PART 8: MAINTENANCE AND SERVICE
PB1319 (CAT. NO. 5296 ) —130— 22-01691 (R02/02)
Type 16, 20, & 24 chambers (front brakes) should have a 1 inch to
1 3/4 inch (25.4 mm to 44.4 mm) stroke.
If the stroke exceeds the above specifications, check to verify that the
slack adjuster is working.
• With the air system at 100 psi (690 kPa) or more, apply the brake.
If adjustment is necessary and the slack adjuster is working, the
adjusting hex nut will rotate during the chamber return stroke. Install-
ing a wrench on the hex nut will make this easier to see. On each
stroke after the first, the amount of adjustment and chamber travel will
be less.
Tires, Wheels, And Rims
Tires
Your tires are a very important part of your vehicle’s whole braking
system. How fast you can stop depends in large measure on how
much friction you get between the road and your tires.
In addition, keeping your tires in good condition is essential to the
safe, efficient operation of your vehicle. Regular, frequent inspection
and the right care will give you the assurance of safe and reliable tire
operation. Here are some tips on maintaining your tires.
1. Underinflated Tires. Low pressure is a tire’s worst enemy. Under-
inflation allows tires to flex improperly, causing high temperatures
to build up. Heat causes early tire damage such as flex break,
radial cracks, and ply separation. Low pressure may affect control
of your vehicle, especially at the front wheels. Most tire wear
problems are caused by underinflation as the result of slow leaks,
so you’ll want to check tire pressure regularly.
Checking Inflation Pressure
Give tires a visual test daily, and check inflation with a gauge weekly.
• When checking tire pressure, inspect each tire for damage to side-
walls, cuts, cracks, uneven wear, rocks between duals, etc. If a tire
appears underinflated, check for damage to the wheel assembly.
WARNING! Underinflated tires could cause a serious
accident. The extra heat caused by underinflation can
cause sudden tire failure. Low pressure may affect con-
trol at the front wheels. You could be seriously hurt in
an accident that could result. Keep your tires inflated to
the manufacturer’s recommended limit.
WARNING! You can be badly injured trying to fix tires.
Don’t mount or dismount a tire yourself; have any wheel
service performed by an expert. And stand away from
the tire assembly while the expert is working.
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