Brake Proportioning Valve Rebuild... - - Mazda RX7 Forum

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Brake Proportioning Valve Rebuild...


Old 12-08-18, 11:20 AM
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Brake Proportioning Valve Rebuild...

Hey guys.

I am trying to see if anyone has experience with the innards of the OEM brake proportioning valve.

I am swapping my GS drum brake car to GSL/GSL-SE rear end and already have a new GSL/-SE master cylinder.

I have a rear disc GSL prop. valve and took it apart to clean it up.

Everything looks good with the exception of the seal on the needle valve (anodized aluminum). The pics below kinda shows how there is a tiny chunk missing from it.

There are no rebuild kits available. The seal looks to be identical to the seal in teh early Miata prop. valves. I was thinking of buying a new Mazda OEM Miata valve to steal it from.

Another option is the installation of a Wilwood prop valve which is adjustable, but works different than the OEM component. There are some writeups on installing these on Rx7's and Miatas. Another option is to just retain my stock GS prop valve, many people report that it works just fine with the rear discs....

Good reference thread:
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