A quick check to see if the brake booster is working is to put your foot on the brake - without the engine running. Start the car, keep you foot on the brake and you should feel the pedal depress as the engine vacuum pulls the booster diaphragm.
Its not foolproof, but a general check only......
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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