MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
Using the Brake System USING THE BRAKE SYSTEM NOTE: Today’s diesel engines have significant torque and startability power at low RPMs. Combinations of engine speed and available torque may overpower the vehicle’s parking brakes. WARNING! Never drive your vehicle with the parking brakes applied. Always release the parking brakes prior to moving the vehicle. Failure to disengage the parking brakes prior to moving your vehicle could result in excessive heat buildup of the brakes and start a fire. Introduction NOTE: If your truck is equipped with hydraulic brakes, go to page 86. The operation of the vehicle’s braking system and many vehicle accessories depends upon the storage and application of a high-pressure air supply. Operating Instructions This air brake system is a multiple circuit type: it has a circuit for the front wheels, a separate circuit for the rear wheels, and one for the trailer (tractors only). The system is supplied by a compressor driven by the engine. The vehicle’s compressor takes outside air and compresses it, usually to 100– 130 psi (690–896 kPa). This compressed air then goes to the reservoirs to be stored until needed. When you operate your air brakes, the stored compressed air flows into the chambers where it is used to apply your truck and trailer brakes. That is why, when you push down on the brake pedal, you do not feel the same amount of pressure on the pedal that you do when you apply the brakes on your car. All you are doing on your truck is opening an air valve to allow air to flow into the brake chambers. WARNING! The brake system is a critical vehicle safety system. For the safety of you and others around you, have the vehicle submitted for periodic preventive maintenance checks as well as having any suspected problems immediately checked by an Authorized Service Center. Failure to properly maintain your brake system can lead to serious injury accidents. – 70 – PB1318 3/01 Model 330
Operating Instructions Brake Operation WARNING! Do not drive through water deep enough to wet brake components, as it may cause the brakes to work less efficiently than normal. The vehicle’s stopping distance may be longer than expected, and the vehicle may pull to the left or right when brakes are applied, which could contribute to an accident. If you think your brakes have become wet, check the rear and both sides of the vehicle for clear traffic, then gently apply the brakes, releasing and gently reapplying until the brakes dry out—restoring normal operation. Always check your brakes after driving through deep water to help reduce the possibility of personal injury or an accident. Front Brake System When the brake pedal is depressed, the front circuit portion of the treadle valve delivers air from the front service reservoir to the front axle brake chambers via a quick-release valve. Using the Brake System Simultaneously (on full truck configurations), air is also supplied to the modulating valve control port. In the event of a rear service circuit failure, the modulating valve will exhaust air from the spring brake chambers, applying the spring brakes in proportion to the front circuit application. Rear Brake System When the brake pedal is depressed, the rear circuit portion of the treadle valve delivers air from the rear service reservoir to the service brake relay valve control port. The relay valve then delivers air directly from the rear service reservoir to the rear brake chambers in proportion to the treadle pressure. On tractors without ABS, the relay valve is part of the BP-R1 brake valve, which automatically proportions the drive axle brake application pressure when driving bobtail (without a trailer connected). The proportioning BP-R1 brake valve allows full use of the steer axle (front) brakes and reduces the chance that the drive axle brakes will lockup. The bobtail brake proportioning system is automatically turned off when a trailer is connected. Model 330 PB1318 3/01 – 71 –
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- Page 125 and 126: PREVENTIVE MAINTENANCE INTRODUCTION
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Using the Brake System<br />
USING THE BRAKE SYSTEM<br />
NOTE: Today’s diesel engines have significant<br />
torque and startability power at low RPMs. Combinations<br />
of engine speed and available torque may<br />
overpower the vehicle’s parking brakes.<br />
WARNING! Never drive your vehicle with the<br />
parking brakes applied. Always release the parking<br />
brakes prior to moving the vehicle. Failure to<br />
disengage the parking brakes prior to moving<br />
your vehicle could result in excessive heat buildup<br />
of the brakes and start a fire.<br />
Introduction<br />
NOTE: If your truck is equipped with hydraulic<br />
brakes, go to page 86.<br />
The operation of the vehicle’s braking system and many vehicle<br />
accessories depends upon the storage and application of<br />
a high-pressure air supply.<br />
Operating Instructions<br />
This air brake system is a multiple circuit type: it has a circuit<br />
for the front wheels, a separate circuit for the rear wheels,<br />
and one for the trailer (tractors only). The system is supplied<br />
by a compressor driven by the engine. The vehicle’s compressor<br />
takes outside air and compresses it, usually to 100–<br />
130 psi (690–896 kPa). This compressed air then goes to the<br />
reservoirs to be stored until needed.<br />
When you operate your air brakes, the stored compressed air<br />
flows into the chambers where it is used to apply your truck<br />
and trailer brakes. That is why, when you push down on the<br />
brake pedal, you do not feel the same amount of pressure on<br />
the pedal that you do when you apply the brakes on your car.<br />
All you are doing on your truck is opening an air valve to allow<br />
air to flow into the brake chambers.<br />
WARNING! The brake system is a critical vehicle<br />
safety system. For the safety of you and others<br />
around you, have the vehicle submitted for periodic<br />
preventive maintenance checks as well as<br />
having any suspected problems immediately<br />
checked by an Authorized Service Center. Failure<br />
to properly maintain your brake system can<br />
lead to serious injury accidents.<br />
– 70 – PB1318 3/01 Model <strong>330</strong>