What was found
AIRCRAFT WAS GROUNDED: EVEN WHEN ON SMOOTH PORTIONS OF TAXIWAYS THE FLIGHT CREW REPORTED FEELING MUTLIPLE TIMES SERIES OF VERY NOTICEABLE MODERATE BUMPS AND SUSPECTED THE BRAKES WERE BRIEFLY LOCKING UP UN-COMMANDED EVEN WITHOUT THE PEDALS BEING TOUCHED - MAINTENANCE FOUND THE POSITION 1 WHEEL ASSEMBLY TIE BOLT HAD SHEARED CAUSING DAMAGE TO THE BRAKE ASSEMBLY - MAINTENANCE REPLACED THE BRAKE ASSEMBLY ALONG WITH THE WHEEL TIRE ASSEMBLY PER AMM 32-41-11 AND 32-42-27