Quote:


I'd be willing to bet that's exactly what's going on. With no proportioning valve, front/rear pressure is equal, but the discs require much higher pressures to operate correctly.



Don't bet alot on it. The pressure differential is handled by the diameter of the piston in the caliper and the diameter of the wheel cylinder piston.

Do the math

http://www.school-for-champions.com/science/pressure.htm

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They say there is always the exception that proves the rule.
Don't be the exception.