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

Instruments and Controls
3. Place the transmission in park and set the parking
brake. (See Pages 68 and 74 for transmission
shifting and parking brake information.)
4. Turn OFF the engine.
5. Turn ON the emergency flasher and use other
warning devices to alert other motorists.
6. Wait a few minutes to allow oil to drain into the
engine oil pan, and then check the oil level. (See
page 139 for details on checking oil level.)
7. Add oil if necessary. If the problem persists, contact
an Authorized Service Center.
For further information on operating your engine properly,
see page 58.
Dual Air Pressure Gauge (Air Reservoir)
The dual air pressure gauge indicates the amount of air pressure
in the brake system in pounds per square inch (psi). The
WHITE pointer shows the front (secondary service) reservoir
air pressure, and the ORANGE pointer indicates pressure in
the rear (primary service) reservoir.
FRONT
SECONDARY
SERVICE
CIRCUIT
(WHITE)
02581
Operating Instructions
REAR
PRIMARY
SERVICE
CIRCUIT
(ORANGE)
Dual Air Pressure Gauge (Air Reservoir)
If the pressure in either or both circuits is too low for normal
brake operation (below 64 psi), a warning light in the panel
will glow and the audible alarm will sound.
WARNING! If the light and alarm do not turn off
at start-up, do not try to drive the vehicle until
the problem is found and fixed.
– 26 – Y53-6008 Medium Duty (R10/06)