CTLeeds
|
| posted on 27/12/18 at 01:55 PM |
|
|
Brake balance problem
Hi guys, I'm trying to work out a solution for my brake balance (front - rear) problem. I took the car to an old airfield to do some testing
prior to my IVA test on Jan 24th and I can't get the fronts to lock up before the rears. I adjusted the bias bar in the pedal box all the way to
maximize front braking and still the rears would lock first.
I think my issue is with the fact that half way through the build I made the decision to go with BMW rear calipers which have park brake motors in
them. These are from a 5 series whereas the fronts are 3 series and I suspect the 5 series units will have a larger piston in them to cope with extra
weight of a 5 series car.
I'm guessing a proportioning valve is not permissable for IVA so I'm looking for other options... I think one option would be to replace
the rear master cylinder with one with a larger bore and hence less pressure?
All suggestions welcomed as I'm running out of time!
Thanks in advance,
Chris
|
|
|
|
|
myke pocock
|
| posted on 27/12/18 at 03:18 PM |
|
|
I fitted a brake bias knob when I built mine and got it SVA'd. All I had to do was lock the knob in place once set. It can always be unlocked
after nudge nudge!!!! if required.
|
|
|
Bigboystoys
|
| posted on 27/12/18 at 04:56 PM |
|
|
I had exactly this problem when I fitted a full set of hi spec calipers to my car, in the end I just swapped the front and rear master cylinders
around as you say the bigger bore for the rear and this cured my problem. I then just used my brake balance bar to fine tune it.
|
|
|
CTLeeds
|
| posted on 28/12/18 at 08:41 PM |
|
|
Thanks for the replies. I think I'll give the bigger bore master cylinder a go and see how I get on.
Chris
|
|
|
