Outside of Piston Here is the out side of the piston. This side presses against the back of the brake pad. Notice the section of the outer raised portion which has a flat cut in it. The flat must be oriented with respect to the travel of the disk. You want the piston oriented so the flat is at the leading edge of the disk rotational travel and perpendiculat to the disk at that point. A 20 degree wedge of light cardboard can be cut to use as a measuring tool. |
