BAF101A - 9 1/2 Rear Drum Brake Wheel Cylinder Pins, 4 pc Set. - Does Both Sides Applications 1964-72 A-body, , , , 1967-69 F-body, , 1968-74 X-body, , , , 1970-81 F-body, , 1973-77 A-body, , , , 1964-72 Elcamino, 73-77 Elcamino 1970-72 , 69-72 All other GM Cars with 9 1/2 rear drum brakes. This is a 4 pc set that includes the drum brake pins for both sides of the car. 9 1/2 brakes. This is the pins that go into the wheel cylinder and ride against the brake shoes they are always rusty from fluid and worn out from riding on the shoes. These pins push the shoes out every time you press the brakes. They are a must for the brakes to function correctly. If these are bent or missing the brakes will not work. This is exact reproduction of the originals featuring the correct thickness metal and plated finish. This is a Inline Tube exclusive concours quality exact reproduction, made to Nos specifications exactly the same as the originals. was used on both the 10 and 12 bolt rear ends and was considered the 9 1/2 GM Brakes. These pins were used on all the mid size A, F X-Body cars. The full size cars usually had the bigger 11 brakes so this is not for the 11 big brake cars.