Brand: Wilwood Engineering
These square-section piston seals fit all Wilwood calipers with 1.38" (1 3/8") pistons. They can also be used in Outlaw brand calipers. Sold in sets of four seals, enough for one 4-piston caliper.
Note 1: These seals are for Wilwood calipers only. They are not designed to fit any other brand of calipers. Brakes are a critical safety component. We strongly recommend against trying to use these seals in other brands of calipers, even if the nominal piston size is the same. The results of brake system failure can have devastating effects!
Note 2: Piston seals get compressed to size when they are installed in the caliper bore. This is required for a tight seal. They will be slightly oversize (up to about 0.10" larger than the nominal size) when they are loose. They will not fit tight against the piston until they are installed in the caliper bore.
