Goodrich Wheel & Brake Brake Piston Housing 74-645 OEM Replacement

The Goodrich Wheel & Brake 74-645 is a brake piston housing intended for fixed wing aircraft brake assemblies. Manufactured in the United States under CAGE code 97153, this piston housing is FAA TSO approved and 8130-3 eligible for use in documented FAA-regulated maintenance programs. ECCN is 9A991.d and HTS code is 8807200010.

Brake piston housings form the structural cylinder within which hydraulic pressure acts on the brake piston to apply clamping force to the brake disc stack during landing and ground braking operations. The housing must withstand repeated pressure loading cycles, thermal cycling from ambient through operational temperatures, and exposure to corrosive environments including runway de-icers and moisture. The bore of the piston housing must maintain dimensional accuracy to ensure proper piston travel, uniform seal engagement, and consistent brake force output. The 74-645 measures 1.25 x 1.25 x 0.32 inches and weighs 0.04 lb, indicating a compact individual piston housing for a multi-piston brake configuration where multiple housings are arranged around the brake torque tube.