Multi-Function Valve (14871Al)
k. Air Reservoirs. The two air reservoirs (1, fig. 4-26) are attached to the
frame. The reservoirs provide a supply of air through the emergency relay valve and
the multi-function valve for applying the brakes. The air reservoirs are equipped
with drain cocks (2) for draining accumulations of moisture and for releasing air
pressure in the semitrailer brake system.