ASE G1 Auto Maintenance and Light RepairSuspension and SteeringMedium
A customer complains of a 'clunking' noise coming from the rear of their vehicle when going over bumps. A technician inspects the rear suspension and finds no obvious damage to the springs or shocks. Which of these components is MOST likely to be the source of the noise?
- AA seized wheel cylinder.
- BA worn stabilizer bar link.
- CA misaligned subframe.
- DAn overinflated tire.
Show answer & explanationAnswer & explanation
Correct answer: B. A worn stabilizer bar link.
Worn stabilizer bar links are a very common cause of clunking or rattling noises over bumps, as the worn bushings or joints allow the bar to move excessively. The other options are less likely to produce a distinct 'clunk' over bumps.
Why the other options are wrong
- A. A seized wheel cylinder would cause braking issues, not a clunking noise over bumps.
- C. A misaligned subframe is a significant structural issue that would manifest as handling problems and possibly continuous noise, not just clunking over bumps.
- D. An overinflated tire would cause a harsh ride but not typically a clunking noise.
Stabilizer Bar Link Noise
Worn or loose stabilizer bar links are a frequent cause of clunking or rattling sounds in the suspension, especially when driving over uneven surfaces.
- Connects the stabilizer bar to the control arm or strut.
- Contains bushings or ball joints that can wear out.
- Replacement often resolves suspension noise issues.
Memory trick: Clunking on bumps often means a link is loose.