Symptoms
- Loud bang, more forceful than a typical clunk, over speed bumps or dips
- Noise happens with larger bumps, not small ones
- Ride may feel harsher overall
Likely causes
- CommonWorn or missing bump stopThe rubber bump stop cushions the suspension at the end of its travel; when worn or missing, metal parts can contact directly.
- CommonFailing strut or shock allowing full compressionA worn shock or strut may let the suspension bottom out more easily, causing a hard bang.
- PossibleBroken springA broken spring can allow harsh contact between components on a big bump.
What to do
- Inspect the suspension for a visible bump stop (a small rubber piece near the strut) and check if it's cracked, crumbling, or missing.
- Do a bounce test on the affected corner to check for excessive travel or bottoming out.
- Check the coil spring for visible damage or breaks.
- Have a mechanic inspect struts, springs, and bump stops together, since a bang like this often involves more than one worn part.
- Replace the worn bump stop, strut, or spring as identified.
Tools and parts
Bump stopSearch: “suspension bump stop for [your car model]”
Strut assemblySearch: “strut assembly for [your car model]”
When to call a pro
A mechanic can inspect the bump stops, struts, and springs together on a lift to find exactly what's making contact.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.