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Pneumatic System
The PCM contains the pneumatic solenoids that physically control pressure in
the service line to the relay valve. The 3/8" service line enters and exits the
PCM through integrated quick connect fittings. The PCM also incorporates a
quick exhaust valve that minimizes delays during brake release and helps
purge contaminants that may enter the service control line.
R-12 Relay Valve
Figure 8, Typical Pneumatic Layout for a 2M System
PCM/ECM
Spring Brake
Control Valve
MBS-1P Installation
Gladhand
322UX027
13
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