Low Pressure Test
WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2006 BMW X5, 2005 BMW X5, 2004 BMW X5, 2003 BMW X5, and 2002 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
- Remove heater bulkhead. See HEATER BULKHEAD .
- Pull hose off connection. Install vacuum tester 34 3 100 between connection and vacuum hose on non-return valve. See Fig 1.
- Start engine and check buildup of partial vacuum. Stop engine.
- Press brake pedal to set a partial vacuum of no more than 11.6 PSI (.8 bar) and wait for value to stabilize.
- When the brake pedal is not pressed, the partial vacuum is allowed to drop by maximum .8 PSI (.06 bar) over a test period of 1 minute.
If specified values are not reached:
- Check line connections for vacuum seal.
- Replace vacuum non-return valve.
- Check seal between brake booster and brake master cylinder (sealing ring) for perfect condition and correct seating.
- If the specified values are not achieved when the test is repeated, you must replace the brake booster.
- After removing tester, reinstall heater bulkhead. See HEATER BULKHEAD .