TM 9-2320-209-20-3-2 13-23. AIR BRAKE HAND CONTROL VALVE REPAIR. NOTE Repair of air brake hand control valve is limited to replacement of handle. TOOLS: 5/16-inch sockethead screw key (Allen wrench or equivalent) 5/32-inch sockethead screw key (Allen wrench or equivalent) SUPPLIES: None PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 1. Turn handle (1) on drain cock (2) so handle lines up with drain cock. Do this to both reservoirs (3). GO TO FRAME 2 13-166