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Usually you can tell shocks are gone if they can't dampen a number of consecutive bumps. The job of a shock absorber is to let the wheel comply with a bump and then get the rubber back down on the road as quickly and smoothly as possible. Kind if what admranger is saying but at a much more streetable application.....basically it you hit a bump, the car should absorb it and compose itself straight away. If you're steel feeling the up and down after you're well past the bump, that's when you know they're shot.
Or, in Oz at least, we have shops that do a free suspension check. They put the car on a suspension dyno, basically four plates under the tyres that shake the wheels up and down rapidly - they map the response of the shocks, and give you a printout of acceptable vs your cars performance - that's a more scientific approach.
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2005 3.0d Sport - Sapphire Black
Engine : Bluefin Superchip Tune,
Wheels & Sus: Style 168s (10.5s all round), H&R RDA Spacers, Bilstein B12, Eibach 40mm drop, Whiteline RSB
Exterior: Le Mans flares, 4.6is kit F&R
Interior: Dynavin N6, Blackvue DR650 dash cams
My Build Thread: http://www.xoutpost.com/bmw-sav-foru...run-sheet.html
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