Reply With Quotei stand corrected, from what i gathered it was only noticeable between quick brakes in succession, numbers 10psi for drums and 2 psi for disk spring to mind.
There is no such valve. And you do need excessive pedal travel in a car where the brake shoes need adjusting. The return springs force the shoes back to the mechanical adjuster, residual fluid pressure is not enough to stop this. Unfortunately we have to take the drums off occationaly and adjust the shoes by hand.
If these is a residual pressure valve, it is designed into the rear brake pressure limiting valve. But, it doesn't work. The return springs always bring the shoes back to the mechanical adjuster as far as I know. If there was a valve, and it worked, you would not ever have to adjust your rear shoes. But unfortunately, we do.
I can't see how such a valve could be designed into the booster.
Anyway, in the case of the AE86, the booster is the same with either drum or disk brakes. The rear pressure limiting valve is different between disks and drums (in its rating, not it's design).
In regards to Nissan MC's, we need to get some photos happening of the different sorts.
i stand corrected, from what i gathered it was only noticeable between quick brakes in succession, numbers 10psi for drums and 2 psi for disk spring to mind.
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I could be wrong also. Worth looking into. If this residual pressure is a real thing, it would be in what I call the "rear brake pressure limiting valve" which others call the brake bias valve or proportioning valve.
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