ABS malfunction

Discussion in 'VW Mk4 Jetta, Golf, New Beetle, Passat TDI forum' started by tditom, May 16, 2017.

  1. tditom

    tditom New Member

    Joined:
    Sep 28, 2009
    Messages:
    22
    Car:
    05 Passat TDI, 05 Beetle TDI, 99 Beetle TDI
    After changing master cylinder and after bleeding the system and running the output tests w/ VCDS now my brakes are locked. This is with no pressure on pedal. When checked w/ VCDS there is 65 bar pressure on brakes even without any pedal pressure. Is there something related to the ABS that can account for the retained pressure. The only way to relieve the pressure is to open the bleeder screws.
     
    Last edited by a moderator: May 16, 2017
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  2. chittychittybangbang

    chittychittybangbang Administrator

    Joined:
    May 23, 2007
    Messages:
    23,889
    Car:
    2006 Jetta TDI
    Location:
    CT
    Is this on the Passat? They were known for failed ABS pumps. I don't see why the output test would cause them to lock, or why it's still locked, but it sounds like perhaps something is broken in the ABS unit. You could look into a rebuild, or try other VCDS tests to see if cycling it will somehow release it.
     

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