Sharon,
Is this an under-the-floor master cylinder setup? Do you have the stock 3600 rear drums with Huck brakes, or did you swap in a different axle?
What kind of vacuum reading are you getting at idle?
Have you tested the booster- is it adjusted and functioning properly?
How much pedal travel do you have?
Did you install residual pressure valves (RPV) in the system? If so, where, and what psi rating(s)? A lot of new master cylinders do not have the integral RPV's in them anymore.....
There are varying opinions regarding the necessity of RPV's, but I put two (front & rear) in my 3600 system with an under-the-floor master cylinder, and it works really well. I also put them in my '63 4 wheel drum system with a firewall mounted power master cylinder, and it made a noticeable difference.
Every "corvette" style MC that I have seen that is used in most of these conversions does not have any RPV's in them.
Last edited by Norcal Dave; 11/09/2017 7:11 AM.
