Master cylinder for c8a

[Hanno Spoelstra]

Bonjour Serge,

As you noted the master cylinder you have has a smaller bore than the one normally fitted to the C8A. Thus, for the same amount of brake pedal pressure, a higher pressure will build up in the brake system. I think with a cylinder of 1" diameter you risk locking up the brakes when applying normal brake pedal pressure. I would say it would be better to fit a brake cylinder with the correct diameter of 1.25"

See the thread Replacement Chevrolet master cylinder for the thread Grant referred to.

Originally Posted by Grant Bowker

I can't find it right away bit there is at least one post (with photo) of a bracket made by Barry Churcher that fit between the original mount and a master cylinder similar to that mentioned by GJamo.
If you can find an original (even one that is pitted so that it is unusable) consider getting it sleeved with either stainless steel or brass. Many people have reported success (only a few report leakage between the sleeve and the original metal).