Low Pressure Test
WARNING: This page does not describe the selected car, but rather 92 other vehicles, including the 2002 BMW Z3, 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW Z3, and 2001 BMW M5. However, it is still accessible from the selected car via links, so may be relevant.
- Remove left microfilter for interior ventilation.
- 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, replace the brake booster.