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If you have a corvette master cylinder for 4 wheel disc do you really need a proportioning or residual pressure valve and if you do why? I'm working on a SUPER cheap :sad: 4 wheel disc brake set up for My cousin.

We are using stock front calipers all around with brackets and rotors from speedway for the rear

Thanks
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4wldisc...

If the master cylinder is mounted below the calipers (floor mount hot rod) you need residual valves to prevent fluid drainback.

A rear brake proportioning valve is used to prevent rear wheel lockup by reducing rear brake pressure under hard braking. Not all cars have or need them. It depends on your individual setup. Using an adjustable valve in line to the rears is good insurance in case you need it. You can run it full open ('increase'/clockwise) if you don't need it.
 
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