Massey Ferguson 13.02.05 – TRANS1: Air Brake Park Brake Solenoid Issue

The control module has detected an electrical fault (such as an open circuit, short circuit, or abnormal amp draw) or a functional anomaly in the solenoid valve responsible for engaging and disengaging the air-actuated parking brake.

• 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
• Dyna 6
• Dyna VT
• 5600
• 5700SL
• 7600
• 7700
• 7614-7626
• 7714-7726

1. 1

   Locate the air brake park brake solenoid on the transmission/brake valve block and visually inspect the wiring harness and electrical connector for corrosion, frayed wires, or loose pins.

2. 2

   Use a multimeter to check the resistance of the solenoid coil and compare the reading against OEM specifications to determine if the coil is open or shorted to ground.

3. 3

   Turn the key on and probe the connector to ensure the TRANS1 module is sending the correct voltage to the solenoid when the park brake switch is toggled.

4. 4

   Verify that the park brake switch in the cab and the system pressure transducers are functioning correctly, as faulty inputs can cause the TRANS1 module to flag a solenoid output error.

1. 1

   Preparation

   Park the tractor on a flat, level surface. Crucial: Chock the wheels securely, as you will be disabling the parking brake system during the repair.

2. 2

   Disconnect Power

   Disconnect the negative battery cable to prevent electrical shorts and protect the TRANS1 module.

3. 3

   Locate and Remove

   Locate the faulty air brake park brake solenoid on the air brake control manifold.

4. 4

   Disconnect

   Unplug the electrical wiring harness from the solenoid.

5. 5

   Dismount

   Remove the retaining nut or mounting bolts holding the solenoid coil to the valve stem. If the entire valve assembly needs replacing, carefully unthread the valve body from the manifold (be prepared for residual air/hydraulic pressure release).

6. 6

   Install

   Install the new solenoid coil (or complete valve assembly) and tighten to the manufacturer's torque specifications.

7. 7

   Reconnect

   Plug the electrical connector back into the new solenoid.

8. 8

   Clear Codes

   Reconnect the battery, turn the ignition on, and use the onboard diagnostic display or a diagnostic tool to clear the 13.02.05 fault code from the TRANS1 module.

9. 9

   Test

   Start the tractor and cycle the park brake switch several times to ensure the air brake engages and releases properly without throwing a new code.