1964-72 Chevrolet Chevelle, Pontiac, Lemans, Buick Skylark, Oldsmobile Cutlass Manual Disc or Manual Drum Master Cylinder Push Rod 1pc. This is the push rod that is on the back of the master cylinder of all manual disc or manual drum master cylinders. The rod is what pushes the back of the master cylinder to make the brakes work. If you are converting to manual disc brakes or just lost the rod this item will help you out.