Kent-Moore Tools Kent-Moore J-45863 Caliper Piston Seal Installer for GM. J-45863 is correctly sized to install the boot seals on both pistons of the front dual-piston calipers. Improper boot seal installation can damage the boot seal, or scratch the piston, and may impair brake operation. Applications: COLORADO / CANYON. Availability: Drop ship from factory. Usually ships within 2-3 days. Ships via UPS.