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GMC brakes repair questions and answers

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323 Questions
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  • 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
    • yboy82
      3/28/2012 yboy82
      There are 12 TSB's fr brake system for your vehicle, check out this link 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.
  • HC
    HC - 2001 GMC Sierra 1500 - Brakes - 3/8/2012
    Brake Lights don't work
    I have replaced all the light bulbs, fuses and the brake light switch under brake pedal and still doesn't work
    • jdl
      3/6/2012 jdl
      Did you check for voltage, anywhere? Use a voltage tester. If you have voltage check for ground.
      3/6/2012 jdl
      Did you check fuses?
      3/10/2012 HC
      yes, I did!
    • CVO
      3/8/2012 CVO
      Inspect the electronic brake control module ( ebcm ). Try to do a reset by unplugging the wiring harness to the ebcm or inspect it for any sign of defects such as a fried components.

      See this FIG : Power, Ground, Serial Data - w/o Traction Assist(c) (2001)
      3/10/2012 HC
      3/10/2012 CVO
      Burned or shorted components.
  • leroy smith
    leroy smith - 2002 GMC Yukon Denali - Brakes - 3/1/2012
    Emergency brake cable popped .how do I go about replacing it...thxs...
    Emergency brake cable broke ..leaving pedal for emergency brake still on...
    • Spoon Sports
      3/1/2012 Spoon Sports
      i had my ebrake release cable snap. so for a week before i replaced it i just got under the dash and used me hand to push the mechanism that the release cable is attached too. try it, and be sure to hold the ebrake pedal so it doesnt fly up and hit you in the face. look under the car on the driver side and there should be a cable right behind where the running board would be, and it goes all the way to the back of the vehicle and see if it is tight or loose, if it is still tight you might have to cut it to take the e-brake off, if it is loose it means something is stuck inside the e-brake drum
  • Asfand
    Asfand - 2001 GMC Yukon - Brakes - 2/25/2012
    Abs and brake light contiously on although brakes and abs ok
    • yboy82
      2/25/2012 yboy82
      It is possible that your wheel speed sensor is faulty. Diagnose your vehicle with a scan tool/code reader to determine what the stored troublecode is.
  • skylar palmer
    skylar palmer - 1984 GMC S15 - Brakes - 2/21/2012
    Can someone pease awnser my quetion i neep help right away
    • Frank's Auto
      2/21/2012 Frank's Auto
      what is your question?
      Frank's Auto
      2/21/2012 skylar palmer
      my question is that i hve a 1984 gmc s15 pickup 2.8 L v6 and recently the starter went out in it so i went to picked up a new one and i did so i tryed taking the old one out well i forgot to take out the crossmember so after i finaly took it out one of the wires broke it was a round black rubber deal so i redid it with ring connectors and went i put the new starter in i forgot to tape it up so when i went to turn the key is started to smoke so i unplugged the battery now i dont get pow to igni
      Frank's Auto
      2/21/2012 skylar palmer
      and now i dont get power to the ignition it used to have this steady beep when i insert the key now i dont have any of that and when i turn the lights on the light in front of the truck and in the cab comes on and when i turn the steering wheel back and forth it makes this meter like sound clicking can you please help
      Frank's Auto
      2/21/2012 skylar palmer
      and my turn signals work when i hi the shifter thang when i turn the key the battery indicator dosent come on its like i dont hav any power the the ignition and turn signals
  • Jim Dobbins
    • Bill
      2/18/2012 Bill
      Check switch at upper part of brake pedal
      2/18/2012 Jim Dobbins
      can you send me a copy of how to get this out?
      2/18/2012 Bill
      Should be just a simple bracket
    • CVO
      2/18/2012 CVO
      Brake Light Switch

      Disconnect the negative battery cable.
      Disable the SIR system (if equipped).
      Remove the clip (R/V Series) or unclip the switch (C/K Series) and unplug the electrical connector from the brake light switch.
      Remove the switch.
      Installation is the reverse of removal.
  • Bryan
    Bryan - 1995 GMC Sonoma - Brakes - 2/18/2012
    No tailights or brakelights when headlights are on
    I just recently replaced my turn signal switch and had to rewire everything. Now I have no taillights or brake lights when headlights are on. Checked my ground and its getting power. Replaced all bulbs and still having trouble. Help!
    • jdl
      2/18/2012 jdl
      The ground shouldn't have power. I can't tell about your rewiring. My thought was a ground issue? The brown wire from the headlamp switch should carry voltage to the tail lamps, when head lamp switch is on. You can bypass the switch by using a jumper between the orange and brown wire. The orange wire is hot all the time.
      2/18/2012 jdl
  • gmaster
    gmaster - 1998 GMC Savana 2500 - Brakes - 2/17/2012
    Want to buy 2 rear ac delco brake drums but want to know which ones would fit my vehicle
    My van has 8 lugs with weight load of 8600lbs and 13 x 2-1/2 brakes. can anyone tell me which model to purchase? I at an AC Delco 18B147 but dont know if this would work for me. Can anyone help me? Thanks
    • HouseCallAuto
      2/17/2012 HouseCallAuto
      Yes, that part # is correct but ACDELCO also has an upgraded version @ part # 18B147A - the A at the end is for "Advantage" do not know specifically what the advantage is however the drum costs a little more but it's your call, either one is fine and they are both genuine ACDELCO parts. If you look at the inside door jam of your van you will see a decal with a n=bunch of three digit codes. This is a RPO decal Regular Production Options. You will likely see the code JD7 indicating the brake system your van was built with. The two parts numbers fit JD7 brake systems. Just confirm the JD7 on your decal.
  • OIF
    OIF - 2004 GMC Savana 1500 - Brakes - 2/7/2012
    Why does my van breaks bounce/vibrate/shake when I break.
    Have about 39000 miles on this van. I would say this started last summer and has gotten worst since. It fells like I have air in the breaks, but not like air when the pedal goes to the floor, the pedal just kind of bounces, but it stops the van, there is no ...
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