Steering caster,a caster wheel which can swivel. And change direction in any way.
by caster
Too much positive caster
Caster, Camber and Toe.
Positive caster, also known as caster angle, refers to the angle formed between the vertical line and the steering axis when viewed from the side of a vehicle. When the top of the steering axis is tilted toward the rear of the vehicle, it is considered positive caster. This design helps enhance stability, particularly at higher speeds, by ensuring that the wheels naturally return to a straight position after turning. Additionally, positive caster improves steering feel and responsiveness.
To answer in short, a negative caster in your alignment is if the steering pivot is positioned behind the wheel pivot. to visualize caster, just remember this. Positive caster = Shopping cart Negative caster = Bicycle
Caster, camber and toe.
The front suspension may have excessive positive caster.
The alignment angle called caster helps with steering wheel return.
Caster, camber and toe are part of the front end and steering alignment.
Toe: in or out. Chamber: positive or negative. Caster: measured in degrees.
Excessive caster is a drivability concern and will not cause tire wear. It will however cause instability in the steering. It will cause the steering to not automatically center after making a turn, and in server cases can cause the steering to be extremely sensitive and over-steer at the slightest input. This can be made worse by wheel shimmy. If caster is unequal from side to side, the the car will pull to the side that is most negative.
Caster adjustment can help compensate for road crown by altering the angle of the steering axis. By increasing positive caster, the vehicle's wheels can maintain better contact with the road, improving stability and steering response on a sloped surface. This adjustment aids in keeping the vehicle aligned and reduces the tendency to drift toward the lower side of the road. Proper caster settings can enhance overall handling and safety when driving on crowned roads.