TM 1-1520-238-23 3-255 3.63. BRAKE CONTROL VALVES INTERNAL LEAKAGE REPAIR AND TEST (AVIM) – continued Table III. Test Test For Pressure Applied to Port Pressure (psig) Plug Port Requirements Proof CYL 1 2250 Brake Bleed air from valve by first permitting flow through VALVE port. Cap VALVE port. Hold pressure 3 MINUTES. Internal leakage from CYL 2 port is not allowed. CYL 2 2250 - Purge air from valve by applying low pressure to CYL 2 port. Bleed fluid through bleeder valve. Close bleeder valve. Increase and hold pressure 3 MINUTES. External leakage from CYL 1 port is not allowed. Poppet relieving pressure CYL 2 100 - With pressure applied to CYL 2 port and other ports vented, apply pressure to CYL 1 port. Gradually increase pressure flow of 20 CC/MINUTE until poppet pressure is relieved. Pressure required at CYL 1 port to unseat poppet shall not be more than 30 psig. Internal leakage CYL 2 5 500 1200 - Hold each pressure 3 MINUTES. Leakage from the CYL 1 or VALVE ports is not allowed. 10 500 1200 Valve Fill VALVE port with fluid. Cap VALVE port. Apply each pressure 3 MINUTES. Leakage from CYL 1 port shall not be more than 1 drop per minute at any pressure. Maximum actuation pressure CYL 2 See requirements - Slowly apply pressure with CYL 1 and VALVE ports vented. Observe pressure required to start piston movement. Pressure required shall not be more than 12 psig. (Movement can be observed by placing a nylon rod against end of poppet through CYL 1 port.) GO TO NEXT PAGE