The brief
The A4 came in for its scheduled service, and the owner asked us to look into poor handling and clunking noises from the undercarriage while it was in. Two jobs in one visit: the service, and tracking down that front-end clunk. A service runs through the whole car, and the inspection that comes with it found the cause of the noise: the front anti-roll bar drop links, the short rods with ball joints connecting the anti-roll bar to the front suspension. The ball joints wear, go loose, and knock over bumps, and a worn anti-roll bar link makes the handling feel vaguer too. So it was the service plus a drop link pair.
The diagnosis
The service check went through everything, and the undercarriage investigation pinned the noise. The engine oil and filter were due, the air and cabin filters near the end, a couple of fluids wanting topping, and the front anti-roll bar drop links had worn ball joints with play you could feel, the cause of the clunk and the vague handling. The rest of the suspension and the underbody checked out. So it was a service plus a front drop link pair: the wear items refreshed, the fluids freshened, new links.
The work
The engine oil and filter were changed, the air and cabin filters replaced, the fluids topped, and a full diagnostic scan run with no codes left. Both front anti-roll bar drop links were unbolted and removed, and a new pair of genuine Audi-spec links fitted, the ball joints torqued to the manual figures and seated properly. A road test confirmed a clean start, steady running, nothing leaking, the clunk gone, and the front end quiet and tight over bumps and through corners.
The outcome
A clean bill of health on the A4, fresh oil and filters, fluids topped, a clean scan, no more clunk from the front, and the handling tightened up on new anti-roll bar links. The car went home serviced and quiet. Catching the worn drop links during the service caught the noise and the vague handling while the car was in, so it left better in one visit.
