You must notice excessive lash or free play which may indicate a defect in?

The presence of excessive lash or free play can be an important indicator of a defect in the steering system of a vehicle. When there is excessive play in the steering, it can lead to a lack of responsiveness when the driver turns the steering wheel. This can be particularly dangerous while maneuvering, as it can result in a delayed or unpredictable response from the front wheels.

In a well-functioning steering system, the connections and components must work tightly together to ensure that any movement of the steering wheel translates directly to movement of the vehicle's wheels. Excessive lash or free play might suggest that there are worn or damaged components such as tie rods, steering gears, or bushings. Neglecting to address these issues can compromise vehicle safety and handling.

The other options relate to different systems: brake chambers deal with the braking system, suspension concerns the vehicle's stability and comfort, and tire tread impacts traction and braking but does not directly connect to steering response and control. This distinction highlights why excessive lash or free play is specifically associated with the steering system.