Structure control principle and maintenance of brake system of Passat B5 car

Troubleshooting of Passat Brake System

1. The most common fault of the braking system is the ABS light alarm, and the V64 hydraulic pump is also faulty. This situation is mostly caused by poor contact of solder joints in ABS hydraulic pump circuit. Generally, it is only necessary to remove the computer board, make a small opening in the back and weld it again, and it is basically unnecessary to replace the ABS pump assembly.

2. Another fault is that the brake light is always on or off, mostly because the brake light switch is broken, and the EPC light of the electronic throttle control system is on, and the 17087 fault code can be called up in the engine control unit. Brake switches are F and F47(F is normally open and F47 is normally closed). F send signals to brake light, ABS and engine ECU; When closed; Meanwhile, F47 disconnects 15 from the power supply to the engine ECU. When the brake switch fails, the engine ECU gets an error message, and at the same time, the EPC light of the electronic throttle control system lights up and a fault code appears. For automatic cars, the brake light switch is broken, which will cause the shift lever position to be unable to move, because the automatic shift lock solenoid valve N 1 10 needs a brake signal. Here is a simple way to tell you that you can remove all the rear brake light bulbs (left, right and high brake light plugs) and move gears freely without stepping on the brake pedal. This method is also applicable to other Volkswagen cars (note: if the brake light is LED, it is not necessary to turn it off, because the diode resistance is much greater than the bulb resistance).