Hi Guys,
I know that the 309 BA Master Cylinders were used on Factory Disc Brake 1969 Camaros (Z/28s) and Novas. Was this Master Cylinder ever used on a Chevelle?
Thank You for the help.

Yes, thats what my car has on it. I have always heard that the 'BA' was for a 69 Chevelle with disc brakes; was not aware it also applied to other 69 Chevy models with disc brakes.

BA is the chevelle master. US would be the camaro master. I beleive they are the same except for the code, both have a 1 and 1/8th bore.

US would be the camaro master.
:yes: Correct. http://www.camaros.org/suspen.shtml

Thank You Very Much for all of your help.