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Old 02-20-2020, 12:08 PM   #2
SCOTI
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Join Date: Apr 2001
Location: DALLAS,TX
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Re: Master to proportioning valve question

As long as there's enough fluid to the brake piston/cylinder, which 'pot' it comes from is irrelevant. The unequal size reservoir (pot) are for allowing adequate fluid reserves when wear occurs @ the pads/rotors/shoes/drums.

The prop valve is intended for adjusting the brake bias. Normal bias is a 70(F)/30(R) split; or 70% of the braking force is on the front brakes. You don't want the rears locking up @ a different rate vs. the fronts. Adjustable prop valves allow just that. You can tune the bias so the rear lock-up is better matched to the front.

Tire diameter plays into the bias as well when it comes to OE set-ups.
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