Kenworth T410, Driver'S Handbook Manual

Page: 173 / 418

CAT: 8612 November 2019 Page 147
OPERATING INSTRUCTIONS
BRAKE OPERATION
Do not drive through water deep enough to wet brake components,
as it may cause the brakes to work less efficiently than normal. The
vehicle’s stopping distance may be longer than expected and the
vehicle may pull to the left or right when brakes are applied, which
could contribute to an accident.
To rectify this condition, check the rear and both sides of the vehicle for
clear traffic, then apply the brakes gently, releasing and gently reapplying
until the brakes dry out and normal operation is restored. Always check
brakes after driving through deep water to help reduce the possibility of
personal injury or an accident.
Front Brake System
When the brake pedal is depressed, the front circuit portion of the treadle
valve delivers air from the front service reservoir to the front axle brake
chambers via the front relay/ATR-6 valve and ABS pressure modulation
valves.
Simultaneously (on-full truck configurations) air is also supplied to the
modulating valve control port. In the event of a rear service circuit failure,
the modulating valve will exhaust air from the spring brake chambers,
applying the spring brakes in proportion to the front circuit application.
Rear Brake System
When the brake pedal is depressed, the rear circuit portion of the treadle
valve delivers air from the rear service reservoir to the rear ATR-6 valve
control port. The ATR-6 valve then delivers air directly from the rear service
reservoir to the rear brake chambers via the ABS pressure modulation
valves in proportion to the treadle pressure.
Brake Application Air Gauge
The Brake Application Air gauge will show how much air pressure is being
applied from the foot brake valve or trailer brake hand valve to the air
brakes. It is a virtual gauge which is connected to the brake valve.