ASE A4 Suspension and SteeringWheels and Tires Diagnosis and RepairMedium
A technician is inspecting a vehicle with a clunking noise and excessive play when wiggling the wheel at the 12-6 o'clock positions. The 3-9 o'clock movement is normal. This indicates a problem with the:
- ASteering rack
- BTie rod ends
- CWheel bearing
- DBall joints
Show answer & explanationAnswer & explanation
Correct answer: D. Ball joints
Excessive play when moving the wheel at the 12-6 o'clock positions, with normal 3-9 o'clock movement, is a classic indication of worn upper or lower ball joints. This movement isolates vertical play in the suspension.
Why the other options are wrong
- A. A worn steering rack would show play at the 3-9 o'clock positions, similar to tie rod ends, but within the rack itself.
- B. Worn tie rod ends would typically show excessive play at the 3-9 o'clock positions.
- C. A worn wheel bearing typically causes play at both 12-6 and 3-9 o'clock positions, or a rotational looseness.
Ball Joint Play Diagnosis
Diagnosing ball joint wear involves checking for play by wiggling the wheel. Excessive movement at 12-6 o'clock positions (vertical plane) indicates worn ball joints.
- 12-6 o'clock movement checks vertical play.
- Ball joints allow vertical articulation of the suspension.
- Excessive play indicates worn ball joint(s).
- Can cause clunking noises and unstable handling.
Memory trick: 12-6 is vertical, like a ball joint's fall. 3-9 is horizontal, like a tie rod's call.