Automotive Service Technician Period 1 Practice Exam

Which option would move camber more positive on the rear when using a shim?

Move top of strut rearward Lengthen front strut rod Shim with thickest portion at the top Lower ride height

Correct Answer:

Shim with thickest portion at the top

Explanation:

Camber is the tilt of the wheel relative to vertical, and it can be adjusted by changing the angle of the strut mounted to the wheel hub. A shim that is thicker at the top acts as a wedge between the top strut mount and the body, forcing the top of the strut to sit higher relative to the bottom. This tilts the wheel plane so the top leans outward, yielding more positive camber at the rear. Other options either shift the mounting in ways that don’t directly create positive camber with a shim, or affect overall geometry in less targeted ways. So using a shim with the thickest portion at the top directly increases rear camber in the positive direction.

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