Page 146
CAT: 8612 November 2019
OPERATING INSTRUCTIONS
USING THE BRAKE SYSTEM
The operation of the vehicle’s braking system and many vehicle accessories
depends on the storage and application of a high-pressure air supply.
The air brake system contains dual circuits; a circuit for the rear brakes
(primary) and a circuit for the front brakes (secondary). The trailer air is
supplied from these two circuits. The system is supplied by an engine-
driven compressor. The vehicle’s compressor takes outside air and
compresses it, usually to 690 to 896kPa. The compressed air then goes
to the reservoirs to be stored until needed.
Upon operation of the service brake, stored air flows from the air tanks to
the brake chambers. The pressure of this delivered air is regulated through
the foot valve. There is no direct force applied to the air by foot pressure.
In hydraulic braking systems, such as cars, force applied to the brake
pedal is transferred directly to the hydraulic fluid. As fluid is virtually
incompressible, this gives the feeling of a firm brake pedal. You will not feel
this in a pneumatic brake system as used in trucks, because the operator
is simply operating a valve.
The brake system is a critical vehicle safety system. For the safety
of yourself and others around you, have the vehicle submitted for
scheduled preventive maintenance checks as well as having any
suspected problems immediately checked by an authorised service
dealer. Failure to properly maintain your brake system can lead to
serious accident and/or injury.
Never drive your vehicle with the parking brake applied. Always release
the parking brakes prior to moving the vehicle. Failure to disengage the
parking brakes prior to moving your vehicle could result in excessive heat
build-up in the brake system, resulting in a fire.
Today’s diesel electronic engines have significant torque and startability
power at low rpm. Combinations of engine speed and available torque
may over-power the vehicle’s parking brakes.
AIR SUPPLY SYSTEM
Contamination of the air supply system is the major cause of problems
in air-operated components such as brake valves and suspension height
control valves. To keep contaminants to the lowest possible level, follow
all maintenance procedures.
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