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GMC brakes repair questions and answers

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  • CamperPuller
    CamperPuller - 2005 GMC Yukon Denali XL - Brakes - 4/19/2012
    Why does the Yukon hesitate when I step on the gas?
    I'm test driving a used Denali XL which I have the chance to purchase for a very good price. However, any time I attempt to accelerate from a complete stop it feels like the vehicle break engages and pulsates for about 5 seconds or so before I can go anywhere. ...
     
    • Jimm
      4/19/2012 Jimm
      Possible Causes of Engine Hesitation or Stumble:

      Dirty fuel injectors (cleaning the injectors often fixes this).
      Bad MAP (manifold absolute pressure) sensor
      Bad TPS (throttle position) sensor
      Bad or dirty MAF (mass airflow) sensor
      Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
      Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
      Bad gasoline (fuel contaminated with water or too much alcohol)

      Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

      Dirty or worn spark plugs
      Bad plug wires
      Weak ignition coil
      Wet plug wires
  • Elizabeth
    Elizabeth - 2005 GMC Jimmy - Brakes - 4/19/2012
    My breaks were replaced and they feel that they sticky when I use them
    The truck also makes a sound when driving slow
     
    0 answer
  • Fidel Flores
    Fidel Flores - 2001 GMC Sierra 1500 - Brakes - 4/5/2012
    Rear disc brake calipers are getting stuck and will not release pads, unless I push piston back.
    veh has 90k miles, everything original, first time replacing brake pads, took veh on Christmas trip, then sat in driveway for 2 months, getting ready to put new tires, checked brakes and noticed pads were very thin on rear. Replaced rear pads, drove a couple of ...
     
    • Bill
      3/22/2012 Bill
      You probably have air trapped in caliper piston cylinders and you need to bleed them.
      Bill
      3/26/2012 Fidel Flores
      I bled the brakes and they are still getting stuck.
    • HouseCallAuto
      3/22/2012 HouseCallAuto
      I have been doing brake jobs for many many years and have done lots of rear brake jobs on GM trucks. The one thing you did not mention that has to be mentioned is whether the caliper slides are moving freely. I always see that these pins, at least one on each side becomes frozen and causes the pads to drag. If you have no issue with these sliders and they move freely, then replace both rear calipers. But, I will tell you that if the pistons move back in freely with a c-clamp and the dust boot has no tears, then the caliper is good.
      HouseCallAuto
      3/26/2012 Fidel Flores
      Calipers move freely on slides, once I push the piston back, they slide freely on pins. any other suggestions, what puzzles me the most that both calipers are getting stuck at the same time
    • HouseCallAuto
      3/26/2012 HouseCallAuto
      I have never seen this happen in all my years to both rear calipers. Is it possible that maybe the parking brake cable is sticking and causing the parking brake shoes to drag? This seems kind of odd that I never saw this happen which really makes me think that the calipers really are not the cause. I guess all you can do at this point ois replace the calipers and see what happens. The master would not do this as it would affect the front brakes first. Both rear calipers cannot fail at the same time. What happens if while it is on jack stands and the calipers are stuck as you say, if you open the caliper bleed screw, does the caliper release?
      HouseCallAuto
      3/26/2012 Fidel Flores
      I opened the bleed screw and fluid leaks out, but calipers will not realease.
    • HouseCallAuto
      3/26/2012 HouseCallAuto
      Replace the calipers and see what happens. Something does not seem right.
      HouseCallAuto
      3/26/2012 Fidel Flores
      just replaced both calipers and it appears to be working ok,
      Thanks for all your advise.
    • Thefloyds2006
      4/5/2012 Thefloyds2006
      We are having the same problem with the front brakes on a 1994 GMC 1500. The passenger front caliper kept locking up and the wheel was getting very hot. So we replaced both pads, discs, rotors and calipers. The left front is still getting stuck. We have bled the brakes twice and are still having problems. Anybody have any other ideas. Thanks
      Thefloyds2006
      4/5/2012 HouseCallAuto
      Replace the brake hoses in the front.
  • Anna
    Anna - 1991 GMC C2500 - Brakes - 4/3/2012
    What is wrong with my driver side tail light
    if I use my blinkers it makes my driver side to stop working. Other times I use my blinker and it will come back on
     
    • yboy82
      4/1/2012 yboy82
      It is possible that there's a loose connection in your lightning system. The light switch operation and should be check. Also check for loose/damaged or corroded wires and electrical terminals, and repair as necessary.
    • cardoctor
      4/3/2012 cardoctor
      There is something called "continuity" in electricity. If one of your light is shorting out or burned out chances are you are going to have a problem. it shouldnt be hard to replace the bulbs.
  • Gil
     
    • Jay Giron
      12/30/2011 Jay Giron
      Try flushing the brake system.
    • don
      12/30/2011 don
      look over the front suspension.............
    • cardoctor
      4/3/2012 cardoctor
      Try to get the tire balance for 20 bucks.
  • auto doc
     
    • rick
      4/1/2012 rick
      get your rotors turned
    • HouseCallAuto
      4/1/2012 HouseCallAuto
      You have false ABS activation because of a bad front wheel speed sensor which on a Jimmy is a hub assembly. In order to find out which one you have to read the ABS codes that may be stored and if there is no codes you have to look at live ABS data on a shop grade scan tool.
  • Kevin
    Kevin - 1996 GMC K1500 - Brakes - 4/1/2012
    Inside Break Pads wear faster then outer pads
    On my 1996 gmc sierra the front inside break pads on both sides of the truck wear about three times faster then the outside pads
     
    • HouseCallAuto
      4/1/2012 HouseCallAuto
      Don't try to solve it, you won't. I see that often on GM trucks. As long as nothing is outwardly no good, no frozen caliper slides, then you live with it. I do not know the reason for it. How long do your brakes last though and how many miles before you have to change the pads?
      HouseCallAuto
      4/1/2012 Kevin
      I would say they last about 20 thousand miles
      HouseCallAuto
      4/1/2012 HouseCallAuto
      Could be worse. Try this part number next brake job >> ACDELCO Part # 171599
      HouseCallAuto
      4/1/2012 HouseCallAuto
      that is for the front
      HouseCallAuto
      4/2/2012 Kevin
      Yes for the the front.Thanks for the info
  • john
    john - 1996 GMC C1500 - Brakes - 3/31/2012
    How do you replace the emergency brake cable to the brake
    It's off
     
    • CVO
      3/31/2012 CVO
      See this Cables REMOVAL & INSTALLATION ADJUSTMENT

      Raise vehicle and support it with safety stands.
      Remove adjusting nut from equalizer.
      Remove retainer clip from rear portion of front cable at frame and from lever arm.
      Disconnect front brake cable from parking brake pedal or lever assemblies. Remove front brake cable. On some models, it may assist installation of new cable if a heavy cord is tied to other end of cable in order to guide new cable through proper routing.

      To install:
      Install cable by reversing removal procedure.
      Adjust parking brake.

      DISC BRAKES
      See Figure 2

      Release the parking brake.
      Raise the truck and support it with safety stands.
      Remove the cotter pin and the clevis pin from the brake lever and disconnect the clevis and lock nut from the end of the cable.

      Pull the cable and grommet out of the lower bracket. Unscrew the bracket bolt on the frame rail.
      Disconnect the end of the cable at the pedal lever, release the retaining fingers and remove the cable.
      Install the cable and check the parking brake adjustment.

      Center Cable
      Raise the vehicle on hoist.
      Remove the adjusting nut from the equalizer.
      Unhook the connector at each end and disengage the hooks and guides.
      Install the new cable by reversing the removal procedure.
      Adjust the parking brake.
      Apply the parking brake 3 times with heavy pressure and repeat adjustment.

      Rear cable.

      Raise the vehicle and support it on safety stands.
      Remove the rear wheel and brake drum.
      Loosen the adjusting nut at the equalizer.
      Disengage the rear cable at the connector.
      Bend the retainer fingers at the backing plate.
      Disengage the cable at the brake shoe operating lever.
      Install the new cable.
      Adjust the parking brake.

      For adjustment, see these instructions............ http://www.autozone.com/.../...rGuideContent.jsp
  • bgs1
    bgs1 - 2005 GMC Sierra 1500 - Brakes - 3/28/2012
    When the truck gets warm the breaks lock up and the truck will wil not release until the truck has cooled down
    this has been going on for 2 months but it is getting worse
     
    • yboy82
      3/28/2012 yboy82
      Try to check the condition of your brake caliper/s might be sticking. Any time a brake friction component comes into contact with a braking surface, heat is generated. If the brake shoe or brake pad generating that heat is not removed from contact with the brake drum or brake rotor for an adequate period of time between applications, heat is built up to an excessive level. This creates both a glaze upon the contact surfaces and a boiling condition of the fluid within the brake cylinder or caliper. The boiling increases the pressure exerted upon the braking surfaces further, leading to brake lockup; and, should the brakes be applied, the glazing which has occurred prevents normal friction action from slowing the vehicle as intended.
  • bgs1
     
    • yboy82
      3/28/2012 yboy82
      Try to check the condition of your brake caliper/s might be sticking. Any time a brake friction component comes into contact with a braking surface, heat is generated. If the brake shoe or brake pad generating that heat is not removed from contact with the brake drum or brake rotor for an adequate period of time between applications, heat is built up to an excessive level. This creates both a glaze upon the contact surfaces and a boiling condition of the fluid within the brake cylinder or caliper. The boiling increases the pressure exerted upon the braking surfaces further, leading to brake lockup; and, should the brakes be applied, the glazing which has occurred prevents normal friction action from slowing the vehicle as intended.
  • rick
    rick - 2007 GMC Sierra 1500 - Brakes - 3/28/2012
    IS THEIR PROBLEMS WITH BRAKES?
     
    • yboy82
      3/28/2012 yboy82
      There are 12 TSB's fr brake system for your vehicle, check out this link http://www.automd.com/recall-tsb/search/ to see it, just click the title of the TSB to see its summary.

      Technical Service Bulletins (TSB) are bulletins issued each year by car manufactures with up to date factory fixes to help service departments with common or difficult problems. On TSB’s the manufacturer has no obligation to notify customers or make the repair at no cost. A TSB may include updated part numbers and repair procedures and does not imply an extended warranty for a problem.
    • yboy82
      3/28/2012 yboy82
      You will notice that TSB online are just summary, if you want to obtain a full TSB report you can purpose it online or visit forums for your vehicle. All TSB's are submitted to NHTSA, as required by law, where they become a matter of public record and will also be provided to vehicle owners upon request.
  • Chris
    Chris - 2000 GMC Sonoma - Brakes - 3/25/2012
    My e-brake light is on and will not turn off.
    I put my e-brake on for the first time and the light on the dash stays on. The pedal is all the way up and brakes are disingaged fully.
     
    • HouseCallAuto
      3/25/2012 HouseCallAuto
      Check the level of brake fluid. There is a float in the master cyl reservoir that can turn the same light on. Also, pull the re4lease handle outward and try lifting the ebrake pedal up further.
  • geo
    geo - 2003 GMC Envoy - Brakes - 3/22/2012
    Brake lights stop working. Pedal switch has been replace still do not work
    Left and right brake lights stop working
     
    • EG9 K20A3
      3/21/2012 EG9 K20A3
      Are you sure your bulbs arent a dud? Fuse? If they are fine, then these vehicles are bad for the tail light circuit boards failing. With out knowing if the high mount light is on makes this a little more difficult so we need to see if there is power back there. With a test light to ground lets check the light blue wire at the connector for the each rear light with the key on and the brake on. If there is power then replace the tail lamp circuit boards. Check the connector going into each light, the light blue wire. Get a simple test light.


      EG9 K20A3
      3/21/2012 geo
      Thanks i will look into that
    • EG9 K20A3
      3/22/2012 EG9 K20A3
      Good luck and keep me posted
  • BDH
    BDH - 1994 GMC C1500 Suburban - Brakes - 3/18/2012
    How do you recenter brake combo valve after wheel cylinder replacement
     
    • Jimm
      3/18/2012 Jimm
      The brake proportioning valve is self-centering.Once the brakes are bled properly to remove all residual air, the proportioning valve centers or re-positions, based on the hydraulic pressure and relative balance in the system.
  • lisa
    lisa - 1995 GMC Jimmy - Brakes - 3/16/2012
    Brake lights not working
    all my lights work but when i brake my brake lights don't come on. the top brake light works but its just my two tail lights that aren't.
     
    • jdl
      3/16/2012 jdl
      So your lower brakes don't work? Usually the lower brake lites are wired through the turn signal switch. The high-mount brake lite isn't wired that way. Check for voltage at lower brake lites. Then you may need to check voltage to and from the turn signal switch for the lower brake lites.