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Old July 3rd 2005, 20:59
flat flat is offline
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Join Date: Dec 2002
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A proportioning valve is silmilar to a pneumatic pressure regulator. Upto a certain pressure (the knee point) the prop valve lets the pressure increase at without regulation. When you reach the knee point, the pressure increase is regulated (smaller slope, graphically speaking). So, you can only reduce pressure with a prop valve.

If you have a vehicle where the rear brakes lock before the front, then you can add a prop valve to the rear circuit to balance the beast. If your front locks up first, then you have more problems. It is illegal in most places to regulate the front circuit of a braking system. Check your local laws before trying a prop valve in the front.

For a balanced vehicle, you want the fronts to lock up JUST (did I mention JUST) before the rears. Understeer is easier to control than oversteer.

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