Knocking Noise When Going Over Bumps? Here Is What It Could Be

Your suspension takes a pounding

Your suspension keeps the tyres pressed on the road and soaks up the lumps so you do not feel them. It is made up of springs, shock absorbers, arms and joints, with rubber bushes cushioning the points where metal meets metal.

Every pothole and speed bump puts a load through those parts, and the roads around Walsall give them plenty of practice. Over time joints loosen and rubber perishes, and that is when the knocks and clonks start.

Drop links and anti-roll bar bushes

One of the most common causes of a knock is a worn drop link. These are short rods that connect the anti-roll bar to the suspension, and they have small ball joints at each end that wear out.

A worn drop link usually makes a light knock or rattle over small bumps and uneven roads, often at low speed. The car may still feel fine to drive, but the noise tends to get worse. The rubber bushes that hold the anti-roll bar to the car can make a similar sound when they wear.

Ball joints, arm bushes and top mounts

Each front wheel pivots on a ball joint at the bottom of the suspension. When it wears, you may hear a clunk over bumps or when braking, and the steering can feel vague or wander. A badly worn ball joint is a safety issue, because it holds the wheel in place.

The large rubber bushes in the suspension arms can split and let the arm move, giving a dull thud and sometimes a shimmy under braking. Top mounts, which sit at the top of the front suspension, can knock or creak when you turn the steering, especially on full lock.

Broken springs and tired shock absorbers

Coil springs can snap, usually right at the bottom coil, and potholes are often the final straw. You might hear a loud clunk, notice one corner sitting lower than the others, or hear a scraping noise as the broken end rubs. A broken spring is an MOT fail and can damage the tyre if it touches it.

Worn shock absorbers do not always knock, but they let the car bounce and float after a bump and can make it feel unsettled on fast bends. Look for oil on the outside of the shock, or press down hard on one corner and see whether the car bounces more than once.

Why it is worth getting checked

A knock is the car telling you something has worn. Left alone, worn parts can wear the tyres unevenly, throw the alignment out and make the car less stable when you brake or swerve.

It is not always the suspension either. Loose heat shields, exhaust hangers and even items rolling about in the boot can sound alarmingly similar. That is why we check on the ramp rather than guess.

If you can, make a note of when the noise happens before you bring the car in. Is it over speed bumps, when turning, when braking, or only on rough roads? Does it come from the front or the back, and which side? Those details help us go straight to the right area and save time on the ramp.

Book a suspension check in Pelsall

We lift the car, check every joint and bush by hand, and find the part that is actually making the noise. We will show you what is worn, tell you what is urgent and what can wait, and give you a clear quote before any work starts.

Call us on 01922 682200 or book online, and bring it down to 45 High Street, Pelsall.