Wis. Admin. Code Department of Transportation Trans 305.49 - Axle control valves
(1) When a vehicle is equipped with an axle
or axles that raises or lowers by means of air pressure, spring force or
hydraulic pressure, the control valves shall be installed as follows:
(a) The control valve that regulates the
amount of pressure shall be mounted outside of the driver's
compartment.
(b) The control valve
that regulates the movement of the axle or axles so as to raise or lower the
axle or axles may be in the driver's compartment.
(2) This section applies to vehicles
manufactured commencing with the 1998 model year.
Notes
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