Inspect for mismatched or uneven tires.

Replace the tires.

Inspect for a broken or a sagging spring

Replace the spring.

Inspect for a radial tire lateral force.

Check the wheel alignment. Switch the wheels. Replace the tires as needed.

Check the front-wheel alignment.

Align the front wheels.

Inspect for an off-center steering gear.

Reseat the pinion valve assembly. Replace the pinion valve assembly as needed.

Inspect for front-brake dragging.

Adjust the front brakes.