TM 9-2320-209-20-3-1 7-69. LOW AIR PRESSURE BUZZER SWITCH REMOVAL AND REPLACEMENT. TOOLS: Flat-tip screwdriver 5/8-inch open end wrench 7/16-inch wrench 13/16-inch open end wrench 1/2-inch wrench SUPPLIES: Tags PERSONNEL: One EQUIPMENT CONDITION: Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Vent air system pressure. Refer to Part 2, para 13-20. (2) Disconnect battery ground cable. Refer to para 7-58. b. Removal. FRAME 1 1. Look at low air pressure switch to see if it is type A or type B. IF SWITCH IS TYPE A, GO TO FRAME 2. IF SWITCH IS TYPE B, GO TO FRAME 3 7-266