Bepco MAXIBRAKE H-Series Hydraulic Spring-Set Parking Brake Black Part KSH101AX Parking Brake Assembly All steel housing provide strength, durability and extra corrosion resistance. Aluminum piston and nylon bearings provide maximum guidance stability that diffuses lateral and twisting motion. Steel alloy springs are epoxy coated to protect against rust and corrosion. Deeper spring cavities and optional spring force outputs offer uniform output and longer service life. The Maxibrake® H-Series Air and Hydraulic Spring-Set Parking Brake release mechanisms are housed inside the unit making them readily available for use. Stamped steel piston with 360° heavy duty plastic bushing and o-ring seal. Specifications: Maximum Pressure (Air/Hydraulic) 125 psi Note: Used with Hydraulic Systems & Backing Plates with 5", 6", & 7" Shoes. Note: Hydraulic Unit compatible with ATF; DO NOT USE BRAKE FLUID *****$40 CORE CHARGE INCLUDED*****