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2003 Buick Rendezvous “ghostly brakes”

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 2003 Buick Rendezvous “ghostly brakes”

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  • #438716
    college mancollege man
    Moderator

      do you have any engine or brake lights on? if so
      post the codes

    Viewing 10 replies - 1 through 10 (of 10 total)
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    • #438726
      cnelson3225cnelson3225
      Participant

        I have had this problem for a while, have no idea what the deal is. What happens is when you are coasting into a corner, no brakes no gas, the antilock

        #438717
        rice400rice400
        Participant

          I agree with college man. First thing that comes to mind is a wheel speed sensor going funky on ya

          #438718
          cnelson3225cnelson3225
          Participant

            No lights, no codes. The reason we have traction control disabled is because it takes the liberty of activating when not needing, also making grinding noises.

            #438719
            MattMatt
            Participant

              Grinding noises?

              #438720
              rice400rice400
              Participant

                Dont confuse a grinding sounds with normal abs noise, abs tends to make sort of a grinding/whirring noise

                #438721
                djhughesdjhughes
                Participant

                  Sounds like a wheel speed sensor, maybe has a build up of debris on it, or the air gap is out of adjustment, but it seems like if that were the case the ABS would be applying the brakes to the affected wheel.

                  #438722
                  EricTheCarGuy 1EricTheCarGuy
                  Keymaster

                    It sounds like the ABS might be activating when you apply the brakes, this is actually quite common on GM vehicles in my experience and often it can be cleared up by cleaning the ABS sensors and tone rings, if not you probably have an ABS sensor starting to go and if you don’t have an ABS code to help you locate the failed part the best way to verify sensor operation is with a lab scope (and I know not everyone has access to one of those).

                    #438723
                    cnelson3225cnelson3225
                    Participant

                      Thanks for all the help, it is normal operation noises. Where can I find the before mentioned sensor so I can inspect them. This has been an ongoing problem and I fear it is making the brakes go a lot quicker, but I do have brakes for life so… This seems like it could be a costly fix if we were going to take it to the shop, but if it just a simple sensor that can save a ton of money.

                      #438724
                      techhotline7techhotline7
                      Participant

                        be sure to check the basics first. A bad wheel bearing often causes a wheel speed sensor to get funky readings.

                        #438725
                        MattMatt
                        Participant

                          When you pull the wheels, there will be an electrical connector going into the backside of the steering knuckle. It’s a hall effect sensor, and it uses a magnet that sends a signal everytime one of the ‘teeth’ on the tone ring go past it. The faster the speed of the wheel, the more signals, and it sends a sine wave pattern, similar to a radio wave looking thing, not really sure how else to explain it. If there is crud built up on the end of the sensor (it is magnetic) or the tone ring is damaged, it could give a bad signal, causing the PCM to think the wheel is slipping or locking up, and apply the ABS system during braking, if that makes sense.

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