34 00 017 Checking brake booster (low-pressure test)
WARNING: This page is about a different car, the 2008 MINI Cooper, 2007 MINI Cooper, 2006 MINI Cooper, and 2005 MINI Cooper. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
For Special Tool identification, see BRAKES - SPECIAL TOOLS - COOPER (1.6L) R50/W10 .
Special Tools Required:
- 34 3 100
- Release clamp and detach vacuum hose. Connect vacuum tester 34 3 100 between connection and vacuum hose at non-return valve.
- Start engine.
- Check whether a vacuum forms.
- Switch off engine.
- Depress brake pedal to set a maximum value of 0.8 bar and wait until the value stabilizes.
- When the brake pedal is not depressed, the vacuum may drop by a maximum of 0.06 bar within a test period of 1 minute.
If the specified values are not reached:
- Check line connections for leaks.
- Replace non-return valve.
- Check that seals between brake booster and brake master cylinder (sealing ring) are in perfect condition and that seal seating is correct.
- Replace the brake booster if the specified values are still not reached after repeating the test procedure.