Quick answer: A clunk or knock over bumps is most often a worn sway bar link, strut mount or control arm bushing. Bouncing after dips points to worn shocks or struts, a hum that rises with speed is usually a wheel bearing, and pulling or uneven tire wear points to worn steering or suspension parts plus alignment. North Jersey potholes wear these parts faster than most places.
1. Clunk or knock over bumps
Sway bar links are the most common cause: small parts with ball joints at each end that loosen with age. Worn strut mounts and control arm bushings make a deeper thud. This is rarely an emergency, but it gets louder and can lead to more wear.
2. Car keeps bouncing after a dip
Shocks and struts control how the springs move. When they wear out, the car floats, bounces and leans in turns. Worn struts also lengthen stopping distance and make the nose dive under braking.
3. Pulling or wandering
Worn tie rods, control arm bushings or ball joints let the wheel move when it should not. After any of those are replaced, an alignment sets the angles back to specification.
4. Uneven or cupped tire wear
Scalloped, cupped patches on the tread mean the tire is bouncing instead of staying flat on the road. Fixing the worn suspension parts protects your next set of tires.
Free suspension inspection in Wayne, NJ
RS Autowerks · 145 Garside Ave, Wayne, NJ 07470 · Mon–Sat 9 AM–5 PM
5. Humming or growling that changes with speed
A failing wheel bearing usually hums or growls and gets louder with speed, sometimes changing when you turn. It should be replaced before it develops play.
6. Steering feels loose or clunks when turning
Worn inner or outer tie rods, ball joints or a worn strut bearing can cause looseness or a clunk at low-speed turns. Worn steering parts should be fixed promptly.
7. Air suspension sagging overnight
On many BMW, Mercedes-Benz, Audi and Porsche models with air suspension, a corner that sags overnight usually means a leaking air spring or line, or a tired compressor. Catching it early protects the compressor.
How our free suspension inspection works
- We put the car on the lift and check shocks, struts, mounts, control arms, bushings, sway bar links, bearings and tie rods.
- We bounce test and road test it.
- You get a written quote showing what is worn, what can wait, and the exact price. No fee and no obligation.
Already have a big quote from a dealer or chain? Get a second opinion first; a “whole front end” quote often comes down to a couple of links. See our suspension repair service in Wayne, NJ.
New Jersey inspection does not check suspension
New Jersey passenger-car inspection has been emissions only since 2010, so worn suspension parts are not flagged by the state. You have to catch them yourself or with a shop inspection.
Frequently asked questions
What causes a clunking noise when going over bumps?
Most often a worn sway bar link, strut mount or control arm bushing. A lift inspection pinpoints which part is loose.
How do I know if my shocks or struts are bad?
The car keeps bouncing after a dip, leans heavily in turns, nose-dives when braking, or the tires show cupped wear. Leaking fluid on a shock or strut is another sign.
Is the suspension inspection free at RS Autowerks?
Yes. We put the car on the lift, road test it and give you a written quote with no fee and no obligation.
Do I need an alignment after suspension repair?
After replacing struts, control arms or tie rods, yes. We include it in the quote so there are no surprises.
Do you repair air suspension on German cars?
Yes. RS Autowerks services air suspension on BMW, Mercedes-Benz, Audi and Porsche models, along with conventional suspension on all makes.
Questions? Talk to a mechanic, not a call center.
RS Autowerks · 145 Garside Ave, Wayne, NJ 07470 · Mon–Sat 9 AM–5 PM
Written by Adam Jamhawi, owner of RS Autowerks in Wayne, NJ. Prices and policies are current as of October 2026; call to confirm for your vehicle.