Damien,
There are a lot of possible reasons why you are getting rear lockup. The
scorpion callipers have a slightly larger piston bore than Skyline R31's so
I think a Sunny 13/16" Nabco master cylinder could suit your combo better
than a 3/4" Tokico which by internal design will supply a bit more bias to
the rear than the Sunny cylinder. Different brand cylinders with the same
bore size do give different bias if a prop valve is not fitted. The Nabco
13/16" is about right as it has slightly more front bias built in that a
Tokico 3/4" and the feel of the pedal is quite different for such a small
difference in bore. The Nabco has very little travel and feels quite firm
compared to the Tokico which is much more sudden for the same effort.
Stay away from Aussie cylinders (PBR etc) as they are crap and should never
have been fitted to Aussie Dattos, Japanese cylinders are recommended.
If you're not using the 180B prop valve with your 3/4" cylinder then that's
another option to consider, they're a bit of messing about to fit but they
do work as well as you can expect from a pre-set valve. Other things that
cause brake lockup on either end is the brake material you're using. eg If
you're using hard on the front and soft on the back then usually you can
induce rear lockup a lot easier.
It's not easy getting brake balance the way you like it with a not so
popular brake combo and is a topic discussed very regularly on this list so
you may wish to search the archives for some relevant info.
regards
Terry
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of damien cm
Sent: Friday, 6 April 2001 10:56
To: [EMAIL PROTECTED]
Subject: BALANCE
Hi all listers,
I have a brake question for ya all!! I have 200B Girlock brakes in the
front and scorpion discs and calipers in the rear. All four discs are
freshly machined and the pads are reasonably new. Calipers are in good
condition to the best of my knowledge. I have a brake booster which I think
is 180B (it was the only mod on the car when I bought it)
When I brake hard, the rear wheels lock up whilst the front are still in the
process of braking the vehicle. I HATE this as I have limited control and
feel that my brakes could be performing better. It also is destroying my
tyres due to the lock-up.
How do I solve this problem. I am aware that you get a 'bias' valve
installed on the car, but this is expensive and requires engineers
certificate. Could a different master cylinder be installed, say, from a
car with 4 wheel discs??? Because I have gone from drums to discs, I assume
that there is to much hydraulic pressure on my rear discs, therefore causing
them to lock up before the front. Do different master cylinders distribute
different amounts of pressure between front and rear than what a 180B
mastercylinder would????
IS there any good websites on this topic???
Any help much appreciated.
thanks, Damien.
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