W221 320 CDI EPB electronic parking brake problem

Discussion in 'Wheels, Tyres, Brakes & Suspension' started by polababa, Oct 25, 2015.

  1. polababa

    polababa New Member

    Messages:
    3
    Joined:
    Oct 25, 2015
    Location:
    midlands
    Car:
    mercedes s class w221
    Hi chaps,

    Ive just got my W221 320 CDI 1 week ago and whenever I press the handbrake button, I hear an almighty racket from the back of the car (like gears grinding or slipping - and a horrible smell, which I reckon is carbon burning on the motor bushes) and it gives me an electronic handbrake error on my dash.

    I googled the problem, and learned that the motor malfunctioning is quite common on electronic handbrakes, so I got my new one yesterday and had it fitted. The mechanic found that my handbrake system was seized and managed to free it all nicely. The EPB module was checked when on the floor and it worked well... And when fitted it made the same noise and dash error when under tension from the system.
    So I am none the wiser, and I do not want to buy a second hand module for at least 500 quid, OUCH!.
    Any ideas?... I am now thinking it may be the gear box inside the EPB module doing something!.... and I couldn't find any repair kit for that like there is for the equivalent BMW's...

    I would really appreciate your thoughts and any solutions etc.

    Best Regards,

    PolaBaba.
     
  2. OP
    OP
    polababa

    polababa New Member

    Messages:
    3
    Joined:
    Oct 25, 2015
    Location:
    midlands
    Car:
    mercedes s class w221
    Hi chaps

    A quick update....

    It turned out to be a few things, the gears were gone inside, also the cable was too long, so it pulled the cable as far as it could, and it still would get any tension and would then start grinding the gears.

    So in all, I swapped out the module, and calibrated the cables, and its now working. I hope others find this useful.

    Regards.
     

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