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S4 Brake Assembly an ABS sensor - Description?

Discussion in 'A4/S4 forum(B5 Chassis)' started by SonicDeathMonkey3, Jun 20, 2008.

  1. SonicDeathMonkey3

    Jun 12, 2006
    Likes Received:
    My ABS light is off, but I am gettin the occasionl shudder though the brake pedal. I hve been told this could be a sensor needs cleaning.

    Not that I am going to do this myself, but does anyone have any pictures of the assembly so I can understand the problem?

    And what the hell are all those smilies??? Not noticed them before.
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  3. aragorn

    aragorn "Stick a V8 in it!"
    Staff Member Moderator VCDS Map User

    Jan 30, 2008
    Likes Received:
    the sensors are hall effect sensors and are mounted in the hub assy on the front and read off a toothed wheel on the CV joint, they can build up random bits of metal **** and this can effect their readings

    you should be able to pull the sensor out of the hub, clean the sensor and the hole with solvent (brake cleaner or similar) and put it back, but they can be damn tight to get out

    the rear ones on a fwd sit in the backing plate and read from a pickup wheel on the back of the disk. not sure about the quattro bit i'd imagine it'd be more like the fronts.

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