What is the role of caster angle in steering?

The role of caster angle in steering is primarily associated with increasing steering responsiveness. The caster angle is the angle created by the steering axis when viewed from the side of the vehicle. A positive caster angle means that the steering axis is tilted towards the driver, which helps to create a self-centering effect in the steering system. This self-centering characteristic allows the vehicle to return to a straight path more easily after turning, thereby enhancing overall steering responsiveness.

When the caster angle is properly set, it assists in directional stability, which improves the driver's ability to manage the vehicle dynamically, especially at higher speeds or during cornering. This improved handling characteristic is a direct result of how the casters interact with the road surface, allowing for a more immediate response to steering inputs.

While the other options may reflect legitimate aspects of vehicle performance and maintenance, they do not specifically tie back to the primary function of caster angle in steering systems. For example, braking efficiency is largely influenced by other factors such as brake components and tire grip, while wheel alignment and tire wear are more directly related to camber and toe angles rather than caster.