AIR BRAKE TREADLE VALVE FOR ALL M939 SERIES AND HEMMTT. 

THIS IS THE UPPER PORTION OF THE TREADLE ASSEMBLY. YOU WILL HAVE TO REMOVE THE LOWER PEDAL SECTION AND INSTALL IT ON THIS NEW VALVE. 

PLEASE NOTE, THE STOCK VENT PLUMBING FOR THE BRAKE VALVE WILL NOT WORK WITH THIS VALVE. IT WILL EITHER HAVE TO BE LEFT OFF, OR YOU COULD REMOVE THE DUST DIAPHRAGM FROM THE VENT PORT AND TAP THE NEW VALVE IF YOU WOULD LIKE TO RETAIN THE VENT PIPING. 

THIS WILL WORK WITH ABS OR WITHOUT. 

PART # 288383, REPLACES 5009254, 286775. NSN 2530-01-127-1677