69 Camaro brake booster
 

Looking at my neighbors brake booster on his 69 we both did not know what that part at the 5:00 oclock position on the brake booster. Any help would be appreciated.

Residual pressure valve for the rear drums if memory serves. You'd eliminate it if you went to discs.

Thanks for the quick response, mystery solved.:thankyou:

Well, I was wrong, it's called a metering or hold-off valve.

Good info here: http://www.camaros.org/brakevalve.shtml