Lemforder TRAILING ARM MOUNTI
FRONT UPPER Sachs part number 2590901

A castor arm in a car is an important component that plays a significant role in the suspension system of the vehicle.

The caster arm is located between the lower ball joint and the steering knuckle. Its primary function is to enable the wheel to maintain proper wheel alignment while driving at high speeds. The caster angle is the angle created by a line that runs through the upper and lower ball joints and the vertical axis of the tire. The caster arm affects this angle by allowing the wheels to tilt inwards or outwards. This, in turn, affects the handling and stability of the car. When the caster angle is correctly adjusted, the car's steering will be much more responsive, and it will be easier to maintain control at high speeds. However, if the caster angle is too steep or too shallow, it can cause uneven tire wear, reduced stability, and poor handling, which can ultimately lead to unsafe driving conditions.