07/09/2026
🔧 Why Do You Feel Knocks in the Suspension When Driving Over Bumps?
When you drive over a pothole, speed bump, or rough road, the suspension system has to absorb the impact and control the movement of the wheel. A major component responsible for controlling this movement is the suspension bushing.
Suspension bushings are usually made from rubber or polyurethane and are installed between components such as the control arm and subframe. They allow controlled movement while reducing vibration, road shock, and noise from reaching the vehicle body.
When a bushing is in good condition, its rubber remains flexible and holds the suspension component firmly in position. As the wheel moves over a bump, the bushing flexes and absorbs part of the impact. This helps maintain stable wheel movement and provides a smoother, quieter ride.
However, as the bushing ages, it can become cracked, hardened, torn, or separated from its metal sleeve. Once this happens, excessive movement or play can develop between the suspension components.
When the vehicle hits a bump, the control arm may move farther than it should. That sudden movement can produce a knocking or clunking sound. You may also notice increased vibration, unstable or wandering steering, uneven tyre wear, or a loose feeling from the front end.
Worn bushings are not the only possible cause. Similar symptoms can come from worn ball joints, tie-rod ends, shock absorbers, suspension mounts, loose bolts, or damaged control arms.
If you hear repeated knocking over bumps, don't simply ignore it. A mechanic should inspect the suspension for excessive play, cracks, leaks, and loose components. After replacing suspension parts, a wheel alignment may also be necessary.
👉 Remember: A small suspension bushing can have a big effect on ride comfort, handling, tyre wear, and overall driving safety.
Dr.mechanics
