Possible something is adrift or worn that is causing wheel alignment issues over ground that causes the suspension to move a lot, or when one wheel meets higher friction resistance.
We will assume the standard wheel alignments are good and no odd wear developing on the tyres.
First thing to do is a check the wheelnuts are tight, then bounce test to check for worn shock absorber and you can listen for any odd noises.
Then get hold of the wheels and first of all give them a good shake top to bottom and side to side, both on the ground and individually jacked up, an assistant to do the pushing and pulling whilst you check underneath would help, you are checking for loose or worn wheel bearings (so don't forget to spin the wheels whilst raised and gently rock them top to bottom feeling for wear), worn bushes and suspension/steering joints broken drop links that sort of thing you are looking for.
With wheels on the ground parking brake on, try to roll the car fowards or backwards by gripping the wheels hard and 'rolling' them each way, there should be little if any movement, this usually finds worn bushes quite effectively if anything is weak.
Whilst on the subject of parking brakes, Volvos up to around 2008/9 when EPBs arrived have a nasty habit of the parking brake shoe friction material (drum inside disc design) separating, the shoe material the floats around in the rear drum till eventually it picks up and can seize the hub solid, seeing as you have odd noises from the rear i'd be inclined to pull the discs/drums off and have a look to be on the safe side, surprisingly easy DIY, if new shoes are needed get new horsehoe clips too because they will have lost all their spring tension and be utterly useless at holding the shoes in place to the backplates...IMO they should have admitted this was a problem and refitted affected cars with redesigned brake shoes during service, its not an expensive nor time consuming job, easy DIY with a bit of nous.
Edited by gordonbennet on 28/11/2016 at 09:39
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