Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
Peterbilt Medium Duty Truck Owner's Manual - Peterbilt Motors
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USING THE BRAKE SYSTEM<br />
torque. Do not allow the Wheel Spin Control lamp to<br />
remain on continuously for an extended length of time.<br />
Extended, continuous use of the ASR / ATC can cause<br />
overheating of the drive wheel brakes. Engine torque or<br />
vehicle speed should be reduced to eliminate wheel spin<br />
and prevent excessive application of the ASR / ATC system.<br />
Except for checking for proper illumination of the ABS and<br />
Wheel Spin Control warning lamps when first starting the<br />
truck and for monitoring these lamps while driving, no<br />
special operating procedures are required. For detailed<br />
system description, see service literature for your specific<br />
ABS that was provided with your vehicle.<br />
Trailer Brake Hand Valve<br />
Tractor/trailer vehicles are equipped with a trailer brake<br />
hand valve mounted on the right side of the steering<br />
wheel column. This hand valve provides air pressure to<br />
apply the trailer brakes only. It operates independently of<br />
the foot treadle valve.<br />
STARTING AND OPERATING THE VEHICLE<br />
To operate the trailer brake hand valve:<br />
• Pull down on the lever.<br />
• The valve is self-returning. When pressure is removed<br />
from the valve lever, it will return to the OFF position.<br />
NOTE: The trailer brake is not to be used as a<br />
substitute for the service brakes. Using this brake<br />
frequently, instead of using the foot brake, will<br />
cause the trailer brakes to wear out sooner.<br />
WARNING! Do not use the trailer hand brake<br />
or service brakes to park and hold an unattended<br />
vehicle—use the parking brakes.<br />
Because service brakes work with air pressure,<br />
these brakes could slowly release. Your<br />
vehicle could roll, causing a serious accident.<br />
Someone could be hurt or killed. Never rely on<br />
the service brakes to hold a parked vehicle.<br />
Driving Bobtail or With an Unloaded Trailer<br />
NOTE: The following information is applicable<br />
only to tractor configurations.<br />
Do not use the engine retarder (such as an<br />
exhaust brake) to slow the vehicle down when you are<br />
bobtailing or pulling an empty trailer.<br />
– 116 – Y53-6027 <strong>Medium</strong> <strong>Duty</strong> (R05/09)
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