Check disc surface

WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Compression Of Brake Caliper Piston

Courtesy of VOLVO CARS OF NORTH AMERICA.

Check brake disc friction surface.
If brake disc shows signs of being skew, check its lateral run-out as per Measuring lateral run-out on brake disc .
If brake disc shows signs of major wear, variations in thickness etc., replace it as per Brake disc rear, replacement .

NOTE:

disc thickness = replacement point = 23.0 mm (0.9"). Minimum recommended disc thickness when installing new brake pads = 23.8 mm (0.94").