What was found
BRAKE SHUTTER DURING LOW SPEED TAXI IN TO A FULL STOP. SOUNDS MORE PROMINENT ON RIGHT SIDE, BUT CAN FEEL IT IN BOTH PEDALS. VISUALLY INSPECTED BRAKES. NO DEFECTS NOTED. PERFORMED TAXI CHECK AND CONFIRMED ISSUE. MCC ADVISED NR 4 BRAKE RECENTLY CHANGED. PERFORMED A BLEED OF THE BRAKE SYSTEM AND FOUND A LARGE AMOUNT OF AIR WITHIN THE NR 4 BRAKE SYSTEM. PERFORMED A SUBSEQUENT TAXI CHECK AND BRAKES FELT NORMAL. PERFORMED A ANOTHER BLEED AND CONFIRMED NO AIR. WORK PERFORMED IAW AMM 32-42-00 OPS CHECK GOOD LEAK CHECK GOOD.