Page 3 - Caliper Reubild
P. 3
First install the inner seal, this seal simply seats into the groove of the caliper wall. This seal needs to be lubricated with either brake fluid or WD-
40 so the piston can be inserted. Again the piston rides on this seal not the wall of the cylinder.
This seal must be installed in the proper direction, the edge of the seal has a rounded edge and a sharp edge, the sharp edge goes down as
shown. Spray the seal so it easily slides on the piston. Slip the seal over the piston and slide it down until the edge of the seal sits in the outer
piston groove.
Now that the seal is sitting in the groove, pull the seal up to the top of the piston so it is flush, the seal will ride over its self. Now that the seal is
folded over its self make sure the seal is still sitting in the piston groove, smooth and flush. This serves as the outer seal and the piston dust
boot. Make sure to spray the piston with WD-40 or apply brake fluid to the piston so it will be lubricated to ride over the inner seal.
Place the piston in the caliper, it will be a snug fit. Once the piston reaches the first seal it will become much harder to push in, once past this
seal it will become a bit easier again. Then the piston reaches the second seal that is on the outside of the piston and part of the dust boot.
Again it will be hard to get the piston past this seal, but push down by hand as much as possible. The assembly has 2 seals, one in the cylinder
wall and one on the piston.