E46 brake rumble and traction control issue!
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  1. #1
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    E46 brake rumble and traction control issue!

    Hi Guy's
    This is my first post, so any help will be really appreciated. I bought an E46 330ci for a run around and noticed a grumbling sound under braking when the car was warm. The garage agreed to replace the front brakes and pads, but I am still getting a bad rumbling sound and vibration when the car warms up. The last couple of days under the first cold braking that I do it feels like the abs has activated, then tonight the traction control light comes on if I accelerate to hard and cuts the engine power until it feels grip is restored, weird thing is it isn't losing grip...

    As I said any Ideas will be welcome, as I really like the car and then at least I can suggest a few theories to my local mechanic and hopefully fix it.

    Many thanks

    Ian

  2. #2
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    e36coupe-328's Avatar
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    Does the steering wheel vibrate under braking?
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  3. #3
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    Hi
    No not really it is felt through the pedal and can hear it. A friend suggested it could be a rotor. Seems funny that the TC light is coming on as well.

    Best wishes
    Ian

  4. #4
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    e36coupe-328's Avatar
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    If it's only through the pedal it could be rears
    A bad wobble on the front you feel through the wheel as well

    Does speedo play up at all?
    This could all point to a playing up wheel speed sensor. Does the problem disappear if DSC is turned off in a safe space only to test
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  5. #5
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    Thanks for the suggestion, it makes sense as the car is obviously sensing something incorrect. I will turn of the dsc and finds a quiet road. Will let you know. I very much appreciate your help as new to bmw's so not used to their idiosyncrasies, my wife has a Renault for that!!!

  6. #6
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    You are right. with the dsc of it didn't do it and the rumble does seem to be at the rear so I reckon its new pads and disks and a look at the sensor. Once again many thanks. Ian

  7. #7
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    So, it could be either rear wheel sensor OR a problem with the reluctor rings on the drive shafts in addition to rear discs and pads - maybe


    With a 5 cable, old laptop and INPA you could have a passenger watch live data to see which wheel sensor / reluctor is misbehaving

    (And you could code options)
    Last edited by e36coupe-328; 13-05-2017 at 19:35.
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