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Thread: Weird Brake Vibration on E 46 Please Help!

  1. #1
    Join Date
    May 2014
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    El Paso, TX
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    2001 BMW 330xi

    Weird Brake Vibration on E 46 Please Help!

    Hey Forum Brake guys

    I have a weird brake problem on my 330xi. It is come and go brake vibrations. I can start out with brakes operating normally, then going down the road I step on the brakes and thy vibrate whether I am going fast or slow, but the faster I go the worse the vibration. Then, after I brake hard the problem goes away. I know it sounds like a sticky caliper problem, but I can't find any visual evidence to support that. I checked the calipers and they appear to be in good shape. The rotors and pads are about a year old. I recently bled the brakes (not pressure bled), but the pedal is firm. I will measure the run out on the rotors, but the come and go nature of the problem has me baffled.

    Would someone please comment? I did post a similar message a few weeks ago, but got no response. If I broke the site rules, I apologize, but I want some help before I go out and start replacing calipers, rotors and pads.

    Thanks

  2. #2
    Pelican Parts's Avatar
    Pelican Parts is offline Senior Member Supporting Vendor
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    '02 E39 Touring
    Did you check the rotors themselves? Sounds like you may have some warped ones.


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  3. #3
    Join Date
    May 2014
    Location
    El Paso, TX
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    28
    My Cars
    2001 BMW 330xi
    Sorry for the delay in sending a reply to your response. The warped rotor is a good thought, but the ones I have are less than 6 months old and a rudimentary gap measurement test showed no change as the rotor went around. Could it be something as simple as needing a rebuild kit? I feel that because the problem is intermittent and it seems to diminish as I brake harder that it could be a sticky caliper. I suppose it could be a wheel bearing too, but I have no problems at speed.

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