Master cylinders have been discussed on several occasions on this forum in the past. Often the discussion has been on the topic of residual pressure valves (check valves) located behind the tube seats in the outlet ports of the master cylinder body on cars with drum brakes and whether or not they should be there. Some of those discussions can be found at the following links:http://www.camaros.org/forum/index.php?topic=5189.0http://www.camaros.org/forum/index.php?topic=3428.0http://www.camaros.org/forum/index.php?topic=3657.0http://www.camaros.org/forum/index.php?topic=3541.0http://www.camaros.org/forum/index.php?topic=2938.0http://www.camaros.org/forum/index.php?topic=3674.0
Recently, I acquired a copy of "BRAKES, standard, disk and power"
which is a training program booklet that was used by Chevy in their training programs. The manual is #TP-53 and is dated 1969.
Attached to this post is a copy of the cover of the booklet. My '69 RS has power drum brakes. The master cylinder part number is 5460465 with a CT application code. This past weekend I rebuilt my master cylinder with a rebuild kit that I obtained from NAPA. The rebuild kit came with a new complete primary piston assembly, check valves and springs, and rubber cups for the secondary piston. As you will see in the following postings - it is the critical dimensions of the secondary piston that establish the application code.