BC Transit – Air Brake Course

Primary Air Loss in a Simple Dual Circuit System
This time the air loss occurred in the primary system. The one-way check valve at the inlet to the
secondary reservoir will close to protect that air. The low air warning devices will activate by 60 psi.,
and the governor will load the compressor at 85 psi or better. Again, air from the compressor is being
pumped to atmosphere. The front brakes are the only brakes working. Since this is a long wheel base
vehicle, where most of the braking is accomplished by the rear brakes, we are in serious trouble! We’ll
see how to fix this undesirable situation in a few minutes.
Left click for animation
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