Checking the ABS hydraulic modulator
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.
Check that the new ABS hydraulic modulator is the correct type depending on whether the car is equipped with STC (stability and traction control) or not.
An ABS modulator for ABS has only eight valves while an ABS modulator for ABS and STC (stability and traction control) has ten valves.
WARNING:
Never, under any circumstances,
open the ABS hydraulic modulator. Reassembling it requires special equipment and facilities.