Commercial Driver Handbook ( PDF ) - California Department of ...
Commercial Driver Handbook ( PDF ) - California Department of ...
Commercial Driver Handbook ( PDF ) - California Department of ...
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suspension<br />
Springs/Air/Torque<br />
• Look for missing, shifted, cracked, or broken<br />
leaf springs (if 1/4 or more are missing or<br />
broken, it will put the vehicle out <strong>of</strong> service).<br />
• Look for broken or distorted coil springs.<br />
• If vehicle is equipped with torsion bars, torque<br />
arms, or other types <strong>of</strong> suspension components,<br />
check that they are not damaged and are<br />
mounted securely.<br />
• Air ride suspension should be checked for<br />
damage and leaks.<br />
• Axles secure<br />
• If retractable axle equipped, check condition <strong>of</strong><br />
lift mechanism. If air powered, check for leaks.<br />
Mounts<br />
• Look for cracked or broken spring hangers,<br />
missing or damaged bushings, and broken,<br />
loose, or missing bolts, U-bolts, or other axle<br />
mounting parts.<br />
Shock Absorbers<br />
• See that shock absorbers are secure and that<br />
there are no leaks.<br />
Note: Be prepared to perform the same suspension<br />
components inspection on every axle (power unit<br />
and trailer, if equipped).<br />
Brakes<br />
Slack Adjustors/Push-Rod<br />
• Check slack adjuster is securely mounted.<br />
• Look for broken, loose, or missing parts.<br />
• When the brakes are applied, the push rod<br />
from the brake chamber should not move more<br />
than two inches. (It is also acceptable to state<br />
that the angle between the push rod and the<br />
adjustor arm should be a little over 90° when<br />
the brakes are released, and not less than 90°<br />
when the brakes are applied.)<br />
Brake Chambers<br />
• See that brake chambers are not leaking,<br />
cracked, dented, and are mounted securely.<br />
• See that there are no loose or missing clamps.<br />
Brake Hoses/Lines<br />
• Look for cracked, worn, or leaking hoses, lines,<br />
and couplings.<br />
Brake Drums<br />
• Check for cracks or damage. Also check for<br />
loose or missing bolts.<br />
• Check for contaminants such as grease or oil<br />
on drums and linings.<br />
Brake Linings<br />
• Brake linings, where visible, should not be<br />
worn down dangerously thin.<br />
Note: Be prepared to perform the same<br />
brake components inspection on every<br />
axle (power unit and trailer, if equipped.)<br />
Wheels<br />
Rims, Rim Locks, or Slide Ring<br />
• Check for damaged or bent wheels or rims.<br />
• Wheels cannot have welding repairs.<br />
• Check that there are no rust trails that would<br />
indicate the wheel is loose.<br />
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