As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO GATE AFTER BEING CLEARED INTO POSITION FOR TAKEOFF DUE TO ABNORMAL FEEL IN BRAKES; RIGHT MAIN BRAKES FELT AS IF THEY WERE BRAKING. ONSET OF BRAKING AFTER PEDAL APPLICATION WAS UNEVEN. TAXIED ACFT WITH ANTISKID ON AND OFF. BRAKING WAS NORMAL WITH NO DEFECTS NOTED. ANTISKID CK'D GOOD BOEING M/M.