hi rear suspension became very bouncy, the front was fine, however i replaced both spheres on the rear and replaced a front to rear pipe as had small leak, upon finish and starting up the rear suspension is so soft i can easily lift up back and push down fully very easily where as the front has now become stiff and bouncy (front spheres not changed as were fine before) ive raised and lowered suspension several times in case air is in the front to rear pipe i replaced but no joy,, going to bleed rear brakes 1st even though they work fine, any suggestions on cause before i buy new front spheres as i beleve they ok