The service lights on the M871A1 consist of the following lights:
q Five red clearance lights
q Two composite lights (2)
q Two stop, turn and taillights (3) on rear
q Four amber clearance lights (5) on front/side corners
2-9. AIR RESERVOIR DRAIN COCK
Wear protective goggles when opening air reservoir
drain cock and avoid contact with the air stream.
a. The draincock (1, fig. 2-10) is used to relieve air pressure in the
semitrailer braking system.
It is also used for drainage of moisture collected in air reservoir (2).
Air Reservoir Drain Cock