You should try to verify that it's really the fronts locking up before
the rears before you install the prop valve. You're right in that the
valve only reduces the pressure in the line you install it in. Normally,
it's the rear that locks up first because under braking, the rear end
gets light. Since most of your stopping power comes from the front, you
should verify the problem before putting something in that will reduce
your stopping power in the front. If you can get confirmation that your
fronts are locking up, then by all means, put the valve in the front
circuit. The other option is changing the master cylinder sizes. Putting
a larger cylinder on the front circuit will have the same effect.
One way to verify lockup would be to have somebody videotape the car as
you mash the brakes. That's why I like open wheel cars. You can see the
wheels turn (or not) as you drive. ;=)
Gavin Ivory wrote:
>
> 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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