'67 Corvette pb

[Bob Gasper]

I have a '67 Corvette with manual brakes and would like to convert to pb. Do I need to change the master cylinder and what size bore would it require? I have a power brake booster off of a '67 but the rod that goes into the master cylinder extends out quite a bit and it will not work with my current master cylinder because it pushes the plunger in about 1". Does it take a special master cylinder for the power brakes or is this pb booster incorect or is there an adjustment on the extruding rod that goes into the master cylinder? Is there a 1 year only for the master cylinder or does it go up to early 70's? Any help or pictures would be appreciated...

[Jack H.]

Re: '67 Corvette pb

There are prior threads on this subject in the archieves. They'll tell you that you need to match the interior brake peddle actuator rod to match your configuration as well (manual vs. pwr brakes).

[John H.]

Re: '67 Corvette pb

67's used the same master cylinder with or without J50 power brakes - casting #5455509, stamped "DC" at the front; this master cylinder had the deep-hole rear piston (due to its dual usage with manual brakes, which require the deep-hole piston for safety reasons), which is why the '67 booster has the "long" pushrod. This is one of the few applications where a power brake master cylinder uses the "deep" hole rear piston instead of the more commonly-used "shallow-hole" rear piston and short booster pushrod.