Operator`s manual

OPERATION
319
Foot Brake Valve
The foot brake valve is directly connected to the brake pedal. The valve
gives a progressive output against the pedal travel. This allows better
control of the pressure in the first half of the pedal travel. In the last half
of the pedal travel, the pressure output increase is faster.
The foot brake valve applies the service brakes, incorporating both the
primary and secondary air systems. The primary system controls the
rear brakes and the secondary system controls the front brakes. The
foot brake valve receives air from the compressed air tanks. Air
pressure is then delivered to the wheel brake chambers as required by
the amount of pressure exerted on the foot brake pedal. The brake
chamber force then applies the wheel brakes.
From the operator's viewpoint, operating the foot brake valve of a
vehicle equipped with air brakes differs very little from the operation of
a conventionally braked vehicle. Because the operation of the brake
pedal requires scarcely more effort than depressing the average
throttle pedal, air brakes are naturally much easier to control. If the
driver gives full attention to the following suggestions, a little
experience will make him/her thoroughly familiar with the air-controlled
braking of this vehicle.
Failure to observe these precautions can result in
loss of vehicle control and serious personal injury
or death.
vn-vhd.bk Page 319 Tuesday, July 1, 2008 9:44 AM