Lesson 3/Learning Event 1
An air line connects the compressed air in the reservoirs to the
brake valve. The brake pedal operates the lever on the brake valve.
When the brake pedal is depressed, it opens a valve in the brake
valve and measures a certain amount of compressed air from the
reservoirs to go to the front and rear axles.
FIGURE 17. QUICKRELEASE VALVE.
The air line from the brake valve to the front axle goes to a
component known as a quickrelease valve. When the brakes are
applied, the quickrelease valve directs compressed air to the right
and left front brake chambers. When the pedal is released, the air
from the brake chambers escapes out of the quickrelease valve and
releases the front brakes. The air in the line from the brake valve
escapes through the exhaust valve in the brake valve.
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