Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Operating Instructions<br />
Using the Brake System<br />
The parking brakes act on the rear wheels only. They are<br />
spring-applied, with air pressure used to release them.<br />
Release air is supplied by both the front and rear circuit reservoirs<br />
through a double check valve.<br />
NORMAL OPERATING<br />
POSITION<br />
PARK TRAILER WITH<br />
TRACTOR RELEASED OR<br />
BOBTAIL TRACTOR<br />
SYSTEM PARK OR<br />
CHARGE TRAILER<br />
WITH TRACTOR PARKED<br />
TRAILER<br />
AIR<br />
SUPPLY<br />
PARKING<br />
BRAKE<br />
TRAILER<br />
AIR<br />
SUPPLY<br />
PARKING<br />
BRAKE<br />
TRAILER<br />
AIR<br />
SUPPLY<br />
PARKING<br />
BRAKE<br />
RED<br />
YELLOW<br />
RED<br />
YELLOW<br />
RED<br />
YELLOW<br />
02393<br />
Trailer Park or Emergency Brake Application Only<br />
If you ever have a failure or disconnect the air supply hose to<br />
the trailer, the trailer parking brakes will set. The Red knob<br />
will automatically pop OUT and seal off the tractor air reservoirs<br />
to protect the tractor air system pressure.<br />
To apply the trailer brakes only:<br />
Pull OUT the Red knob. This will exhaust air from the trailer<br />
supply line, causing the tractor protection valve to close and<br />
the trailer spring brakes to apply. The trailer is now in “emergency”<br />
or “park.” This mode would be used to uncouple from<br />
the trailer and during bobtail operation (running without a<br />
trailer connected).<br />
<strong>Medium</strong> <strong>Duty</strong> (R10/06) Y53-6008 – 77 –
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