71ProjectJunk
Well-known member
- Joined
- Jul 27, 2021
- Messages
- 892
- Reaction score
- 656
- Location
- East Texas
- My Car
- 1971 Mustang Mach 1 M code 351 4 speed
On the saga of the wrong parts. I keep buying parts and I keep getting the incorrect parts. Just happened with some U-joints, just updated a thread on that, and now also with rear wheel cylinders. Basic info so you can at least start navigating the rear wheel cylinder saga:
1- 6 cylinder and 302 cars got 7/8" wheel cylinders, 351 and 429 cars got 29/32" wheel cylinders. You cannot get this wrong as your cars rear brakes will not work correctly with the incorrect size wheel cylinders. Basically the 10x1 3/4" brakes (6 cyl and 302) use the 7/8" wheel cylinders, and the 10x2" brakes (351 and 429) use the 29/32" size. This is pretty simple. Here comes the mess in #2.
2- Napa, Cj Pony, and a host of other sellers list a 29/32" wheel cylinder, but they claim that there is a left side and a right side cylinder. So, I ordered one right side and one left side cylinder. Well.... My car uses 2 left (drivers) side cylinders...
So, for a 1971 car with 351 or larger engine, 10x2" rear drums, you need two left (drivers side) 29/32" wheel cylinders.
1- 6 cylinder and 302 cars got 7/8" wheel cylinders, 351 and 429 cars got 29/32" wheel cylinders. You cannot get this wrong as your cars rear brakes will not work correctly with the incorrect size wheel cylinders. Basically the 10x1 3/4" brakes (6 cyl and 302) use the 7/8" wheel cylinders, and the 10x2" brakes (351 and 429) use the 29/32" size. This is pretty simple. Here comes the mess in #2.
2- Napa, Cj Pony, and a host of other sellers list a 29/32" wheel cylinder, but they claim that there is a left side and a right side cylinder. So, I ordered one right side and one left side cylinder. Well.... My car uses 2 left (drivers) side cylinders...
So, for a 1971 car with 351 or larger engine, 10x2" rear drums, you need two left (drivers side) 29/32" wheel cylinders.