1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Brake question

Martin9400 Oct 18, 2018

  1. Martin9400

    Martin9400 New Member

    2
    0
    1
    Hi guys!

    I have a question regarding my B5, a little background:
    2.7T swap with RS4 B5 gearbox, axles and a S4 C4 rear diff, ratio at 4.11 all around.
    S4 B5 front brakes and RS4 B5 rear brakes, original 1.8TQ ABS unit.

    Now, my question is; does anybody here have an idea to why my brake pedal has a far travel to start the breaking? We're talking about halfway full travel before engaging.
    And when I get to around 5-10kph the pedal and noise suggests that the ABS system is kicking in.

    When the brakes do start engaging and when I really put pressure on it it does stop hard, of course it can be a bit wobbly because of the brake sizes. But this is expected. My problem is mainly pedal travel and the ABS kicking in unnecessarily!
    Any help and thoughts are much appreciated!
     
  2. Avatar

    Google AdSense Advertisement


  3. Dazzer

    Dazzer New Member

    23
    0
    1
    You don't sate whether your brake setup was working normally before this happened, or whether the brake setup is newly installed and this is happening directly after fitment.

    Also what do you mean by 'it can be a bit wobbly because of the brake sizes'?
     
  4. Martin9400

    Martin9400 New Member

    2
    0
    1
    I really don't know if the brakes were working normally before the change was done since I bought the car like this in April. Just recently got the conversion legalized through my local vehicle institution so I've started to use the car more.

    And by my statement I guess it's because of the brake sizes that the distribution of the breaking-force is a bit out of whack giving me more stopping power on the rear brakes than it should have, causing a bit of a lockup on the rear axle while braking hard.
     
  5. Dazzer

    Dazzer New Member

    23
    0
    1
    Not in UK then and your 'Vehicle Institution' doesn't need to sign off on your brake conversion?
    Can't really comment on the brake bias, you shouold do some research and work out if the rear bias is too much.
    Have you tried bleeding the system first?
     
  6. DieselJake

    DieselJake Well-Known Member VCDS Map User

    3,435
    970
    113
    Might sound silly but judging by your first post the brakes may just need bleeding again, braided brake lines may improve it a tiny bit as well and a decent brake fluid. The brake booster thing (forgot the name... actually that could even be the name I can't remember) can also cause a really useless brake feel if that goes which it may have.
     
  7. Phil_R

    Phil_R Member

    39
    10
    8
  8. aragorn

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

    18,725
    895
    113
    the brakes will just have air in them. The rear calipers especially are a pig to bleed. Sometimes driving around a bit then trying again will work. Other times you'll need to use a different method such as a vacuum bleeder.

    The ABS activation is probably a cracked ring or a bad or incorrectly positioned abs sensor
     

Share This Page