Intermittent brake squeak when pedal is not pressed, goes away when turning

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  • lcoleman
    Grease Monkey
    • Jan 2009
    • 331
    #1

    Intermittent brake squeak when pedal is not pressed, goes away when turning

    I have a brake squeal, present at random times when driving along. It seems to emanate from the RF wheel, and the strange thing is that it tends to disappear when loaded turning right, implying to me it's the outside pad (I think?) and that perhaps there is excessive play in the wheel bearing or the whole caliper just flexes.

    Braking hard seems to fix it, at least temporarily. The braking feel and performance is as good as it has ever been.

    -MC and booster are new as of ~10k miles ago
    -Fresh (junkyard, but not pitted) Girling calipers
    -Freshly rebuilt, might not have dust boots seated perfectly but I can't imagine that they're hanging
    -brass guide pin bushings, well-lubed
    -brand new OPP rotors and Jurid pads

    I need to flush the fluid as I've been running (and boiling) parts store stuff to make sure there are no leaks with the new calipers, but I don't see why that would matter. I'll try it anyway. I also coated all the pads liberally with syl-glide, and it doesn't seem to have helped. Perhaps I should try the expensive BMW grey paste?

    So...

    Assembly error?
    Need better anti-squeal paste?
    Messed up the caliper rebuild somehow?
    Wheel bearings shot?

    Thanks!:)
    Tags: None
    • CorvallisBMW
      Long Schlong Longhammer
      • Feb 2005
      • 13039
      #2
      Try swapping out the caliper for another one, but keep the pads. Or try different pads with the same caliper. Process of elimination...

        Comment

        • lcoleman
          Grease Monkey
          • Jan 2009
          • 331
          #3
          Forgot to mention, had previously thrown on a set of used pads with these newly rebuilt calipers to get on the road. Didn't run them long, but didn't have this issue. Thanks, though.

            Comment

            • jlevie
              R3V OG
              • Nov 2006
              • 13530
              #4
              What pads are you using? Will the squeak go away on light application of the brakes? Have you checked for a bent backing plate?
              The car makes it possible, but the driver makes it happen.
              Jim Levie, Huntsville, AL

                Comment

                • lcoleman
                  Grease Monkey
                  • Jan 2009
                  • 331
                  #5
                  Thanks for weighing in, Jim.

                  These are brand new Jurid pads with OPPparts rotors. Squeals a bit when pedal is pressed, but it's a more "normal" noise if that makes sense. Backing plates are long gone, and no shims on the back of the pads either. Perhaps I should add them?

                    Comment

                    • jlevie
                      R3V OG
                      • Nov 2006
                      • 13530
                      #6
                      Okay... Try a different brand of pads.
                      The car makes it possible, but the driver makes it happen.
                      Jim Levie, Huntsville, AL

                        Comment

                        • bimmerboy4444
                          Member
                          • Apr 2013
                          • 62
                          #7
                          my money is on the wheel bearing

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