PurposeUSED TO CHECK HYDRAULIC BRAKE PRESSURE DURING FUNCTIONAL CHECKS OF THE MLG BRAKE, ANTISKID, AUTOBRAKE SYSTEMS AND/OR ASSOCIATED OR OTHER HYDRAULIC SYSTEMAirplane727, 737, 747, 757, 767, 777-200, 777-200ER, 777-200LR, 777-300, 777-300ER, 777-8, 777-9, 777FUsage CodeMAINTENANCE 