BRC 523787.04 – Low Solenoid Supply Voltage for Brake Cooling. John Deere System Advisory.

BRC 523787.04 (BRC )

Code: 523787.04



Error code BRC 523787.04 is identified when the unswitched supply voltage to the Brake Cooling Solenoid in the Brake Control Unit (BRC) falls below 9.0 volts. This low voltage condition can impair the operation of the solenoid, which is critical for controlling the flow of coolant to the brakes, thus potentially affecting the effectiveness of the brake cooling system.


The response from the control unit to this low voltage issue is a degraded function, where the brake cooling system may not operate at its optimal capacity, potentially leading to reduced braking efficiency and increased wear due to higher operating temperatures.


  • Inspect Battery and Charging System: Ensure that the vehicle’s battery and charging system are functioning properly to maintain adequate voltage levels. Check for old or weak batteries that might need replacing.
  • Check Electrical Connections: Examine all electrical connections to the Brake Cooling Solenoid for corrosion, looseness, or damage that could be causing voltage drops.
  • Test Voltage Levels: Use a multimeter to measure the voltage supply directly at the solenoid and compare it to required specifications to pinpoint areas of voltage loss.
  • Replace or Repair Faulty Components: If specific components are identified as faulty, causing the low voltage issue, replace or repair these to restore proper operation.
  • Monitor System After Repairs: After making any necessary repairs or adjustments, closely monitor the system to ensure that it maintains the correct voltage and that the brake cooling system functions correctly.


Maintaining proper voltage levels is essential for the reliable operation of the brake cooling system. Regular checks and maintenance of the electrical supply, connections, and related components can help prevent issues that might lead to system degradation and ensure the braking system operates efficiently under all conditions.