Massey Ferguson 13.03.49 – HITCH: Park Brake Wear Switch Not Opening Dyna 6 (HITCH)

The electronic switch responsible for monitoring the parking brake's status or wear limit is stuck in a closed state and is failing to open when the system expects it to. This can be caused by a failed switch, a short circuit in the wiring, or actual excessive mechanical wear in the parking brake assembly triggering the switch.

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5700 S / SL Series
• 5709 S
• 5710 S
• 5713 SL
• 6400 Series
• 6600 Series
• 6700 S Series
• 6713 S
• 6718 S
• 7600 Series
• 7614
• 7615
• 7619
• 7624
• 7626
• 7700 S Series
• 7714 S
• 7715 S
• 7726 S

1. 1

   Inspect the wiring harness between the park brake wear switch and the HITCH module for rubbed wires that may be shorting to ground.

2. 2

   Disconnect the switch and use a multimeter to test for continuity; if it remains closed at all times and never opens when manually actuated, the switch has failed internally.

3. 3

   Verify the physical condition of the parking brake components; if brake discs or pads are severely worn, the switch may be functioning exactly as designed to warn of mechanical failure.

4. 4

   Inspect the electrical connector at the switch for water ingress, dirt, or corrosion, which can bridge the pins and cause a false closed-circuit reading.

1. 1

   Secure the Tractor

   Park the tractor on a flat, level surface, turn off the engine, and securely block the wheels since you will be working on the parking brake system.

2. 2

   Locate the Switch

   Locate the park brake wear switch, which is typically mounted on the transmission housing near the park brake linkage or internal brake actuators on Dyna 6 models.

3. 3

   Disconnect Electronics

   Unplug the electrical connector from the switch.

4. 4

   Remove the Switch

   Unscrew or unbolt the faulty switch from its mounting bracket or housing.

5. 5

   Install the New Part

   Thread in the replacement switch and tighten it to the manufacturer's specified torque.

6. 6

   Adjust (If Applicable)

   If the switch relies on a bracket or linkage, ensure the adjustment bracket is set so that the switch makes and breaks contact at the correct pedal/lever travel limits.

7. 7

   Reassemble and Clear Codes

   Reconnect the wiring harness. Access the tractor's diagnostic interface (via the dashboard or a handheld diagnostic tool) to clear the 13.03.49 fault code.

8. 8

   Perform Mechanical Teardown

   If the switch was not the issue, you will need to drain the transmission/hydraulic fluid and perform a mechanical teardown of the parking brake assembly to replace worn friction discs.