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
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PREVENTIVE MAINTENANCE<br />
be performed by a qualified technician at an Authorized<br />
Service Center. The foundation brake system must be in<br />
proper working order to ensure the best ABS performance.<br />
CAUTION: Do not weld anywhere on the vehicle<br />
before detaching the ABS Electronic Control<br />
Unit (ECU) connector and all other<br />
electronic control units. Welding equipment<br />
can send an energy surge through electronic<br />
equipment and cause damage. Disconnect all<br />
ECUs before attaching welding equipment.<br />
CAUTION: Never detach the ECU connector<br />
with the ignition turned on. The connectors<br />
could arc and damage electronic equipment.<br />
Turn off the ignition before disconnecting any<br />
electronic equipment.<br />
Other precautions<br />
• Check ABS wiring harnesses periodically for chafing<br />
or other problems. No regular maintenance is<br />
required on 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><br />
Dealer or Authorized Service Center for information<br />
on clearing 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<br />
in the modulator assembly. The controller responds<br />
instantly by signaling the solenoids in the modulator which<br />
activate the air valves, reducing application pressure as<br />
needed to prevent the wheels from locking up. If this overriding<br />
correction is effective, application pressure is<br />
allowed to build up to the original input.<br />
Any malfunction of the anti-lock system on one or more<br />
axles will cause the system to fail-safe, and the panelmounted<br />
amber warning light will come on, indicating both<br />
a malfunction, and automatic shut-down of the system. If<br />
the foundation brake system is intact, the service brakes<br />
will continue to function normally, but without benefit of<br />
the anti-lock feature.<br />
<strong>Regional</strong> <strong>Haul</strong> (R05/10) Y53-6033 – 187 –
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