Regional Haul Model Operator's Manual - Peterbilt Motors Company
Regional Haul Model Operator's Manual - Peterbilt Motors Company Regional Haul Model Operator's Manual - Peterbilt Motors Company
BRAKE SAFETY AND EMERGENCY 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 death or 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. STARTING AND OPERATING THE VEHICLE 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. 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. – 108 – Y53-6033 Regional Haul (R05/10)
STARTING AND OPERATING THE VEHICLE 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 death or 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. Brakes — Tractor/Trailer The following applies to tractor/trailer configurations: If pressure is lost in the tractor front or rear circuit, the “check” valves isolate the unaffected circuit, allowing this circuit to continue normal operation. The trailer brakes are still functional. BRAKE SAFETY AND EMERGENCY • If air pressure is lost in the trailer supply/park circuit, and the pressure drops below 60 psi (414 kPa), the trailer spring brakes are automatically applied, and the tractor air pressure circuits are unaffected. • If air pressure is lost in the trailer brake service circuit, and the pressure in the tractor front and rear circuits drops below 60 psi (414 kPa), the tractor and trailer spring brakes are automatically applied. Emergency Braking WARNING! Unless you have an anti-lock braking system, always avoid completely depressing the service brake pedal, if possible, even during emergency braking. Depressing the brake pedal too aggressively can cause the wheels to lock, which can lead to an uncontrolled skid and can result in an accident involving death or personal injury. For Non-ABS Vehicles: To stop your vehicle in an emergency, vary the service brake application pressure to provide maximum braking force without locking the wheels. Regional Haul (R05/10) Y53-6033 – 109 –
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STARTING AND OPERATING THE VEHICLE<br />
WARNING! Efficiency of emergency braking<br />
depends on the amount of air available in the<br />
front circuit reservoir, which is sufficient for a<br />
limited number of brake applications and<br />
releases.<br />
• REMEMBER: when the remaining system<br />
pressure drops below 60 psi (414 kPa), the<br />
spring brake is automatically applied, stopping<br />
the vehicle abruptly, potentially causing<br />
death or serious injury. Observe the<br />
warning light (BRAKE AIR) in the panel, it<br />
will come on before the spring brakes are<br />
applied. If it comes on, do not continue to<br />
drive the vehicle until it has been properly<br />
repaired or serviced.<br />
Brakes — Tractor/Trailer<br />
The following applies to tractor/trailer configurations:<br />
If pressure is lost in the tractor front or rear circuit, the<br />
“check” valves isolate the unaffected circuit, allowing this<br />
circuit to continue normal operation. The trailer brakes are<br />
still functional.<br />
BRAKE SAFETY AND EMERGENCY<br />
• If air pressure is lost in the trailer supply/park circuit,<br />
and the pressure drops below 60 psi (414 kPa), the<br />
trailer spring brakes are automatically applied, and<br />
the tractor air pressure circuits are unaffected.<br />
• If air pressure is lost in the trailer brake service circuit,<br />
and the pressure in the tractor front and rear circuits<br />
drops below 60 psi (414 kPa), the tractor and trailer<br />
spring brakes are automatically applied.<br />
Emergency Braking<br />
WARNING! Unless you have an anti-lock<br />
braking system, always avoid completely<br />
depressing the service brake pedal, if possible,<br />
even during emergency braking.<br />
Depressing the brake pedal too aggressively<br />
can cause the wheels to lock, which can lead<br />
to an uncontrolled skid and can result in an<br />
accident involving death or personal injury.<br />
For Non-ABS Vehicles: To stop your vehicle in an emergency,<br />
vary the service brake application pressure to provide<br />
maximum braking force without locking the wheels.<br />
<strong>Regional</strong> <strong>Haul</strong> (R05/10) Y53-6033 – 109 –