Lets make sure your replacing the correct item. If the actuator ( the item that replaces a normal shock absorber) is leaking then it needs replacing. If is not leaking then it is OK. What will give you the knocking sound as a bad accumulator.
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1B81CZ6JA&year=1984&make=MB&model=300-TDT-001&category=L&part=Accumulator
These are the units that absorb the shock of the road. I would suggest replacing them in pairs. Not 100% required. But if he has the car up on a jack and has opened the system you might as well do it.
Also have the fuild filter and fluid flushed. The filter is in the reserviour and should be replaced.
Also check the mounts on the actuator. It could be loose. Check the trailing arm stops located at the trailiing arm subframe mounts.
Dave
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1970 220D, owned 1980-1990
1980 240D, owned 1990-1992
1982 300TD, owned 1992-1993
1986 300SDL, owned 1993-2004
1999 E300, owned 1999-2003
1982 300TD, 213,880mi, owned since Nov 18, 1991- Aug 4, 2010 SOLD
1988 560SL, 100,000mi, owned since 1995
1965 Mustang Fastback Mileage Unknown(My sons)
1983 240D, 176,000mi (My daughers) owned since 2004
2007 Honda Accord EX-L I4 auto, the new daily driver
1985 300D 264,000mi Son's new daily driver.(sold)
2008 Hyundai Tiberon. Daughters new car
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