Checking the Brake Servo Valve

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: Identifying Hose Pliers And Brake Servo Valve

Courtesy of VOLVO CARS OF NORTH AMERICA.

Additional work for checking the T-valve

Remove the hose pliers 1158957 .
Plug the open connection of the T-valve.

Blow in the intake manifold side. If it is not possible to blow through, the valve is OK.
Suction the intake manifold side. If it is possible to suction air through, the valve is OK.

If the results are not satisfactory, replace the brake servo valve.