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A FAW Volkswagen Bora 1.8 L comfort car with a mileage of about 160 thousand km in 2005. The owner reflected that there were some abnormal noises on the chassis part during normal driving. After receiving the car: according to the owner's reflection, the road test was carried out on the vehicle. The road trial found that the abnormal sound was the sound produced by the auxiliary brake vacuum pump for a long time.