Cooper (R50) L4-1.6L (W10) (2002)
Vacuum Brake Booster: Testing and Inspection
Checking Brake Booster (Low-Pressure Test)
Special Tools Required:
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34 3 100
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Pull hose off connection and release from clip. Install vacuum tester 34 3 100 between connection and vacuum hose on non-return valve.
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Start engine.
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Check buildup of partial vacuum.
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Switch off engine.
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Press brake pedal to set a partial vacuum of no more than 0.8 bar and wait for value to stabilize.
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When the brake pedal is not pressed, the partial vacuum is allowed to drop by maximum 0.06 bar over a test period of 1 minute.
If specified values are not reached:
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Check line connections for vacuum seal.
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Replace vacuum non-return valve.
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Check seal between brake booster and brake master cylinder (sealing ring) for perfect condition and correct seating.
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If the specified values are not achieved during a repeated check, you must replace the brake booster.