Download Audi Tt Brake Pressure Sensor Location So i decided to create one. Hot tip replacing the sensor is not difficult, but you will be opening the system and introducing air into it. MetalMan's 1.8T FrankenTurbo (F4H-L, F21) Build Thread ... from img.photobucket.com This sensor is integral to the abs/esp control module. Drain the brake fluid, and protect the bottom of the master cylinder, to prevent soiling unscrewing the sensors, with the remains of liquid remaining.