Hi Uncle Joe,
Here's a quote from the Wilwood FAQ page:
Quote:
Q: When do I use a proportioning valve?
A: A proportioning valve is a pressure reduction device. It is typically installed in the rear brake line to reduce braking efficiency and compensate for premature wheel lockup; a result of incorrect front to rear brake bias. An adjustable proportioning valve permits incremental adjustments to fine tune brake bias.
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You need a place to stop from speed that has no, um, fixed barriers, if you know what I mean. If you lock the back tires under braking the car is unstable
What you need to do is to get the fronts to lock up just before the rears.
Regards,
Tom