Parts list: № Number Qty Name Options 1 R211951 2 Plate (40K) 1 R252954 2 Plate (50K) 2 RE292439 2 Brake Disk 3 R211948 2 Piston 4 R125667 2 Ring 5 R125666 2 Ring 6 R232883 6 Compression Spring Next page: ST558294 Hydraulic Trailer Brake Kit (W/ or W/O Air Brake) ST121894 STEERING SHAFT (AUTOTRAC) ST121900 Wiring Harness , AutoTrac™ ST75303 BRAKE VALVE ATTENUATOR ST104473 Air Brake Control Valve ST121896 Steering Column Pivot ST104475 Air Brake Air Tank ST75297 Brake Valve Hardware Kit, Manual Backup ST75315 AIR BRAKE LINE (REAR) ST121923 AIR BRAKE CONTROL VALVE BRACKET