volvo Workshop Repair Guides

Volvo Workshop Service and Repair Manuals

Vacuum Brake Booster|Testing and Inspection|Page 8387 > < Vacuum Brake Booster|Testing and Inspection
Page 2
background image

-

Ignition off

-

Check the hoses and connections. Check for leakage

-

Before the next corrective action - wait approximately 3 minutes after switching the ignition off (system relay disconnected).

Pump the brake pedal a few times to that all negative pressure in the power brake booster disappears.
Check the function of the vacuum pump by pressing the brake pedal with the ignition on. The Vacuum pump should start and run for a few seconds to
build up a new vacuum and then stop.

Select an option:

1. The vacuum pump is functioning normally
2. The vacuum pump is operating constantly
3. The vacuum pump is not operating.

1 - Procedure complete

2 - Checking the wiring 1

3 - Checking the wiring 2

-------------------------------------------------

Checking the wiring 1

Vacuum Brake Booster|Testing and Inspection|Page 8387 > < Vacuum Brake Booster|Testing and Inspection