I have a 1967 Firebird that a pretty original car, but not restored. Early April build, 400, 4 sp, PS, front 4 piston calipers, and factory ac, naming a few things. My master cylinder started leaking, so I have no brakes. I was informed many years ago that my master cylinder is a pretty rare master. Casting P/N is 5461818, it's a 1 1/8 master. Does anyone know anything about these. This also NOT a power brake car that why I think the master is a little unique. My plan is to send it off to White Post Restoration for rebuild.
