What was found
(CAN) ON LANDING, THE PILOT NOTED THE ACFT PULLED TO THE LT. AFTER LANDING, IT WAS NOTED THAT THE LT TIRE HAD A FLAT SPOT THAT MIGHT HAVE BEEN DUE TO BRAKE BEING ON. INSP OF THE PARKING BRAKE REVEALED THAT WHEN THE PARK BRAKE WAS PUT ON AND THEN TURNED OFF SLOWLY THE BRAKES DID NOT RELEASE. INSP OF THE PARK BRAKE VALVE REVEALED THAT THE CAM AND THE POPPET VALVES WHERE WORN TO A POINT THAT THE VALVE WOULD NOT OPEN SOMETIMES. MFG HAS NO WEAR DIMENSIONS FOR THIS PART.