The airbrake system is a dual (split) type with a primary (rear) and secondary (front) supply system. It is designed to allow
the driver to stop the vehicle if a leak develops in either system. The system consists of an air compressor, a primary and
secondary air reservoir, brake pedal valve, two relay valves, quick-release valve, two relay quick-release valves, six
airbrake chambers, six brake assemblies, and an antilock system.
The air compressor is a single action reciprocating piston-type mounted on the engine and is lubricated by engine oil
pressure and cooled with engine coolant. it is belt driven by the engine and runs continually. The actual compression of air
is controlled by a governor mounted on the compressor, acting on air reservoir pressure.
The air reservoirs are welded steel constructions mounted under the left side of the cab. They store air under pressure
from the compressor to supply the brake system with the needed pressure to apply the brakes. The primary reservoir
supplies air pressure for the rear brakes. The secondary reservoir supplies air pressure for the front brakes and has a
separate supply reservoir mounted