MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
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MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company

peterbilt.com
from peterbilt.com More from this publisher
20.05.2014 Views

Using the Brake System WARNING! Do not use the trailer hand brake or service brakes to park and hold an unattended vehicle—use the parking brakes. Because service brakes work with air pressure, these brakes could slowly release. Your vehicle could roll, causing a serious accident. Someone could be hurt or killed. Never rely on the service brakes to hold a parked vehicle. Parking Tractor and Trailer • With both knobs pushed in for normal operating modes, the parking brakes of both the tractor and the trailer may be applied by pulling the Yellow knob OUT. This will exhaust the air from the tractor spring brakes, and simultaneously cause the Red knob to pop OUT, which will apply the trailer brakes. This complies with the FMVSS 121 requirement that one control should apply all the parking brakes on the vehicle. Trailer Charge Operating Instructions • If both knobs are OUT (combination vehicle is parked), and it is desired to recharge the trailer, the Red knob may be pushed IN to repressurize the trailer supply line. The tractor will remain parked. For more information on air supply pressure requirements, see page 74. Brake Safety and Emergency WARNING! Do not operate the vehicle in the event of a malfunction in any air circuit. The vehicle should not be operated until the system is repaired and both braking circuits, including all pneumatic and mechanical components, are working properly. Loss of system air can cause the service brakes to not function resulting in the sudden application of the spring brakes causing wheel lock-up, loss of control, or overtake by following vehicles. You could be in an accident and severely injured. – 76 – PB1318 3/01 Model 330

Operating Instructions Front Brakes — Truck The following applies to full truck configurations: If air pressure is lost in the front circuit, the vehicle front brakes will not operate. Check valves isolate the rear circuit, so the rear service brakes and parking brakes are unaffected. The spring brakes will not automatically apply as long as rear service pressure is maintained. WARNING! If the remaining system pressure drops below 60 psi (414 kPa) due to repeated brake applications, the spring brakes will automatically apply—stopping the vehicle abruptly, potentially causing serious injury. Observe the warning light (BRAKE AIR) in the panel. If it comes on, do not continue to drive the vehicle until it has been properly repaired or serviced. Rear Brakes — Truck The following applies to full truck configurations: If air is lost in the rear brake circuit, check valves isolate the front circuit, and front brake operation is unaffected. Because this is a dual air system, spring brakes will not automatically apply as long as pressure is maintained in the front circuit. Using the Brake System When the brake pedal is depressed, the modulating valve detects the reduction or absence of rear service delivery pressure, and exhausts air from the spring chambers, applying the spring brakes in proportion to the front brake application. When releasing the brake pedal, the modulating valve delivers front service air to the spring brake chambers, releasing the spring brakes in proportion to the front brake application. Thus, if there is a rear service failure, the remaining front axle braking is supplemented by modulated spring brake action on the rear axle. WARNING! Efficiency of emergency braking depends on the amount of air available in the front circuit reservoir, which is sufficient for a limited number of brake applications and releases. • REMEMBER: when the remaining system pressure drops below 60 psi (414 kPa), the spring brake is automatically applied, stopping the vehicle abruptly, potentially causing serious injury. Observe the warning light (BRAKE AIR) in the panel, it will come on before the spring brakes are applied. If it comes on, do not continue to drive the vehicle until it has been properly repaired or serviced. Model 330 PB1318 3/01 – 77 –

Using the Brake System<br />

WARNING! Do not use the trailer hand brake or<br />

service brakes to park and hold an unattended<br />

vehicle—use the parking brakes. Because service<br />

brakes work with air pressure, these brakes<br />

could slowly release. Your vehicle could roll,<br />

causing a serious accident. Someone could be<br />

hurt or killed. Never rely on the service brakes to<br />

hold a parked vehicle.<br />

Parking Tractor and Trailer<br />

• With both knobs pushed in for normal operating modes,<br />

the parking brakes of both the tractor and the trailer may<br />

be applied by pulling the Yellow knob OUT. This will<br />

exhaust the air from the tractor spring brakes, and simultaneously<br />

cause the Red knob to pop OUT, which will<br />

apply the trailer brakes. This complies with the FMVSS<br />

121 requirement that one control should apply all the<br />

parking brakes on the vehicle.<br />

Trailer Charge<br />

Operating Instructions<br />

• If both knobs are OUT (combination vehicle is parked),<br />

and it is desired to recharge the trailer, the Red knob<br />

may be pushed IN to repressurize the trailer supply line.<br />

The tractor will remain parked. For more information on<br />

air supply pressure requirements, see page 74.<br />

Brake Safety and Emergency<br />

WARNING! Do not operate the vehicle in the<br />

event of a malfunction in any air circuit. The<br />

vehicle should not be operated until the system<br />

is repaired and both braking circuits, including<br />

all pneumatic and mechanical components, are<br />

working properly. Loss of system air can cause<br />

the service brakes to not function resulting in<br />

the sudden application of the spring brakes<br />

causing wheel lock-up, loss of control, or overtake<br />

by following vehicles. You could be in an<br />

accident and severely injured.<br />

– 76 – PB1318 3/01 Model <strong>330</strong>

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