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How can I correct a knock or "bump" on driver's side when in reverse?

I have a 1993 Citroen ZX with almost 200,000 miles. Almost every time I reverse the car, there is a loud knocking sound. Lately, it has become louder. Is this a problem with the universal joint? So far, my mechanic has not been able to locate the problem. Can you help.
Des Biggs, May 2007
Yes definatly a problem with 1 of the driveshafts, maybe a new 1 or some lubrication on the inside of the joint might fix the problem. I get that sound while going round corners in my saxo.

Cheers carl

Carl, June 2007
it will be the rear radius arm bearings probably not worth doing due to labour costs.

martin, May 2007
link Click here to see other fixes for Citroen.