As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAXI, UPON APPLYING THE BRAKES, THERE WAS A STRONG RUBBING SOUND AND VIBRATION IN THE PEDALS. FLIGHT ATTENDANTS ALSO FELT VIBRATION AND HEARD NOISES. HAPPENED 4 TIMES. RETURNED TO GATE. FOUND NUMBER 2 BRAKE ASSEMBLY WORN TO LIMIT AND DRAGGING WHEN AIRCRAFT WAS JACKED, REMOVED AND REPLACED NUMBER 2 BRAKE ASSEMBLY, PER AMM 32-41-41. OPERATIONAL TESTED GOOD SPIN CHECK, NO LEAKS NOTED