What was found
(CAN) WEAK BRAKE PERFORMANCE DURING HIGH SPEED ROLL. PERFORMED VISUAL INSPECTION OF ALL 4 BRAKES, FUSE AND SHUTTLE VALVE WITHOUT FINDINGS. CHECKED HYDRAULIC LEVEL. QUANTITY PRESSURIZED AND UNPRESSURIZED, FOUND 15% CHANGE IN QUANTITY INDICATION. REPLACED ALSO NORMAL BRAKE CONTROL VALVE ACC PER AMM 32-42-06-000/400-801 REV65 FOR T/S. PERFORMED BLEEDING OF MAIN BRAKE SYSTEM ACC AMM 32-42-00-870-801 REV65 AND FUNCTIONAL CHECK OF MAIN LANDING GEAR BRAKE SYSTEM ACC AMM 32-42-00-720-801 REV65 WITH NORMAL OPS. BLEEDING OF BRAKE SYSTEM AND HYDRAULIC SYSTEM#1 PERFORMED IAW AMM 29-10-00-870-083 REV 65. CHECK OF MAIN BRAKE SYSTEM TEST WITH HIGH SPEED TAXING PERFORMED. TEST NOT SUCCESSFUL IAW OS-D84 ROLL_TEST.DOC A/C STEERS TO THE LEFT DURING BRAKING HIGH AND LOW SPEED.RIGGING OF THE MAIN BRAKE CONTROL CABLES ACC. AMM 32-42-00-830-801 R65 PERFORMED. FOUND ALL VALUES IN LIMIT. DUE TO FAULT SYMPTOM CHANGED SINCE REPLACEMENT OF BRAKE CONTROL VALVE [FROM WEAK BRAKES TO UNEVEN BRAKING]), REPLACED BRAKE CONTROL VALVE AGAIN PER AMM 32-42-06. (TC# 20190621005)