PurposeUSED TO CHECK BRAKE PRESSURE AFTER MAINTENANCE TO MAIN OR NOSE GEAR BRAKING SYSTEM WHERE BRAKE LINE IS OPENED OR COMPONENT IS REPLACEDAirplane727, 737, 747, 757, 767, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeMAINTENANCE 