CD65

I'm looking for info on calipers on my '65 C2. The wheel cylinder pistons have stems on the back side, and the caliper bore has a part in the casting to accept and guide the stem. The car has the J50 Heavy duty brake option, but I don't know if J50 refers to the dual circuit master cylinder, the piloted calipers, or both. What year(s) were these used on, and how many cars had them?

Powershift

J50 is the Power Brake option. For 1965, 4044 cars had this, according to the Corvette Black Book.

The brake calipers you describe are the standard brake calipers for 1965. They are called the "first design" caliper. They have the piston guides. This changed for 1967.

Power brakes got the dual master cylinder.

J56 is the HD brake option used for racing...........which was offered in 1966 model year.

Larry

LB66383

Just in case you're not aware, that '65 dual master cylinder is very rare and very expensive to replace.

rongold

The easiest way to tell if a 65-67 has the H.D. brake option is to look at the calipers. If 1 pin holds the pads in place, you have standard brakes. If 2 pins hold the pads in place, you have the H.D. brake option. The H.D. brake option also included a pressure proportioning valve--The standard brake system had a simple distribution block with no pressure proportioning ability.


RON

Powershift

But OP said his car is a 1965, and the J56 option was not offered to the public until 1966 model year.

I guess he could have a 1-off (special factory racing) or a later conversion. But I doubt it.

Larry

NightshiftHD

One picture of the OPs brake caliper will tell us if they are 2-pin J56 brakes that have been added to his 65 or not. I suspect from his description they are standard J50 power brakes.