Bleed Brake System

CAUTION:

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Escaping fluid under pressure can penetrate the skin causing serious injury. Avoid the hazard by relieving pressure before disconnecting hydraulic or other lines. Tighten all connections before applying pressure. Search for leaks with a piece of cardboard. Protect hands and body from high-pressure fluids.

If an accident occurs, see a doctor immediately. Any fluid injected into the skin must be surgically removed within a few hours or gangrene may result. Doctors unfamiliar with this type of injury should reference a knowledgeable medical source. Such information is available from Deere & Company Medical Department in Moline, Illinois, U.S.A.

NOTE: Two service technicians are needed to bleed the brake system: one to operate the brake pedals and the other to open and close bleed screws.


Bleed Trailer Brake System

IMPORTANT: Trailer brake system bleeding needs to be done whenever trailer brake valve is installed on tractor or whenever the oil lines are repaired or reinstalled or transmission/hydraulic oil is filled up in the transmission reservoir.

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A - Bleed Screw

REASON:

For the proper functioning of trailer brake system and to remove air bubbles from the trailer brake system.

CONNECTIONS:

Connect a clear plastic tube to the trailer brake valve bleed screw (A). Put the other end of tube into a suitable container.

PROCEDURE:

  1. Open rubber cap from the bleed screw and connect a plastic pipe to bleed screw.

  2. Start the engine and run at slow idle to keep brake valve reservoir full of oil.

  3. Pump brake pedal to obtain highest pedal position and hold. Loosen bleed screw 3/4 turn and slowly push brake pedal. Before brake pedal completes full pedal travel, tighten bleed screw.

  4. Let pedal return slowly to the top of its stroke. Continue this operation until the flow of oil in plastic tube is free of air bubbles.

  5. When flow of oil is free of air bubbles hold down the pedal and tighten bleed screw as per the specification.

    ItemMeasurementSpecification
    Bleed Screw MountingTorque7 N·m (5 lb-ft)

    NOTE: Always ensure to perform brake bleeding after installation of trailer brake valve.


Bleed Tractor Brake System

  1. Start engine and check for leaks.

  2. Check for proper transmission/hydraulic oil level. Add as needed.

    NOTE:

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    A - Bleed Port

    Anytime the brake system has been opened for service (lines disconnected, etc.), it is necessary to bleed air from the brake system.


  3. Connect a clear plastic tube on left brake bleed Port (A). Drain into container.

  4. Start engine and run at slow idle to keep brake valve reservoir full of oil.

  5. Pump brake pedal to obtain highest pedal position and hold. Loosen bleed screw 3/4 turn and slowly push brake pedal. Before brake pedal completes full pedal travel, tighten bleed screw.

  6. Let pedal return slowly to top of stroke. Continue this operation until flow of oil in plastic tube is free of air bubbles.

  7. When flow is of oil is free of air bubbles, hold pedal down and tighten bleed screw.

  8. Remove plastic tube.

  9. Repeat bleed procedure for other brake.

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