CLAAS 7638h – TR2 (A57-2): Brake Pressure Sensor B233 Disconnected

The transmission control module has detected a fault related to the high-pressure braking circuit. Specifically, the system has registered a disconnection or malfunction involving the brake pressure sensor (B233) or its wiring. The system prompt 'Pump for 15 seconds. Start the tractor. braking.' indicates a required reset or initialization procedure for the braking system.

• Axion 800
• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Arion 510
• Arion 640

1. 1

   Visually inspect the brake pressure sensor (B233) on the conjoncter/breaker for physical damage, corrosion, or fluid leaks

2. 2

   Check electrical connectors and the wiring harness between the pressure sensor (B233) and the TR2 (A57-2) control module for loose connections, damaged wires, or moisture ingress

3. 3

   Verify that the sensor is receiving the correct voltage power supply and has a solid ground connection

4. 4

   Test the wiring harness for continuity to identify open circuits, and test for short circuits between the signal wire and ground or power

5. 5

   Use CLAAS METADIAG© or CLAAS Diagnostic System to monitor real-time pressure readings from the B233 sensor to determine if the signal is missing, erratic, or out of range

1. 1

   Repair wiring and connections

   If diagnostic checks reveal wiring or connector issues, repair or replace the damaged components. Ensure all connections are clean, dry, and secure. Clear fault codes and operate the tractor to see if the fault returns.

2. 2

   Replace brake pressure sensor

   If the wiring and connections are confirmed to be in good condition but the diagnostic tool indicates a faulty sensor (no signal or inconsistent readings), replace the brake pressure sensor (B233).

3. 3

   Re-evaluate and calibrate system

   After repairs, clear the fault codes using a diagnostic tool. Start the tractor and operate the braking system to ensure the fault does not reappear. Perform any system calibration or initialization as prompted by the onboard diagnostics (e.g., 'Pump for 15 seconds. Start the tractor. braking.').