What was found
APPLING RT BRAKE PRESSURE RESULTS IN A SEVERE CHATTER. TAXI CONTROLLABILITY IS DEGRADED. BRAKE EFFECTIVENESS ESTIMATED AT 50%. VISUALLY INSPECTED RT MLG BRAKE FOR SIGNS OF DAMAGE OR ANY DEFECTS. NO DAMAGE NO DEFECTS NOTED. PROCEEDED TO PERFORM BRAKE AND EMERG PARKING BRAKE SYS BLEED IAW TC NO TC·ES0-32·1001. REMOVED LT HYD EDP IAW AMM 29·10·00·910·806, ALL BRAKE & EMERG BLEEDING PERFORMED IAW TASK 32·40· 00·870·801·A & 32-43·05· 870-801-A. DURING BLEEDING RT MLG, FOUND A LOT OF AIR TRAPPED IN BRAKE SYS. OPS CHECKED GOOD. SERVICED HYD SYS IAW AHM 12·13-00. REINSTALLED LT EDP WITH NEW GASKET. TAXI ACFT & OPS CHECKED BRAKES , OPS CHECKED GOOD. NO DEFECTS NOTED.