Massey Ferguson 14.00.0B – TRANS1: High Pressure Brake System Pressure Not Dropping DYNA 6 (TRANS1)

The system detects that the hydraulic pressure in the high-pressure brake circuit (typically the handbrake or trailer brake system) is failing to drop after the brake release command is given. This indicates that either residual hydraulic pressure is trapped in the line (due to a stuck valve or blockage) or the brake pressure sensor is malfunctioning and falsely reporting high pressure to the controller.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 5611
• 5612
• 5613
• 5709
• 5710
• 5711
• 5712
• 5713
• 6614
• 6615
• 6616
• 6712 S
• 6713 S
• 6714 S
• 6715 S
• 6716 S
• 6718 S
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 8660
• 8670
• 8680
• 8690
• 8727
• 8730
• 8732
• 8735
• 8737

1. 1

   Verify active codes by accessing the diagnostic menu to confirm 14.00.0B is currently active. Clear the code to see if it immediately returns upon cycling the handbrake/brakes.

2. 2

   Monitor sensor data using a diagnostic service tool to check the live voltage/pressure reading from the Handbrake/Trailer Brake Pressure Sensor. If it reads high pressure while the tractor is off or the brake is mechanically released, the sensor is likely biased or shorted.

3. 3

   Inspect the wiring harness leading to the brake pressure sensor for chafing, open circuits, or a short to voltage (which would cause a false high reading).

4. 4

   If the sensor is reading accurately, physically inspect the high-pressure brake valve block. Check for a sticking solenoid or spool valve preventing hydraulic fluid from returning to the sump.

1. 1

   Relieve System Pressure

   Ensure the tractor is parked on a level surface, the engine is off, and all hydraulic pressure is safely relieved before opening the brake circuit.

2. 2

   Inspect/Replace the Sensor

   Locate the Handbrake/Trailer Brake Pressure Sensor on the brake valve block. Disconnect the electrical connector. If the diagnostic checks pointed to a faulty sensor, unthread the old sensor and install the replacement.

3. 3

   Clean/Replace the Valve (if applicable)

   If the sensor was proven good but pressure is genuinely not dropping, remove the brake release solenoid/valve. Inspect for debris, damaged O-rings, or a scored spool. Clean the valve body or replace the solenoid assembly as necessary.

4. 4

   Bleed the System

   If hydraulic lines were opened, bleed the brake system according to the OEM service manual to remove any trapped air.

5. 5

   Clear Codes and Test

   Reconnect all harnesses. Turn the key on, clear the 14.00.0B fault code via the diagnostic menu, and operate the tractor. Engage and disengage the park brake/brakes to ensure the pressure drops normally and the code does not return.