Gavin,
Run bigger rear wheel cylinders to increase the applied pressure (bigger
piston area generates more pressure) to the rear brake shoes and then use an
adjustable pressure limiter to prevent rear wheel lock up.
Our rules in Australia do not allow pressure limiters that can be adjusted
from the driving position. We achieve the desired result by experimenting
with wheel cylinder size. It's cheaper and just as effective. Wheel
cylinders are very cheap.
I just completed running Targa Tasmania in our race car and the brakes
worked fine even on the damp Targa stages. No scary rear wheel lock ups on
slippery mountain roads and we are running 7/8" cylinders instead of the
original 9/16".
Greg Burrowes
GM Holden Torana XU1 #50
Historic Touring Cars Australia
-----Original Message-----
From: owner-vintage-race@autox.team.net
[mailto:owner-vintage-race@autox.team.net] On Behalf Of Gavin Ivory
Sent: Saturday, 8 May 1999 5:49
To: 'vintage race list'
Subject: beginners tech question
I think my front disc brakes [new and upgraded] are locking-up way before
I'm getting full stopping power from my rear drums [shoes, cylinders in good
shape, with no air]. I'd like to install a brake prop valve, which I
understand gets spliced into the rear brake lines. Question is: Am I right
in thinking that the prop valve can only decrease the pressure to the rear
brakes, and if so, where do I install it if I want more fluid flowing to the
rear brakes. Put it on the front brake lines??
Thanks for the help,
Gavin Ivory [...still pining to get into vintage race ... but in the
meantime, learning all I can, under the car and at Mosport/Shannonville
driving schools]
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