Steering and Suspension Systems Flashcards

A truck driver complains of a steering wheel that pulls to one side only during braking. Which component is MOST likely the cause?

Answer: Seized or dragging brake caliper on one side

A brake caliper that drags on one side creates uneven braking force, pulling the vehicle toward that side only during braking.

What is the purpose of the track bar (Panhard rod) on a solid front axle suspension?

Answer: Limits axle lateral (side-to-side) movement

The track bar restrains lateral movement of the solid axle, keeping it centered under the vehicle.

When inspecting a recirculating ball steering gear, which measurement confirms internal wear?

Answer: Steering wheel free-play exceeding manufacturer specs

Excessive steering wheel free-play (lash) at center position indicates worn internal components in a recirculating ball gear.

A coach experiences excessive body lean in corners. The air suspension ride height is correct. Which component should be inspected FIRST?

Answer: Stabilizer bar and end links

The stabilizer (sway) bar resists body roll; worn or disconnected end links allow excessive lean even when ride height is correct.

Camber angle is described as positive when:

Answer: The top of the wheel tilts outward away from the vehicle centerline

Positive camber means the top of the tire leans outward (away from the vehicle), while negative camber means the top leans inward.

Which condition would MOST likely cause cupped (scalloped) tire wear on a steering axle?

Answer: Worn or weak shock absorbers

Worn shock absorbers allow the tire to bounce and skip on the road surface, creating the scalloped wear pattern.

A technician is setting front toe on a Class 8 truck. After adjustment, the toe should be verified with the vehicle:

Answer: On a flat, level surface with the vehicle at proper ride height and steering centered

Toe must be set with the vehicle at proper ride height on a flat surface and the steering centered to reflect actual operating conditions.