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Old 07-02-2003, 07:01 AM
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rdorman rdorman is offline
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Join Date: Aug 2001
Location: columbus, Oh
Cobra Make, Engine: Unique 427 roadster with 351C-4B
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Default proportioning valve

Thanks for the kind words Roger! What works for one person and car combination may not for someone else. A lot can be done on paper but beyond that the only way is testing time.

For those who are looking to work out brake issues, find and buy Fred Puhn's Brake Handbook. None better that I have seen ever written. Even Carroll Smith said he would not right a brake book because he couldn't top Fred's book. Now THAT is saying something.

A proportioning valve, not to be confused with a metering valve, transmits full pressure to the rear brakes up to a certain point, the split point. After that point it reduces the amount of pressure to the rear brakes by a certain, and in the case of an adjustable proportioning valve, adjustable ratio.

The idea being the harder you are on the brakes the more weight transfer you have to the front wheels the less pressure the rear brakes can tolerate with out locking up. For street driven cars this is an advantage over a balance bar assembly that works on the assumption you are always braking at the max.

Rick
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