I have a Saab 9-5 Aero Estate (year 2000) with 105k miles on the clock. Recently the rear wheels have started to float on fast road ripples, small ridges, shallow holes etc. which would suggest the shock adsorbers need replacement.
However, the rear shocks control the car well on larger bumbs, and do not allow any bounce if you push down the back of the car. This indicates that the shocks are controling large movements, but suggests they are not controling the small movements.
Could this be wear in the rubber attachment bushes rather than the shock absorber itself, or is it a manifestation of shock adsorber failure.
I should add that the floating became more noticeable after the dealer determined (during a standard service) that some of the rear suspension bushes required replacement. Also that replacement of these bushes (on the control arms) did not have any affect on the problem at all.
Hope someone out there can help.
Martin