If your vehicle has a bad oxygen sensor, chances are it may cause you to fail an emissions check. Replace bad oxygen sensors and eliminate those codes.
This is the secondary air pump valve for E9x M3 with the S65 V8 engine. Over time carbon builds up inside the secondary air pump valve causing it not to close properly. This failure to close properly can allow exhaust and moisture to get past the valve and enter the secondary air pump, leading to premature pump failure.
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If your brake booster fails, stopping your car is not going to be an easy task, and would be a rather dangerous situation. Replace your brake booster at the first sign of failure and restore braking performance.
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