Peterbilt Medium Duty Trucks Operator's Manual after 1-07

Instruments and Controls
IGN & ACC: In this position, all circuits are energized. Panel
warning lights will light and the buzzer will sound until (1) the
engine is started, (2) normal oil operating pressure is
reached, and (3) air brake system pressure is above 64 psi
(441 kPa). In this position, the ignition key cannot be
removed.
IGN & START: Turn the key to this position to start your
engine: it energizes the starter and retracts the solenoid
valve to allow fuel supply to the engine. See page 59 for
details on starting the engine.
Parking Brake
Before you leave the cab, apply all parking brakes.
- for vehicles with air brakes:
Operating Instructions
1. Apply all parking brakes. Pull out the Yellow Parking
Brake Control knob (1) located on the dash. In tractors,
the Red (octagon-shaped) Trailer Air Supply Control
knob (2) will automatically pop out.
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Full Truck Parking Brake Valve
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.
– 34 – Y53-6008 Medium Duty (R10/06)