Air Brake Manual
Air Brake Manual
Air Brake Manual
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30 28<br />
26<br />
24<br />
20<br />
31<br />
In this illustration, the driver has made a brake application<br />
with the foot valve (31) and application air is<br />
being delivered to the tractor brake chambers. The<br />
two-way check valve (26) has shifted to the low<br />
pressure side, allowing application air to reach the<br />
tractor protection valve (24).<br />
There is no air loss from the tractor through the<br />
disconnected glad hands (20).<br />
If the driver, by mistake, applied the hand valve (30)<br />
with the trailer disconnected, the application air<br />
directed to the tractor protection valve would also<br />
be dead-ended. Again, no air loss would occur if the<br />
trailer supply valve (28) is in the closed position.<br />
30 28<br />
26<br />
24<br />
20<br />
31<br />
45
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