As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER LANDING, BRAKES APPLIED AND WORKED FINE. ACFT WAS TAXIING TO PARKING, PILOT APPLIED BRAKES AND NO RESULT. PEDALS WERE STIFF. SECOND ATTEMPT PROVIDED SAME RESULT. BRAKE PEDALS RELEASED AND BRAKES RETURNED TO NORMAL. R & R POWER BRAKE CONTROL VALVE IAW MM 32-40-00. OPS & LEAK CHECKED GOOD.