TM 9-2320-209-20-3-2 13-24. AIR BRAKE HAND CONTROL VALVE REMOVAL AND REPLACEMENT. TOOLS: 5/8-inch open end wrench 9/16-inch open end wrench 5/16-inch sockethead screw key (Allen wrench or equivalent) SUPPLIES: Chalk, SS-C-266F PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Removal. FRAME 1 NOTE When you take out a line or fitting, using chalk, mark it so that it goes back in same place. 1. Turn handle (1) on drain cock (2) so handle alines with drain cock. Do this on both reservoirs (3). GO TO FRAME 2 13-170