The problem you are having is one I've seen many times on customer's GTO's when they have an aftermarket brake booster(repro) The problem is that the dimensions of the booster are a little off and you have to put a washer on each booster stud to shim the master
cylinder away from the booster a little. Usually one washer on each stud will do the trick. I
had to do this on my own GTO when I installed a repro booster. There is no adjustment on the auxiliary brake valve.
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