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GMC brakes repair questions and answers

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  • bamlhaley
    bamlhaley - 1996 GMC Sonoma - Brakes - 11/10/2012
    Turn signals work until i hit the brake pedal
    • atecmak
      11/10/2012 atecmak
      You have an apparent short to ground issue.
  • wilsonsherri20
    wilsonsherri20 - 1993 GMC C1500 - Brakes - 11/9/2012
    My brake fluid is leaking out the back right tire
    • Jason
      11/9/2012 Jason
      Sounds like you'll need a rear brake job done including wheel cylinders (drum brakes).
  • donaldjamison31
    0 answer
  • duckhunters84
    duckhunters84 - 1991 GMC Sonoma - Brakes - 10/28/2012
    Why brake light wont work and running brake light (tailgate lights wont work)
    brake light wont come on when press pedal, when i turn headlight on the running light wont come on, when i turn signal on it become 4 way flasher, i have replaced all lightbulbs and check fuse and check switch.. when i put it in rev the rev white light dont come on ...
    0 answer
  • Steve Hart
    Steve Hart - 2001 GMC Yukon XL 1500 - Brakes - 10/18/2012
    Randomly my ABS warning light comes on and may go off if I stop and restart the car. It triggers the brake warning lt.
    150,000 miles and well maintained. Runs like new. No brake problems. All new brakes, rotors, etc. Driving with the ABS light on triggers the brake warning light. That used to make gages go wild and the truck lose all power, but it stopped doing that. Runs fine now. ...
    • graham-ss
      2/15/2012 graham-ss
      wheel speed senser sounds like a bad wire to one of them it will do that the truck goes into a safe mode like setting so you couse an acident ask your mechanics if they have a saner that can graph the sensers and go for a drive
      2/16/2012 Steve Hart
      Thanks, Graham. Sorry I didn't get back to you first because you hit it on the head when you said "safe mode". That's what happened the first time this showed up. The truck wouldn't drive over 5 MPH twice, when my wife was miles from home. That began the oddyssey to solve the Sherlock Holmes mystery. I'm going back to an old car with a distributor and a carburetor and nothing electric except an alternator, ignition and lights. Saving on gas isn't worth getting robbed monthly.
    • Spoon Sports
      2/15/2012 Spoon Sports
      "No brake problems. All new brakes, rotors, etc. "- Yeah well, the light is for sensors and not parts so im thinking during the process oif installing those parts, the ABS sensor might have been plugged or whatnot.

      When the ABS light is ON the usuall suspects are

      1. ABS speed sensor
      2. ABS module (unlikely)

      Your ABS has been disabled but you can still brake old school style. I THINK There is a service bulletin out for this problem. Apparently many of the ABS codes are because of a bad ground. GM makes a grounding kit, it's a special nut and bolt for 7 bucks. My dealer wanted to do the same, until I showed them the bulletin.

      Spoon Sports
      2/15/2012 Steve Hart
      Thanks guys. I was told that it might be a wheel speed sensor, but the supposedly trained mechanic couldn't say for sure and I wasn't going to let him start any trial and error bologna at my expense. Previously he had supposedly tracked the problem to a sensor on the power takeoff and changed it. That did nothing. Then another mechanic said the same thing and checked the first guy's work. He said the first guy never changed the sensor, so he did it. Same old problem and more wasted of time and $
    • Steve Hart
      2/15/2012 Steve Hart
      When it caused the gages to go wild the first clue was the speedometer needle bouncing up and down right after the red brake warning light came on, regardless of how long the ABS light had been on, so a wheel speed sensor really does sound like the culprit.
    • Spoon Sports
      2/15/2012 Spoon Sports
      Good luck chief
    • HouseCallAuto
      2/16/2012 HouseCallAuto
      Faulty EBCM is most common cause - Electronic Brake Control Module but someone has to check ABS module for codes with shop grade scan tool. These codes are C codes, not P codes. Look for a C0265 fault code and if present replace the EBCM.
      2/16/2012 Steve Hart
      That's another trial and error thing this one mechanic tried to pull on me. He's supposed to be such an expert and at one point he said I might need to replace the brake computer and that they cost about $1000 just for the part, but he couldn't say for sure if that's where the problem was so he doesn't have the proper diagniostic equipment. Mr. trial and error tries to pull another fast one. Isn't checking the checking the wheel speed sensors a total nightmare?
      2/16/2012 Steve Hart
      Is that reality show going to be called "House Call Auto"? I love DIY shows and I've been working on cars for 45 years and still do most of my own work..... until some electronic nightmare screws me up. I almost never took a car to a mechanic until I got old and all busted up, but I still get out there and fight with them a lot. My family has a whole fleet and I have to do a lot of the work and all the figuring out.
      2/17/2012 Steve Hart
      Last night I remembered that one previous mechanic had checked the wheel speed sensor and said the corrosion fix repair had already been done. My wife remembered that too, so I'm just going to replace EBCM. I see they aren't anywhere near $1,000 and I can have mine rebuilt for only $45, so that was another major auto mechanic scam avoided. The highest price I saw on eBay was a little over $300 new. This is exactly why I have personally done every repair I could possibly do, since 1967.
    • joeP
      2/16/2012 joeP
      I had a problem that sounds a little like yours, except it was on a 1994 mercury villager. a code is being stored when light comes on. however when engine is turned off and again operated the light will come on again after a while. the code for this problem directed me to the left rear sensor or specific wire or connector. this van is equipped with bosch antilock braking system. brakes are monitored in milliseconds continuously. So they can react immediately when needed. Therefore it only takes a minor poor connection to cause a problem. On this problem power steering fluid had leaked on a connector under the hood. Solution: locate and disconnect and clean with a proper solvent for such purposes. if you have a code reader you can erase code(s) after repair. hope this helps.
      2/16/2012 Steve Hart
      Thanks for the info, Joe. I think House Call Auto hit the nail right on the head. If it isn't the computer, which I'm pretty sure it is, I'll have to mess with the wheel speed sensors. At least now I know what to have diagnosed and it's a simple thing to just ask who can diagnose the EBCM before I pay some quack. If there's a code it's in a different computer that I can't access with my peon scan tool.
      2/16/2012 HouseCallAuto
      You can by a fairly inexpensive ABS code reader, maybe a hundred or two. Will still be cheaper than a shop overall and I can coach you through the finishing touches.
    • Larry Koltnow
      10/18/2012 Larry Koltnow
      Steve, I have a 2000 Yukon XL, and recently (intermittently, but lately on a daily basis), my brake and ABS warning lights came on at the same time....everything drove and braked fine, but lights wouldn't go out until I stopped and restarted engine. Sometimes they went out, sometimes not. The mechanics said it was a ground problem, but turned out it wasn't. Then they said it must be the module ($1200 plus labor)...I said no, and left the GMC agency and went to another mechanic. My brakes and rotors were very worn, so he put on all new ones, and the lights have not come on in a couple of days. It's possible that the lights came on to let me know my brakes needed work, but perhaps not. Since you say you have all new stuff already, you probably have a different issue, but I had luck once long ago by calling GMC in Detroit and having someone check out all memos in their more extensive manuals and's possible my problem is not solved, so let me know if you come up with anything. I'm going to call GMC if the issue continues....Best of luck, Larry
  • Joseph
  • george
    • olds40316mm
      10/6/2012 olds40316mm
      Try adjusting the rear brakes (adjusters are probably stick) that will get you a full pedal But as for your pedel bleeding down makes me think your replacement master cylinder is still at fault
  • david
    david - 2004 GMC Yukon - Brakes - 10/5/2012
    What is c0298 and c0265 codes
    Abs light comes on
    • felplay auto repair.
      c0265 it has to do with the ground on the frame.. All these look to involve wiring problem as the modulo..

    • HouseCallAuto
      10/5/2012 HouseCallAuto
      I cannot tell you a cause because the cause is not clear because you have both these codes present at the same time.

      For the C0298 >>

      1. At the Electronic Brake Traction Control Module (EBTCM) disconnect and check for voltage on the Orange/Black wire at pin B4. Turn the key on, engine off. The expected voltage is 5.0 volts.

      2. If 5 volts are present raise the Underhood Electrical Center (UHEC). Inspect the wiring for rodent damage.

      3. If no problem is found, verify the Tan/Black wire is good to the Green connector at the PCM on pin 5. 5 volts should be present there also.

      4. If not, locate and repair the open circuit in the Tan/Black wire.

      For the C0265 >>

      1. Verify 12 volts power on the Red wire, and ground on the Black wire, at the two pin connector to the Electronic Brake Control Module (EBCM).

      2. Disconnect the plug from the bottom of the EBCM going to the motor. Then power and ground those wires and verify the motor runs and how it sounds.

      3. If the motor runs and sounds fine, then the EBCM has to be replaced.

      4. If the motor does not run, replace the motor and retest to see if the code returns.

      5. Calibrate the tire size using the scanner after replacing the EBCM. If replacement is necessary, you will have to have someone program the tire size into it using a shop grade professional scan tool.

      The pump motor relay is built internally of the EBCM and can only be serviced as the whole EBCM. Also note that if the pump motor is bad, it can damage the relay from too much current draw.

      Note; the EBCM and the EBTCM are two different components. I believe that these two codes have the same cause as there are shared circuitry between them relating to serial data communication. When you find the cause for one it willolve the other as well. Good luck, thats all I got.
      10/6/2012 josh
      The EBCM and EBTCM are one in the same, and only one can exist on a vehicle at a time. EBCM= electronic brake control module, EBTCM- electronic brake and traction control module. It will have one or the other depending on whether or not it has traction control. Now the EBCM/EBTCM and the BPMV are two different components! Note: the new module will need software programming as well as tire size configuration.
  • tomstud408
    tomstud408 - 2000 GMC Savana 3500 - Brakes - 9/29/2012
    When bleeding brake lines....
    When bleeding brake lines do you hold down the brake pedal with bleeder open as air escapes, then once steady stream of brake fluid appears close bleeder and then release brake pedal? This would require two people. Just a yes or no answer would be great. Thanks for ...
  • tomstud408
    tomstud408 - 2000 GMC Savana 3500 - Brakes - 9/28/2012
    I repaired a wrought section of 3/16 brakeline now I need to bleed it, how do I properly bleed all air from brake lines?
    I just don't know the steps to be taken. I'm a licensed plumber this is my work van I make all repairs myself so I know the mechanics of the vehicle pretty well but this is a first for me. Thanks I appreciate the help
  • Rich D
    Rich D - 2006 GMC Envoy - Brakes - 9/9/2012
    There is a wabble in the front end when braking at high speed. New brakes,rotors,tires and alignment. Still wabbling !
    I felt the wabble so I got the new brakes and rotors. Needed new tires, and had a bad tie rod so got that fixed and an alignment. Still have the wabble.
    • mikes auto specialty/ mike baker
      check stabilizer arms and bushings and inner and outer tyrods both upper and lower
      mikes auto specialty/ mike baker
      8/20/2012 Rich D
      Had the lower passenger tie rod replaced, they supposedly checked the entire suspension. But you can never know. Thanks!!
    • HouseCallAuto
      8/19/2012 HouseCallAuto
      If the *shudder* or *wobble* only happens when braking and it shakes the steer wheel, then your cause is rotors in the front or the surface that the rotors lay against is not clean and may be binding the rotor at the hub center, too snug a fit because of rotors out of tolerance for center hole size combined with rust buildup at the wheel hub. Or, the rotors you got are defective. It happens. i just did brakes and rotors fpr the same reason on a 2010 Town and Country. After installing the rotors It seemed worse. It was not my imagination. A second set of rotors cured the problem.
      9/1/2012 joe
      right on HouseCallAuto! can't say it any better
    • AutoMe
      9/9/2012 AutoMe
      check to be sure that you do not have a stuck piston in a calliper. Be sure that both brake pads are moving freely. The wear on your rotors should be the same on inner and outer surfaces, both right and left. If one is stuck it would distort the rotor, resulting in the shrudder you feel.
  • Rod
    Rod - 2001 GMC Sonoma - Brakes - 9/8/2012
    Abs light on followed by red brake light
    Intermittent problem first abs amber light then red brake light
    • Brandon
      9/8/2012 Brandon
      I had a similar issue with my ABS light coming on mainly when I started up then slowly flicker away but would pop on intermittently. After ruling out worn pads or bad wheel sensors I ended replacing the abs module and my ABS light has not come back on since. The ABS module new from the dealer is was nearly $1000 I bought a used one for $130 from ebay