Probabaly means rear trailing arm bearings !!
Leave the car in normal running height.
Stand well back from the rear of the car and look at the rear wheels.
They should be upright.
If they are leaning, in at the top, out at the bottem, then the rear
arm bearings are worn.
Look at the rear tyres, the inside edges take the brunt of the deal.
Sometimes this can be heard as a crack as the car goes up and down at
the back (sometimes they are silent but still worn)
It is usualy false economy to fit a new set of bearings, as the seat in
the arm will have turned egg shaped, as we all know, you cant put a
round peg in a square hole.
Pleiades sell a recon arm ready to fit, these are oil filled and the
bearings will last out the rest of the car.
www.citroen-hydraulics.com their new web site I think still under