PART 4: CONTROLS AND DISPLAYS DASH-MOUNTED FEATURES
(R10/06) Y53-6007 – 33 –
Parking Brake Valve and Trailer Air Supply
Valve
Your parking brake valve is a yellow diamond-shaped
knob located below the right instrument panel. It controls
the parking brakes.
To apply all parking brakes, pull the yellow, or parking
brake, knob out. The truck or tractor parking brakes will
set, and the Trailer Air Supply Valve (red octagon knob)
will automatically trip (“pop out”) and set the trailer parking
brakes. To release both truck/tractor and trailer parking
brakes, push in BOTH yellow and red knobs. For full infor
-
mation on using parking brakes, see section titled “Park-
ing Brakes and Their Use” on page 98 for more
information.
WARNING!
• Do not leave the cab without applying the
parking brake. The truck could roll and
cause an injury accident. Always apply the
parking brake before you leave the cab.
• Stopping with the parking brake controls
can cause a sudden wheel lock-up, loss of
control, or can cause you to be overtaken
by following vehicles. You could be severely
injured. Never pull out the parking brake
valve while the vehicle is moving.
• Do not use the trailer hand brake or service
brakes to park and hold an unattended vehi
-
cle—use the parking brakes. Because ser-
vice brakes work with air pressure, these
brakes could slowly release. Your vehicle
could roll, causing a serious accident.
Someone could be hurt or killed. Never rely
on the service brakes to hold a parked vehi
-
cle.
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