A passageway with a mileage of about 140 thousand km, equipped with BBG engine in 2007, Passat control V6 automatic car. Users reflect: the car ABS, electronic stability control system (ESP) fault lights are lit, and the brake pedal on low speed is abnormal. Inspection and analysis: the maintenance personnel commissioning test found that when the ABS and ESP fault lights were extinguished, the vehicle could feel vibration when the vehicle speed was below 30km/h. This is actually the performance of ABS when it comes into effect. According to experience, it is the abnormal noise reflected by users.