cdl b

Tires, wheels and rims.
Brakes.
Lights and reflectors.
Brake and electrical connections to trailer.
Trailer coupling devices.
Cargo securement devices

Too much or too little air pressure.

Bad wear. You need at least 4/32-inch tread depth
in every major groove on front tires. You need 2/32
inch on other tires. No fabric should show through
the tread or sidewall.

Cuts or other damage.

Tread separation.

Dual tires that come in contact with each other or
parts of the vehicle.

Mismatched sizes.

Radial and bias-ply tires used together.

Cut or cracked valve stems.

Re-grooved, recapped, or retreaded tires on the
front wheels of a bus are prohibited.

Damaged rims.

Rust around wheel nuts may mean the nuts are
loose--check tightness. After a tire has been
changed, stop a short while later and re-check
tightness of nuts.

Missing clamps, spacers, studs, or lugs means
danger.

Mismatched, bent, or cracked lock rings are
dangerous.

Wheels or rims that have had welding repairs are
not safe.

Cracked drums.

Shoes or pads with oil, grease, or brake fluid on
them.

Shoes worn dangerously thin, missing, or broken.

Missing nuts, bolts, cotter keys, or other parts.

Bent, loose, or broken parts, such as steering
column, steering gear box, or tie rods.

If power steering equipped, check hoses, pumps,
and fluid level; check for leaks.

Steering wheel play of more than 10 degrees
(approximately 2 inches movement at the rim of a
20-inch steering wheel) can make it hard to steer.

Spring hangers that allow movement of axle from
proper position

Cracked or broken spring hangers.

Missing or broken leaves in any leaf spring. If onefourth or more are missing, it will put the vehicle
"out of service", but any defect could be
dangerous.

Broken leaves in a multi-leaf spring or leaves that
have shifted so they might hit a tire or other part

Leaking shock absorbers

Torque rod or arm, u-bolts, spring hangers, or
other axle positioning parts that are cracked,
damaged, or missing.

Air suspension systems that are damaged and/or
leaking

Any loose, cracked, broken, or missing frame
members.

Loose, broken, or missing exhaust pipes, mufflers,
tailpipes, or vertical stacks.

Loose, broken, or missing mounting brackets,
clamps, bolts, or nuts.

Exhaust system parts rubbing against fuel system
parts, tires, or other moving parts of vehicle.

Exhaust system parts that are leaking.

Fire extinguisher(s).

Spare electrical fuses (unless equipped with circuit
breakers).

Warning devices for parked vehicles: three
reflective triangles or at least 6 fusees or 3 liquid
burning flares).

Tire Problems
Wheel and Rim Problems
Bad Brake Drums or Shoes
Steering System Defects
Suspension System Defects
Exhaust System Defects
Emergency Equipment.