Remove the piston from the brake caliper
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Do not trap your fingers when the piston is pressed out.
Remove the dust cap before the piston is pressed out.
Place a block of wood in front of the piston. Carefully press out the piston using compressed air.