WARNING: If any components above the Hydraulic Control Unit (HCU), including the HCU itself, are being replaced, the brake system must be bled using the diagnostic system specified by Land Rover. This will ensure that all air is bled from the new component(s).
NOTE: The procedure described below is intended for bleeding the brake system when replacing components located after the HCU. If the operations performed affect only one of the brake system circuits - primary or secondary - only that circuit is bled. Partial bleeding of the brake system is permitted only in the event of minimal loss of brake fluid when disconnecting a brake pipe or hose.
1. Raise and support the vehicle. Make sure the brake fluid lines are secure and there are no signs of a brake fluid leak. If there are signs of a brake fluid leak, locate and repair the leak before attempting to bleed the brake system. Refer to Procedure: Brake System (206-00 Brake System - General Information, Diagnosis and Testing). Press and release the brake pedal until the brake booster disengages.
WARNING: Never work on a vehicle supported solely by a jack. Always support the vehicle securely.
2. Remove the cap from the brake fluid reservoir. Add brake fluid to the reservoir to the maximum mark. Attach a tube to the brake caliper bleed screw and immerse the end of the bleed tube in a suitable container containing a small amount of the specified brake fluid.
WARNING: Do not allow dirt or foreign fluids to enter the reservoir. Use only fresh brake fluid that meets the specification from a sealed container. Do not mix different grades of brake fluid because of possible incompatibility.
CAUTION: Brake fluid may damage paintwork if it comes into contact with it. If brake fluid is spilled, remove it immediately and rinse the area with water.
3. Starting with the brake caliper farthest from the master cylinder, loosen the bleed screw about a half to three-quarters of a turn.
4. With assistance, gently and firmly depress the brake pedal until it stops and allow it to return to its original position. Repeat this procedure until clean, air-free fluid begins to flow into the air bleeder container. When clean, bubble-free brake fluid begins to flow into the container, depress the pedal and do not release it.
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CAUTION: The brake fluid reservoir must remain filled with new, clean brake fluid throughout the bleeding procedure.
5. With the brake pedal fully depressed, tighten the bleed screw. Tightening torque: 10 Nm
CAUTION: After bleeding the air, be sure to put the cap back on the bleed screw. This will protect the bleed screw from corrosion.
6. Add brake fluid to the reservoir up to the maximum mark.
7. Repeat the above procedure to bleed each brake caliper. Add brake fluid to the reservoir to the maximum mark. Check the operation of the brake system and make sure there are no leaks. Replace the brake fluid reservoir cap. Install the reservoir access panel.
WARNING: Failure to bleed the brake system in the correct sequence can seriously affect braking performance.
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