MANIFOLD DASH VALVES WITH PUSH TO CONNECT FITTINGS USED TO CONTROL THE PARK BRAKE FUNCTION ON TRUCKS AND TRAILERS WITH AIR BRAKES AND ARE IDENTIFIED WITH A MANUFACTURING DATE CODE OF 001A1K THROUGH 330A1K MANUFACTURED BETWEEN JANUARY 1 AND SEPTEMBER 30, 2002. THE DATE CODE IS STAMPED INTO THE BACK OF THE VALVE BODY. THE PARK KNOB CAN POP OUT UNEXPECTEDLY WHILE THE VEHICLE IS IN MOTION. THIS WILL EXHAUST THE AIR FROM THE PARK BRAKE SYSTEM ON THE TRAILER AND APPLY THE PARKING BRAKES.