As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI OUT THE RIGHT MAIN LANDING BRAKES SHUTTERED VIOLENTLY! TAXIED BACK TO RAMP! REMOVED THE WORN RH BRAKE ASSEMBLY. INSTALLED A OVERHAULED RH BRAKE ASSEMBLY REFERENCING AMM: 32.-45-.21-000/400-801-A. BLED THE BRAKE SYSTEM REFERENCING AMM: 32-40-00-870-801-A. SERVICED THE HYDRAULIC RESERVOIR REFERENCING MAM: 12-13-00-610-802-A. OPS AND LEAK CHECK ARE GOOD