MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
MODEL 330 OPERATOR'S MANUAL - Peterbilt Motors Company
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Preventive Maintenance<br />
Anti–Lock Braking System (ABS)<br />
Your Model <strong>330</strong> is equipped with an anti-lock braking system.<br />
For detailed service information, see the <strong>Peterbilt</strong> Medium<br />
Duty Maintenance Manual. All service work should be performed<br />
by a qualified technician at an Authorized Service<br />
Center. The foundation brake system must be in proper working<br />
order to ensure the best ABS performance.<br />
CAUTION: Do not weld anywhere on the vehicle<br />
before detaching the ABS Electronic Control Unit<br />
(ECU) connector and all other electronic control<br />
units. Welding equipment can send an energy<br />
surge through electronic equipment and cause<br />
damage. Disconnect all ECUs before attaching<br />
welding equipment.<br />
CAUTION: Never detach the ECU connector with<br />
the ignition turned on. The connectors could arc<br />
and damage electronic equipment. Turn off the<br />
ignition before disconnecting any electronic<br />
equipment.<br />
Other precautions<br />
• Check ABS wiring harnesses periodically for chafing or<br />
other problems. No regular maintenance is required on<br />
the ABS components.<br />
Brake System<br />
• During wheel balancing, dyno testing, or any time the<br />
ignition is on with part of the ABS disconnected, a failure<br />
code will be recorded. Consult with your <strong>Peterbilt</strong> Dealer<br />
or Authorized Service Center for information on clearing<br />
the failure code.<br />
If, due to operating conditions, a brake application causes<br />
either wheel on the same axle to begin skidding, wheel<br />
speed sensors immediately signal the anti-lock controller in<br />
the modulator assembly. The controller responds instantly by<br />
signaling the solenoids in the modulator which activate the air<br />
valves, reducing application pressure as needed to prevent<br />
the wheels from locking up. If this over-riding correction is<br />
effective, application pressure is allowed to build up to the<br />
original input.<br />
Any malfunction of the anti-lock system on one or more axles<br />
will cause the system to fail-safe, and the panel-mounted<br />
amber warning light will come on, indicating both a malfunction,<br />
and automatic shut-down of the system. If the foundation<br />
brake system is intact, the service brakes will continue to<br />
function normally, but without benefit of the anti-lock feature.<br />
Model <strong>330</strong> PB1318 3/01 – 161 –