FCAR FD505 Wheel Alignment System User Manual
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2.7 Caster
The caster angle refers to the line connecting the top of the ball or the top of the strut
to the lower ball head (called the kingpin, the wheel rotates around when the car turns) and
the plumb line as viewed from the side of the car. When the upper ball idling behind the
plumb line, it is positive and vice versa.
2.7.1 Function
Affects steering stability and steering wheel automatic alignment capability.
2.7.2 Symptom judgment
➢
Caster angle too small caused instability: lack of steering wheel automatic alignment
ability after steering: when the vehicle speed is high, it will float (should pay full
attention to this when driving on the highway)
➢
Caster angle asymmetry caused deviation: when the left and right caster angle is not
equal and more than 30 (0.5'°), the vehicle will deviate, and the deviation direction
will be toward the smaller side of the caster angle.
