of your front abs wheel speed sensors is junk and the computer that activates your abs (that clicking in the pedal and the sinking pedal is active abs) thinks that your tire is hitting ice or is in a skid when you are not and this is happening because the sensor is throwing out signals that it is. It is giving the abs computer false info and the compter is then activating. You have to determine which front abs sensor is the cause and in a shop this is determined by one of two methods. Jack up each front tire one at a time and the wheel bearing that has end play is the bad one -HOWEVER - the hub bearing (which is acytually the abs sensor) does not have to have any feelable play so this test is not foolproof. The other way is to read fault codes on an abs capable scan tool and the code will identify the affected wheel, but you do not have this scanner and autozone will not check abs codes for you..got it? This type scan tool can be purchased online maybe for as cheap as $150 if you are still in this game...are you?
    • fazio auto
      2/13/2014 fazio auto
      Probably extended the caliper too far and one side may be locked up
  • AutoMD Member
    AutoMD Member - 2000 GMC Yukon XL 1500 - Brakes - 2/13/2014
    Why are my breaks going to the floor? Why is my rotor scrubbing?
    Breaks slipping. Abs light on. Grinding like metal to metal sounds. Loud rough clacking. Front drive side tire locking up.
     
    • 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, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - 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
    • fazio auto
      2/13/2014 fazio auto
      Would venture to guess that your calipers are fully extended and leaking brake fluid. You may need to repair your brakes with calipers, rotors and pads.
  • AutoMD Member
    AutoMD Member - 1992 GMC K1500 - Brakes - 2/11/2014
    Rear brakes lock up when backing. Completely.
    Ive tried adjusting the manual adjustment gear between the shoes. But to get it to stop its so far in, the parking brake goes to the floor with no brake holding. And the brake pedal goes way to far before grabing. The locking up is instant and solid, like something ...
     
    • HouseCallAuto
      2/10/2014 HouseCallAuto
      If this were my job I would replace the rear brake shoes no matter how good they look (unless you already did that) and I would assemble with new self-adjuster repair kits. Diofferent part # for left and right and lastly I would replace or resurface the drums and also confirm that the rear parking brake cables are retracting fully after releasing the parking brake and not over-adjusted. I know this might be replacing more than what is needed to solve it but I want to do this job once and not get married to it. I suspect that the locking up is mostly related to the parking brake - maybe a bad left or right cable that is not retracting fully. Also I will assume that the shoes are not installed reversed, primary (less material on shoe) goes to front and secondary (more material on shoe goes to rear. Also confirm that the wheel cylinders are not frozen by using any suitable tool and pushing inward on the wheel cylinder pistons a 1/4" or so and feel them move easily at all four points. Here is a provedure that I want to try to explain that is not written down anywhere. After the shoes are in place and you feel that the shoes are adjusted correct to the drum, you should be able to grab the bottoms of both the front and rear shoes and pivot the shoes forward and backward like a half inch or so and the point where the top of the shoes touches the anchor pin should remain in contact with the anchor pin (the anchor pin is the top most stantion / pin) as the shoes move forward and backward. if the shoes lift away from that anchor pin as soon as you start to pivot the shoes then the parking brake lever is not retracted fully which causes the parking brake crossbar to become a fulcrum point as you pivot the shoes. Ok that might be confusing but maybe not.
      HouseCallAuto
      2/11/2014 AutoMD Member
      Thats the best answer I've heard from anybody. Incld my mechanic. I went to buy the rebuild kit even before I read ur answer. The one they said went to my vehicle had a large adjustment wheel, (approx 1" dia). Mine is only slightly larger than the threaded rod it spins on ( approx 3/8"). Has this just been updated over time? Or maybe not the correct kit. Also the only rear pkng cables they show are for extended cab, mines a standard cab, are they the same? Your answer is awesome
    • John's Auto Repair
      2/10/2014 John's Auto Repair
      Are you sure brake shoes aren't contaminated with brake fluid or gear oil?
      John's Auto Repair
      2/10/2014 HouseCallAuto
      I forgot that. Yeah of course.
    • HouseCallAuto
      2/11/2014 HouseCallAuto
      So you need to buy the "self-adjuster repair kit" as it is called and apparently your truck has 10" brakes as opposed top the 11" brakes they gave you the kit for that was wrong. The 10" brake kit has a much smaller star wheel diameter like you described.
  • 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, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - 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, www.partsgeek.com, www.rockauto.com, www.discountautoparts.com, www.autopartswarehouse.com, www.jcwhitney.com - 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.
      Jimm
      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?
    None
     
    • 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 >> http://autorepair.about.com/library/faqs/bl863a.htm
  • 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