[chuck]

When you turn knob to drive mode sends air from the center of 5 cube air solenoids, air from center goes to front 5 port Norgren valve to control port in steer compartment and from there it T’s off of control port 1/4 air line to rear bulk head where there are 2 more 5 port Norgren valves that control rear of bus look at pic of air schematic then I will try to email you a link, Is the air bags in good shape is there any leaks??