Antilock Brakes / Traction Control Systems: Service and Repair

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.

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

NOTE:
^ This procedure only needs to be performed if the 4-wheel anti-lock brake (4WABS) hydraulic control unit (HCU) has been replaced.
^ One conventional pressure bleed cycle consists of advancing the brake pedal to its extended position, opening the rear disc brake caliper bleeder screw, allowing fluid to be released into the waste container, closing the rear disc brake caliper bleeder screw, and releasing the brake pedal to its full upright position.
^ When any part of the hydraulic system has been disconnected for repair or replacement, air may get into the system and cause spongy brake pedal action. This requires the bleeding of the hydraulic system after it has been properly connected. The hydraulic system can be bled manually or with pressure bleeding equipment Brake Bleeder.
^ Add recommended brake fluid as necessary throughout the procedure.

Placing Wrench On Front Disc Brake Bleeder Screw:

1. Connect a clear waste line to the RH rear disc brake caliper bleeder screw and place the other end in a container partially filled with recommended brake fluid.
2. With the RH rear disc brake caliper bleeder screw open, cycle the brake pedal until no more air is seen in the waste line.

Tightening Rear Bleed Screw:

3. Close the RH rear disc brake caliper bleeder screw and disconnect the waste line.
4. Repeat steps 1, 2, and 3 for the LH rear disc brake caliper bleeder screw, the RH front disc brake caliper bleeder screw, and the LH front disc brake caliper bleeder screws.

NOTE: Performing the NGS program routine drives entrapped air from the otherwise inaccessible lower section of the 4WABS valve into the upper sections (accessible by bleeding the brakes). Subsequent bleeding removes the air from the system.

Connecting Cable Adapter Into Vehicle Data Link Connector:

5. Connect the (A) NGS DCL cable adapter into the (B) vehicle data link connector (DLC). Follow NGS procedure as per manufacturer's specifications to puree air from the HCU.
6. Repeat the conventional bleed procedure as outlined in steps 1 through 4.
7. If the brake pedal feels spongy, repeat the NGS service bleed procedure.