OPERATOR'S MANUAL

CONTROLS AND DISPLAY OPTIONAL GAUGES
Medium Duty
(R05/09) Y53-6027 – 49 –
Air Operated Horn (Option)
Your Medium Duty vehicle may be equipped with an air
horn. To operate, pull on the lanyard extending from the
overhead header panel.
Trailer Brake Hand Valve
This hand valve provides air pressure to apply the trailer
brakes only. It operates independently of the foot treadle
valve.
To operate the trailer brake hand valve: Pull down on
the lever under the right side of the steering wheel.
WARNING!
If you have these levers, they may be
close together on your steering wheel column.
Exercise care to choose the appropriate lever.
The BrakeSaver lever is located lower and closer
to the driver on the steering column (see
page
59
). Activating the trailer hand brake lever
instead of the BrakeSaver lever could lead to an
accident resulting in death or personal injury.
See “Brake Safety and Emergency” on page 112 for more
complete information on when and how to use your trailer
brake. Or see the Index, under Brake
NOTE: The trailer brake is not to be used as the
main means of braking. To use this brake fre-
quently instead of using the foot brake will wear
out the trailer brake sooner.
WARNING! Always apply the parking brakes
for parking or holding your vehicle on grade. It
is dangerous to use air-applied trailer brakes
for parking or holding a vehicle. Air system
pressure can bleed down and release the
brakes. You could have a vehicle roll-away
causing an accident resulting in death or per-
sonal injury.