PART 4: CONTROLS AND DISPLAYS
Parking Brake Valve and Trailer Air Supply Valve
By placing the switch in the unlock position, you can slide
the
fi
fth wheel to various positions to adjust weight distribu-
tion.
There is a guard over this switch to protect you against
accidentally activating or releasing the lock.
WARNING! Do not move the
fi
fth wheel while
the tractor-trailer is in motion. Movement of the
fi
fth wheel while a tractor-trailer is moving can
cause a serious accident. Your load could shift
suddenly, causing you to lose control of the ve-
hicle. Never operate the vehicle with the switch
in the unlock position. Always inspect the
fi
fth
wheel after you lock the switch to be sure the
fi
fth wheel is engaged.
Parking Brake Valve and Trailer Air
Supply Valve
02908
Single Valve
Your parking brake valve is a yellow diamond-shaped knob
located on the right-hand control panel. It controls the park-
ing brakes for either straight truck or tractor-trailer combi-
nations.
• At a right-hand drive station, a second single valve is
located on the dash to the left of the steering wheel.
R(08/07)
Y53-6015
– 35 –
Summary of Contents for Peterbilt 320
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Page 210: ...PART 11 SUBJECT INDEX Windshield Washer Reservoir 29 206 Y53 6015 R 08 07 ...
Page 212: ...Peterbilt Motors Company P O Box 90208 Denton Texas 76202 ...