Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
Peterbilt Medium Duty Trucks Operator's Manual after 1-07
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Preventive Maintenance<br />
• Do not use pressure-release grease fittings when lubricating<br />
the slack adjuster.<br />
Checks and Adjustments<br />
All vehicle operators should check the brakes regularly.<br />
Always adjust the brakes when they are cool.<br />
• Park the vehicle on a level surface and block the wheels<br />
before attempting any brake checks or adjustments.<br />
Brake Linings<br />
WARNING! Do not use brake linings with a thickness<br />
below the specified minimum. Such linings<br />
will have lining rivets exposed that can damage<br />
the brake drum and reduce brake efficiency,<br />
which could cause an injury accident or system<br />
failure.<br />
• Brake linings should be inspected for wear by a qualified<br />
mechanic at an Authorized Service Center. See Table 3,<br />
“Maintenance Schedule,” Page 123. In severe service<br />
applications inspect the linings more frequently.<br />
Automatic Slack Adjusters<br />
Brake System<br />
Your <strong>Medium</strong> <strong>Duty</strong> is equipped with automatic brake (slack)<br />
adjusters.<br />
Periodically, brake adjustment should be checked using<br />
the following procedure:<br />
1. Check brakes when the temperature of the service brake<br />
linings are cool and the system air pressure is at 100 psi<br />
(690 kPa) minimum.<br />
2. Release the parking brakes to allow the slack adjusters<br />
to retract.<br />
3. Measure the retracted pushrod length from the face of<br />
the brake chamber to the center of the pushrod pin.<br />
4. Apply 80 to 90 psi brake application and measure the<br />
same distance.<br />
5. The difference is the pushrod travel distance (applied<br />
stroke).<br />
Verify that the result is within the correct range (see Table 5,<br />
”Brake Adjuster Stroke”). Correctly installed and functioning<br />
brakes (auto slack) will produce the strokes listed for each<br />
chamber type.<br />
<strong>Medium</strong> <strong>Duty</strong> (R10/06) Y53-6008 – 151 –