BRAKE SYSTEM CONTINUED
Air from the pressure regulator enters the valve (Figure 18, Item 1) and into the cavity in back of the spindle
assembly where it is sealed off. Flow also enters the pilot passageway (Figure 18, Item 2) to the diaphragm where
it is sealed off by the plunger (Figure 18, Item 3).
Figure 18. Cutaway of Air Solenoid Valve (Closed).