brake bias valve?

  1. Regular Poster Joined: Apr 2009 welshpool Posts: 260 Black 1998 vtr R.I.P :( Red 1.1i saxo
    #1
    how do you go about adjusting them? if i brake harsh the rear locks up and shoots me left, right or straight. has a mind of its own lol.
    do i have to get a new one or can i adjust mine?
    thanks for any replies. x
  2. Newbie Joined: Oct 2009 York Posts: 1 Bmw coupe saxo vts
    #2
    Same problem on my vts,It has been in my workshop for 10 months while i did some work on it.It was fine before i stripped the interior and fitted gti6 brakes on the front.I have also fitted a brand new 4 port non ABS 23mm cylinder.I have fitted new disks and pads all round and have bled the system correctly.I took it for a run yesterday and when braking hard it seems the rear right is trying to lock up.If i apply the pedal gently it pulls up straight and seems ok.Ive put a few miles on it now and its still the same even after a second bleeding.Im thinking it could be because there is no weight in the car now and something needs adjusting.Bit annoying as i want to book a track day before the weather turns.Any advice would be appreciated.
  3. Frequent Poster Joined: Mar 2009 High Wycombe / Portsmouth / Canterbury Posts: 703 Mk1 Vtr & Mk2 Vtr
    #3
    i had the same problem, but to overcome it you need to adjust the bias via the spring. Get a set of mole grips on and clamp them as tight as you can on the thick spring part, then using a 10mm spanner do 4 turns anti clockwise on the screw, this will obviosuly give the spring more movement, therefore back to how the brakes should be. Allot of people forget to change this when lowering the car, which is why lots of people end of locking up at the rear and not the front.