Front axle LQ-2 quick release and limiting valve (ratio control valve) for M939 series with ABS. P/N WCDFAPL-100. NSN 2530015156392.
The LQ-2 valve is used on the front, (steering axle) of a vehicle to limit the brake application pressure to the actuators during normal service braking. In addition the valve speeds up brake chamber release by exhausting air directly at the valve.
Ports are 3/8 inch N.P.T. except control port which is 1/4 inch N.P.T.