Vacuum pump and control valve, check: Preparations

Fig 1: Connecting Gauge 999 5230 To Valve In Socket Of Brake Booster

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove the control valve from the brake booster.

Connect gauge 9995230 to the valve in the socket of the brake booster.

Remove the vacuum line at the induction pipe. Plug the socket of the induction pipe.

NOTE: When the ignition is on (engine not started) and a vacuum is created, the electric auxiliary pump is activated. It runs only a few seconds due to the system relay.