TM 9-2320-209-34-2-1 Section III. HYDRAULIC BRAKE SYSTEM 12-5. AIR HYDRAULIC CYLINDER ASSEMBLY REPAIR. TOOLS : Guide rod of same diameter as air cylinder piston pushrod, 12 to 15 inches long, tapered at one end SUPPLIES : Hydraulic slave cylinder repair kit Solvent, dry cleaning, type II (SD-2), Fed. Spec P-D-680 Preservative oil, PL-MED Hydraulic Brake Fluid, silicone, type MIL-B-46176 Crocus cloth PERSONNEL: One EQUIPMENT CONDITION : Truck parked, engine off, handbrake set. a. Preliminary Procedures. (1) Remove air hydraulic cylinder. Refer to TM 9-2320-209-20. (2) Remove hydraulic stoplight switch. Refer to TM 9-2320-209-20. Change 1 12-7