Heck, that confused me on the re-read.

>> In the mid-1970s, Chrysler eliminated the rear brake residual pressure valve from the master cylinder. Its function was to prevent any air from sneaking into the system via the rear wheel cylinder cups. In its place, Chrysler substituted "expanders" in the rear wheel cylinders. (Expanders are dish-shaped steel inserts that exert outward pressure on the cups.) If you should decide to use a master cylinder from a 1975-up car, be sure you have the expanders in your rear wheel cylinders. For at least 20 years they have been universal in all replacement wheel cylinders and rebuild kits.

Lest I introduce more confusion, the car is a factory power brake, disk brake car. I'm not converting to disks per this article or anything like that.


The replacements are O'Riley house brand new cylinders for my car (73 Barracuda).