I had to go out and look. The rotor size of the F body spindle is 11 inchs, the rotor size of the G body spindle is 10.5 inchs, I don't have a 67-72 A body rotor to measure but I believe it is also 10.5 inchs. The calipers for the 69-72 A body is the same as the F body calipers. The calipers for the G body-S1o are slightly smaller in physical size. The brake pads on the 69-72 disc brakes are the same size as the F body 73-77 A body brakes, the brake pads on the G body-S10 are smaller and have less surface area. The caliper piston size on the 69-72 A body and F body is 2.75 inchs and the caliper piston size on the G body-S10 is 2.375 inchs. As far as what master cylinder to use there are many choices, the holes on the fire wall of GM vehicles is the same for many different years. If you want more brake pressure use a master cylinder with a bigger piston. If you have a big cam and don't have much vacuumn you can use a master cylinder from a 1970 Firebird with manual disc brakes.
|