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ESP brake pressure sensor, location / task / function - GF42.45-P-4900B

MODEL 163 up to 31.8.02 with CODE (472a) Electronic Stability Program (ESP) 

Locations of brake-pressure sensors within hydraulic system (schematic) 

Fig 1: Locations Of Brake-Pressure Sensors Within Hydraulic System
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  ESP brake pressure sensor, location   GF42.45-P-4900-02D 
  Task of ESP brake pressure sensor Monitors master cylinder pressures to determine driver demand. Generates an electrical signal, for pressure sensor 1 ESP (B34/1)  which corresponds to the pressure in the float circuit  and for pressure sensor 2 ESP (B34/2)  , reflecting the pressure in the control rod circuit  .  
  ESP brake pressure sensor, function Ceramic sensor element measures pressure of brake fluid. This metallic housing contains an electronic chip that transmits the pressure signal to the control unit as an analog voltage.