BRC 523840.04 – Low Voltage in Front Brake Pressure Sensor Circuit (50K Only). John Deere System Advisory.

BRC 523840.04 (BRC )

Code: 523840.04



Error code BRC 523840.04 occurs when the voltage at the front brake pressure sensor in vehicles equipped with a 50K capability falls below 0.20 volts. This low voltage is typically indicative of issues such as sensor failure, poor electrical connections, or a fault in the wiring or power supply to the sensor. Low voltage can result in unreliable brake pressure readings, potentially compromising the braking system’s effectiveness and safety.


Due to the low voltage detected at the sensor circuit, the function of the brake system is degraded. This condition impacts the reliability and precision of the braking system, potentially affecting the vehicle’s overall braking performance.


  • Inspect Sensor and Electrical Connections: Examine the front brake pressure sensor and its connections for signs of damage, corrosion, or looseness that might be causing the low voltage.
  • Measure Voltage Output: Use a multimeter to verify the voltage output at the sensor. This step will help isolate whether the issue is with the sensor itself or elsewhere in the electrical circuit.
  • Replace Faulty Sensor: If the sensor is found to be defective, replace it to ensure accurate monitoring of brake pressures.
  • Check Wiring and Circuitry: Evaluate all wiring and circuitry associated with the front brake pressure sensor to ensure there are no breaks or faults reducing voltage.
  • Calibrate and Test the System: After addressing the hardware issues, recalibrate the sensor to the manufacturer’s specifications and perform comprehensive testing to ensure the system operates correctly.


It is crucial to maintain the electrical integrity of sensors within the braking system to ensure they provide reliable data for safe operation. Regular inspections and timely intervention to correct low voltage issues in sensor circuits help ensure vehicle safety and prevent mechanical failures that could lead to accidents or system damage.