Massey Ferguson 13.00.49 – HITCH: Park Brake Wear Switch Not Opening Dyna 6 (HITCH)

The electronic control system is detecting that the park brake wear switch (or indirect switch) is remaining in a closed state (continuity present) when the system logic expects it to be open. This is typically caused by a stuck/shorted switch, a short-to-ground in the wiring harness, or excessive mechanical wear/misadjusted linkage.

• 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
• 5400 Series
• 5600 Series
• 5700 S Series
• 5700 SL Series
• 6400 Series
• 6600 Series
• 6700 S Series
• 7600 Series
• 7700 S Series

1. 1

   Inspect the park brake switch electrical connector for water ingress, corrosion, or damaged pins.

2. 2

   Disconnect the switch and check the wiring harness leading back to the HITCH module for a short to ground. If the code changes to an 'Open Circuit' code when unplugged, the wiring is likely intact, pointing to the switch itself.

3. 3

   Use a multimeter to test the switch for continuity. Manually actuate the switch plunger/lever. If the switch fails to break continuity (remains closed) when actuated, it has failed internally.

4. 4

   Inspect the physical park brake linkage and the brake discs/pads. If components are severely worn, the linkage may over-travel, failing to release the switch. Ensure the switch bracket is not bent.

1. 1

   Secure the Machine

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

2. 2

   Locate the Switch

   Depending on the specific cab and transmission layout, locate the park brake switch (often mounted near the base of the handbrake lever assembly or along the ParkLock linkage on the transmission housing).

3. 3

   Disconnect

   Unplug the electrical connector from the switch.

4. 4

   Remove

   Loosen the retaining nuts or mounting bracket holding the switch in place and unthread/remove the faulty switch.

5. 5

   Install

   Thread the new switch into the bracket.

6. 6

   Adjust

   Carefully adjust the depth of the switch using the locking nuts so that the brake linkage properly depresses and releases the switch plunger without crushing it.

7. 7

   Reconnect & Clear

   Plug the electrical connector back in. Turn on the ignition, clear the stored 13.00.49 fault code via the dash or diagnostic tool, and cycle the park brake several times to verify the code does not return.