GM master cylinder ID


Active Member
I have 2 master cylinders and have 1 rebuild kit. Does anyone know if either of these would have been an original from a 1970 skylark? They are in the same condition. 1 was from my skylark and the other from a wrecked 71 GS. Also, 1 had a silver piston, the other a gold one. I prefer to rebuild the original part. Thanks


A pic of the top side would tell use IF the car was equipped with drum brakes or disc brakes for the '71. Does your car have drum all the way around or disc front/drum rear????