Mercedes-Benz W639 front end rattle
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W639 rattles at the front on an uneven road or in a pothole: what is the fault?
The most common causes are the front bushings of the lower control arms, the tie rod end and the anti-roll bar rubbers. When the worn parts were replaced, the rattle stopped. Look for play with the car raised.
Can an anti-roll bar rubber cause a rattle?
Yes. Loose or worn anti-roll bar rubbers knock when one wheel drops into a pothole. Cheap aftermarket rubbers wear out quickly, so a quality part is worth it. Check the other joints and the brake caliper mounting at the same time.
How can you tell that the rattle is caused by a broken spring?
Signs of a broken front spring are a knock and the wing dropping lower. The broken end of the spring can damage surrounding parts, such as the ABS sensor. Have a workshop assess and repair the spring components.
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