WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing/Installing Anti-Roll Bar From Control Arms
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove the nut. The ball joint must be locked using a Torx wrench
Remove the control arms from the anti-roll bar on both sides.