John Deere 522279.13 – BRC, XMC / XSC: Secondary Brake Control Valve Not Calibrated

The control unit has detected that the calibration values for the secondary brake valve are missing or incorrect. This results in the disabling of the secondary brakes. While sometimes generically labeled as an 'Auxiliary System Fault', this code specifically points to a calibration or component issue within the secondary brake control system.

• 7630
• 7730
• 7830
• 7930
• 8130
• 8230
• 8330
• 8430
• 8530
• 9330
• 9430
• 9530
• 9630

1. 1

   Restart the tractor to see if the fault is a temporary communication glitch

2. 2

   With the vehicle in Park and the engine running, cycle the secondary brake lever and then restart the engine to attempt recovery

3. 3

   Check for low battery voltage, which can cause various electronic faults (reduce electrical load or increase engine RPM to test)

4. 4

   Check relevant fuses for the brake and steering control systems

5. 5

   Look for other active diagnostic trouble codes related to the BRC (Brake Control Unit) or XMC/XSC (Steering System Control Unit) controllers

1. 1

   Perform initial reset

   Attempt to clear the fault by restarting the tractor and cycling the secondary brake lever as outlined in the preliminary checks.

2. 2

   Calibrate secondary brake valve

   If the code persists, the secondary brake control valve must be calibrated. This procedure requires proprietary John Deere diagnostic software (Service ADVISOR™) and cannot be performed through the standard CommandCenter™ interface. Dealer intervention is required.

3. 3

   Replace or overhaul brake valve

   If a technician determines the brake valve or its components are physically faulty and will not accept calibration, overhaul the valve using a rebuild kit or replace the entire valve assembly.