Audi A4 sedan brake lights lit and can not be accelerated

       Approximately 143,000 km mileage Audi A4 sedan. Users report: car driving in the brake lights lit, and the acceleration difficult.
       Troubleshooting:
     (1) Failure Cause Analysis
     Brake light switch has hydraulic, pneumatic renault can clip V139 and mechanical car brake light switch is mechanical, brake lights lit the possible causes of failure are:
       1) brake light switch short-circuit fault.
       2) Improper brake light switch installation location.
       3) brake lights on the power supply lines are short-circuit fault.
     (2) Troubleshooting Methods
       Unplug the brake light wiring plugs, brake lights to go out, indicating that the brake lights on the power lines are not short-circuit faults. Remove the brake lamp obd news switch check, its continuity is good, it is judged as improper installation position of the brake light switch caused the brake light switch is always in the closed state.
      (3) failure treatment measures
        Reinstall the brake light switch, the contact length and the brake light switch and the brake pedal properly adjusted, the brake lamp switch contacts normally closed and disconnected troubleshooting.
        Failure Analysis: Due to improper brake light switch in position so that the brake lamp switch contacts are always in the closed state, the engine ECU get "auto brake" signal from the brake light switch terminal connections, the miscarriage of justice for the car in brake odometer correction tool deceleration conditions, engine speed and torque control, and thus the driver stepped on the accelerator pedal when the car you want to accelerate, the engine ECU will not consider accelerating the signal, and therefore appear brake lights lit, and the car can not accelerated failure phenomenon.
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