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Rotational Squeak from the front end - Drivetrain or brakes?

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  • Rotational Squeak from the front end - Drivetrain or brakes?

    HI everyone, I'm looking for some help to diagnose a drivetrain noise.

    https://youtu.be/wrwjKdXtAYE

    Stats:
    2012 KDJ150R Toyota Landcruiser Prado making noise
    1KDFTV engine, 5 speed Auto gearbox.
    Diff breathers installed by previous owner

    This noise only happens under certain conditions:
    - when load is being applied through the drive train on the flat (hard acceleration) or
    - when driving up hills

    The noise is rotational and appears to squeak approximately twice
    per tyre rotation (2:1 squeaks:turns)

    The noise sounds like a squeak but is hard to describe. Either rubber on steel, or a thin gauge steel being rubbed against a more solid metal. It does not appear to be a clearance issue between the brake disc cover and the wheel.

    Origin
    I first heard the noise following a river crossing in the high country at the bottom of a steep descent (Blue Rag Track, for those that can picture it). Having said that, I was not riding the brakes during the descent, relying on the compression instead. I don't remember how long I gave the brakes to cool before crossing.

    The noise started immediately on the (steep) ascent.

    The noise persisted on the 100-odd k return journey up the same track, but had gone completely by the end of the 100 kays to camp. It went quiet for about 1000 km then came back driving up the (steep) driveway one day. It has remained for 500 km and now makes the noise under heavy acceleration on the flat as well.

    Can't diagnose it!

    My ideas are either:
    - warped discs? (but they show no signs of increased wear, excessive heat, shudder under light or heavy braking or loss of braking power)
    - CV issues? (although if it was CV the rotation noise would be 1 per turn I guess?
    - Gearbox?
    -Transfer?
    -Diff?
    -Something else completely?

    Any ideas or help would be greatly appreciated. Cheers
    El_Capitan
    Lurker
    Last edited by El_Capitan; 08-08-2017, 10:41 PM.

  • #2
    Anything stuck between rotors n the brake dust cover?? Or bend brake dust cover n rubbing against the rotor internal side.
    Last edited by Skprado; 16-07-2017, 08:55 PM.
    Pearl white kakadu rolling on fuel hostage 18" with 285 60 18

    Comment


    • #3
      Originally posted by Skprado View Post
      Anything stuck between rotors n the brake dust cover?? Or bend brake dust cover n rubbing again rotor internal side.
      Thats a good thought, easier to inspect than anything internal.

      My cousin also thinks it may be caused by CV damage, considering the loud crack you can hear at the start of video 1.

      For reference, in video one i only used the accel. Traction control light flashed on the dash. In video two, I did a softer handbrake start and there was no TC light flash

      Comment


      • #4
        Originally posted by El_Capitan View Post
        Thats a good thought, easier to inspect than anything internal.

        My cousin also thinks it may be caused by CV damage, considering the loud crack you can hear at the start of video 1.

        For reference, in video one i only used the accel. Traction control light flashed on the dash. In video two, I did a softer handbrake start and there was no TC light flash
        sounds like what ever it is, it is spinning quicker than your road speed

        pulleys / tensioners?
        Last edited by GEEEXL; 17-07-2017, 11:04 AM.

        Comment


        • #5
          Originally posted by GEEEXL View Post
          sounds like what ever it is, it is spinning quicker than your road speed

          pulleys / tensioners?
          I'm not ruling it out yet but I don't think so.
          It doesn't make noise when I rev it stationary. Unlike this video: https://youtu.be/mTuCq0EwPsw
          The noise seems only to occur while the wheels are turning, approx 2 squeaks per rotation.
          El_Capitan
          Lurker
          Last edited by El_Capitan; 17-07-2017, 05:56 PM.

          Comment


          • #6
            Update. Mechanic has diagnosed it as "Probably CV joint". The loud clunk on initial load and smaller clunks under acceleration lead him to that conclusion. The squeak he thinks is probably due to the disc rubbing against the disc backing plate once the hub is torqued out of position due to the broken CV.

            She goes in for a tear down on Monday. More to follow then.

            Comment


            • #7
              Update. Problem solved.

              The clunk was caused by a broken front left drive shaft. Damage was visible as soon as it went up on the hoist (no photos sorry).
              The squeak was a result of something (probably the rotor) rubbing against the brake backing plate

              The broken shaft was replaced. No noise.

              Comment

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