TM 9-2320-209-20-3-2 13-39. AIR BRAKE CUTOFF COCKS AND COUPLINGS REMOVAL AND REPLACEMENT (ALL TRUCKS EXCEPT M764). TOOLS: 9/16-inch wrench 1 1/4-inch wrench (2) 5/8-inch wrench 1 3/8-inch wrench 1 1/8-inch wrench 10-inch pipe wrench 1 1/2-inch wrench SUPPLIES: Anti-seize tape, MIL-T-27730A PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Vent air system. Refer to para 13-20. (2) Remove quick-disconnect coupling half. Refer to para 13-37. 13-270