If your vacuum pump is noisy then it is only a matter of time before it fails. Replace your 335d vacuum pump with this Vaico part. Fits US BMWs with the M57 diesel engine and some Euro models with the M47 diesel engine.
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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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