Massey Ferguson 13.03.06 – TRANS1: Air Brake Park Brake Solenoid Issue

Malfunction, electrical fault (such as an open circuit, short circuit, or abnormal amp draw), or communication failure involving the solenoid responsible for actuating or releasing the pneumatic park brake system on the tractor.

• 7724S
• 5712SL
• 7722S
• 7722
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 4707
• 4708
• 4709
• 4710
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Inspect the wiring harness running from the TRANS1 module to the air brake park brake solenoid. Look for chafed wires, melted insulation, or pinched lines. Check the solenoid connector for water ingress, corrosion, or pushed-out pins.

2. 2

   Using a multimeter, measure the resistance across the pins of the park brake solenoid coil. Compare the reading to OEM specifications to determine if the coil is internally shorted or open.

3. 3

   Back-probe the connector and cycle the park brake switch in the cab to verify that the TRANS1 module is sending the correct voltage/signal to the solenoid.

4. 4

   Verify that the tractor's air brake system is building and maintaining proper pressure, as low system pressure can sometimes trigger secondary solenoid or park-lock faults.

1. 1

   Safety First

   Park the tractor on a flat, level surface. Chock the wheels securely, as you will be working on the park brake system. Disconnect the negative battery cable.

2. 2

   Depressurize the System

   Bleed the air from the pneumatic brake circuit to ensure there is no residual pressure when removing the valve.

3. 3

   Locate the Solenoid

   Locate the air brake control valve block (typically mounted near the transmission housing or rear axle, depending on the specific model).

4. 4

   Disconnect

   Carefully unplug the electrical connector from the park brake solenoid.

5. 5

   Removal

   Remove the retaining screws or snap ring holding the solenoid coil to the valve stem. Slide the faulty solenoid off. (If the entire valve assembly is faulty, disconnect the air lines and unbolt the valve block).

6. 6

   Installation

   Slide the new solenoid onto the valve stem and secure it with the retaining hardware.

7. 7

   Reassembly

   Reconnect the electrical connector. Reconnect the battery.

8. 8

   Testing

   Start the tractor, allow the air system to build pressure, and cycle the park brake multiple times. Use a diagnostic tool to clear the 13.03.06 code from the TRANS1 module and verify it does not return.