Component Bleeding

Component Bleeding

Material:

Material

Master Cylinder Priming In Vehicle or Bench

WARNING: Use of any brake fluid other than approved DOT 3 will cause permanent damage to brake components and will render the brakes inoperative. Failure to follow this instruction may result in personal injury.

WARNING: Brake fluid contains polyglycol ethers and polyglycols. Avoid contact with eyes. Wash hands thoroughly after handling. If brake fluid contacts eyes, flush eyes with running water for 15 minutes. Get medical attention if irritation persists. If taken internally, drink water and induce vomiting. Get medical attention immediately. Failure to follow this instruction may result in personal injury.

CAUTION: Brake fluid is harmful to painted or plastic surfaces. If brake fluid is spilled onto a painted or plastic surface, immediately wash it with water.

CAUTION: Do not allow the brake master cylinder reservoir to run dry during the bleeding operation. Keep the brake master cylinder reservoir filled with the specified brake fluid. Never reuse the brake fluid that has been drained from the hydraulic system.

NOTE: When any part of the hydraulic system has been disconnected for repair or installation, air can get into the system and cause spongy brake pedal action. This requires bleeding of the hydraulic system after it has been correctly connected. The hydraulic system can be bled manually or with pressure bleeding equipment.

NOTE: When the brake master cylinder has been installed new or the system has been emptied or partially emptied, it must be primed to prevent air from entering the system.





1. For in vehicle priming, disconnect the brake lines from the brake master cylinder.





2. For bench priming, mount the brake master cylinder in a vise.





3. Install short brake tubes with the ends bent into the brake master cylinder reservoir.
^ Fill the brake master cylinder reservoir with DOT 3 brake fluid.





4. If equipped with speed control, for a new brake master cylinder, remove the speed control deactivator switch.





5. Fill the speed control deactivator switch with the DOT 3 brake fluid.





6. Install the speed control deactivator switch.
7. Slowly press the primary piston or, for in-vehicle priming, have an assistant slowly pump the brake pedal until clear brake fluid flows from both brake tubes with no air bubbles.
8. If necessary, install the brake master cylinder into the vehicle.





9. Remove the short brake tubes and install the master cylinder outlet tubes.





10. Loosen a brake inlet tube at the 4WABS Hydraulic Control Unit (HCU).

11. NOTE: Refill the brake master cylinder reservoir as necessary.

Have an assistant apply and hold the brake pedal.





12. Tighten the inlet tube fitting at the HCU.
13. Repeat the above three steps until no air bubbles are seen in the expelled brake fluid.





14. Repeat the above four steps for the remaining 4WABS hydraulic control unit inlet tube.





15. Connect one end of a flexible tube to the master cylinder bleeder screw. Submerge the other end in a container partially filled with the specified brake fluid.
16. Have an assistant pump and then hold firm pressure on the brake pedal.

17. NOTE: Refill the brake master cylinder reservoir as necessary.

Loosen the master cylinder bleeder screw until brake fluid flows out of the drain tube.





18. Tighten the master cylinder bleeder screw.
19. Repeat the above three steps until there are no air bubbles in the expelled brake fluid.
20. Bleed the brake system.

Four Wheel AntiLock Brake System (4WABS) Hydraulic Control Unit (HCU)

NOTE: This procedure only needs to be carry out if the 4-wheel antilock brake (4WABS) hydraulic control unit (HCU) has been installed new.





1. Clean all dirt from and remove the brake master cylinder filler cap, and fill the brake master cylinder reservoir with the specified brake fluid.





2. Connect a clear drain tube to the RH rear bleeder screw and the other end in a container partially filled with recommended brake fluid.
3. Have an assistant pump the brake pedal and then hold firm pressure on the brake pedal.
4. Loosen the RH rear bleeder screw until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the bleeder screw.
^ Repeat until clear, bubble free fluid comes out.
^ Refill the brake master cylinder reservoir as necessary.





5. Tighten the bleeder screw.
6. Repeat Steps 36 for the LH rear bleeder screw, the RH front bleeder screw and the LH front bleeder screw, in that order.

Caliper






1. NOTE: It is not necessary to do a complete brake system bleed if only the disc brake caliper was disconnected.

Place a box end wrench on the disc brake caliper bleeder screw. Attach a rubber drain tube to the disc brake caliper bleeder screw, and submerge the free end of the tube in a container partially filled with clean brake fluid.
2. Have an assistant pump the brake pedal and then hold firm pressure on the brake pedal.
3. Loosen the disc brake caliper bleeder screw until a stream of brake fluid comes out. While the assistant maintains pressure on the brake pedal, tighten the disc brake caliper bleeder screw.
^ Repeat until clear, bubble-free fluid comes out.
^ Refill the brake master cylinder reservoir as necessary.





4. Tighten the disc brake caliper bleeder screw.