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 Parking Brake The yellow diamond-shaped knob on the dash controls the truck/tractor parking brakes. These are spring brakes that you activate by releasing air pressure from their chambers. When they are not in use, air pressure compresses the springs and releases the brakes. Pulling the knob OUT applies the parking brake, which exhausts air from the chambers and allows the springs to extend and apply the brakes. WARNING! Do not pull out the parking brake valve while the vehicle is moving. Stopping with the parking brake controls can cause a sudden wheel lock-up, loss of control, or over-take by following vehicles. You could be severely injured. WARNING! Do not leave the cab without applying the parking brake. The truck could roll and cause an injury accident. Always apply the parking brake before you leave the cab. Before you leave the cab: Operating Instructions 1. Apply all parking brakes. Pull out the Yellow Parking Brake Control knob located on the dash. The Red (octagon-shaped) Trailer Air Supply Control knob on tractors will automatically pop out. (An optional dash warning light will indicate when the brake is ON.) 2. Shift the transmission into PARK position: • manual transmission, select First or Reverse gear • automatic transmission, select Neutral. 3. Turn the key to OFF. 4. Remove the key. PULL TO APPLY PARKING BRAKE PUSH TO RELEASE 02394-1 Full Truck Parking Brake Control Knob – 72 – PB1318 3/01 Model 330
Operating Instructions (2) Trailer Air Supply Control (Red) (1) Parking Brake Control (Yellow) To release the trailer brakes ONLY: Using the Brake System • Push IN the Red knob on the dash. The truck or tractor will remain parked. To release the full combination of brakes: Combination (Tractor/Trailer) Parking Brake Control Valves The parking brakes act on the rear wheels only. They are spring-applied, with air pressure used to release them. Release air is supplied by both the front and rear circuit reservoirs through a double check valve. To release the truck or tractor parking brakes ONLY: 02394 • Push IN the Yellow knob on the dash. Your trailer will remain parked. Below 60 psi (414 kPa) the Yellow parking brake valve remains OUT (ON position). If air pressure is not restored above 60 psi (414 kPa), the knob will automatically return to the OUT position if you attempt to push it in. See page 25 for more information. • Push IN BOTH knobs on the dash. • In the event that air pressure is reduced below a safe level: the low air warning light will come on first; if air pressure continues to drop, the parking brake valve will pop OUT, automatically applying the spring brakes. CAUTION: Do not try to put the vehicle in motion before pressure in the system reaches 100 psi (689 kPa) because the wheels are locked by the spring brake action. • Unnecessary stress and possible brake malfunction could occur if the vehicle is forced to move before the air system reaches 100 psi (689 kPa). • Below 60 psi (414 kPa) the parking brake valve button remains in the applied (ON) position. If air pressure is not restored, the button will automatically return to its initial position. Model 330 PB1318 3/01 – 73 –
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Operating Instructions<br />
(2) Trailer Air Supply<br />
Control (Red)<br />
(1) Parking Brake Control<br />
(Yellow)<br />
To release the trailer brakes ONLY:<br />
Using the Brake System<br />
• Push IN the Red knob on the dash. The truck or tractor<br />
will remain parked.<br />
To release the full combination of brakes:<br />
Combination (Tractor/Trailer) Parking Brake Control Valves<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 />
To release the truck or tractor parking brakes ONLY:<br />
02394<br />
• Push IN the Yellow knob on the dash. Your trailer will<br />
remain parked.<br />
Below 60 psi (414 kPa) the Yellow parking brake valve<br />
remains OUT (ON position). If air pressure is not<br />
restored above 60 psi (414 kPa), the knob will automatically<br />
return to the OUT position if you attempt to push it<br />
in. See page 25 for more information.<br />
• Push IN BOTH knobs on the dash.<br />
• In the event that air pressure is reduced below a safe<br />
level: the low air warning light will come on first; if air<br />
pressure continues to drop, the parking brake valve will<br />
pop OUT, automatically applying the spring brakes.<br />
CAUTION: Do not try to put the vehicle in<br />
motion before pressure in the system reaches<br />
100 psi (689 kPa) because the wheels are<br />
locked by the spring brake action.<br />
• Unnecessary stress and possible brake malfunction<br />
could occur if the vehicle is forced to<br />
move before the air system reaches 100 psi (689<br />
kPa).<br />
• Below 60 psi (414 kPa) the parking brake valve<br />
button remains in the applied (ON) position. If air<br />
pressure is not restored, the button will automatically<br />
return to its initial position.<br />
Model <strong>330</strong> PB1318 3/01 – 73 –