As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BRAKE FAILED FOLLOWING A LONG FAST TAXI. IT APPEARS THAT THE PIOT HOLDS POWER ON AND RIDES THE BRAKE. PILOT REPORTED THE HE STEPPED ON BRAKE WITH NO RESPONSE. PROBLEM COULD NOT BE DUPLICATED. HOLDING BRAKE AT VARIOUS PRESSURES FOR PERIODS OF 5 MINUTES EACH SHOWED NO SIGN OF FAILURE, HOWEVER UPON DISASSEMBLY, THE O-RING WHICH SEALS THE PLUNGER SHOWED FLATTENING DUE TO AGE. TIME ON THE O-RING IS UNKNOWN.