The pressure bleeding equipment must be of the diaphragm type. It must have a rubber diaphragm between the air supply and the brake fluid to prevent air, moisture and other contaminants from entering the hydraulic system.
- Clean the master cylinder fluid reservoir cover and surrounding area, then remove the cover.
- Add fluid, if necessary to obtain a proper fluid level.
- Connect bleeder adapter J 35589, or equivalent, to the brake fluid reservoir, then connect the bleeder adapter to the pressure bleeding equipment.
- Adjust the pressure bleed equipment to 5-10 psi (35-70 kPa) and wait about 30 seconds to be sure there is no leakage.
Adjust the pressure bleed equipment to 30-35 psi (205-240 kPa).
WARNINGUse a shop rag to catch the escaping brake fluid. Be careful not to let any fluid run down the motor pack base or into the electrical connector.
With the pressure bleeding equipment connected and pressurized, proceed as follows:
- Attach a clear plastic bleeder hose to the rearward bleeder valve on the hydraulic modulator.
- Slowly open the bleeder valve and allow fluid to flow until no air is seen in the fluid.
- Close the valve when fluid flows out without any air bubbles.
- Repeat Steps 6b and 6c until no air bubbles are present.
- Relocate the bleeder hose on the forward hydraulic modulator bleed valve and repeat Steps 6a through 6d.
- Tighten the bleeder valve to 80 inch lbs. (9 Nm).
Proceed to bleed the hydraulic modulator brake pipe connections as follows with the pressure bleeding equipment connected and pressurized:
- Slowly open the forward brake pipe tube nut on the hydraulic modulator and check for air in the escaping fluid.
- When the air flow ceases, immediately tighten the tube nut. Tighten the tube nut to 18 ft. lbs. (24 Nm).
- Repeat Steps 8a and 8b for the remaining three brake pipe connections moving from the front to the rear.
- Raise and safely support the vehicle.
Proceed, as outlined in the following steps, to bleed the wheel brakes in the following sequence: right rear, left rear, right front, then left front.
- Attach a clear plastic bleeder hose to the bleeder valve at the wheel, then submerge the opposite hose end in a clean container partially filled with clean brake fluid.
- Slowly open the bleeder valve and allow the fluid to flow.
- Close the valve when fluid begins to flow without any air bubbles. Tap lightly on the caliper or backing plate to dislodge any trapped air bubbles.
- Repeat Step 11 on the other brakes using the earlier sequence.
- Remove the pressure bleeding equipment, including bleeder adapter J 35589, or equivalent.
- Carefully lower the vehicle, then check the brake fluid and add if necessary. Secure the reservoir cap onto the reservoir.
- With the ignition switch turned to the RUN position, apply the brake pedal with moderate force and hold it. Note the pedal travel and feel. If the pedal feels firm and constant and the pedal travel is not excessive, start the engine. With the engine running, recheck the pedal travel. If it's still firm and constant and pedal travel is not excessive, go to Step 17.
If the pedal feels soft or has excessive travel either initially or after the engine is started, the following procedure may be used:
- With the Tech 1® or equivalent scan tool, RELEASE then APPLY each motor 2-3 times and cycle each solenoid 5-10 times. When finished, be sure to APPLY the front and rear motors to ensure the pistons are in the upmost position. DO NOT DRIVE THE VEHICLE.
- If a Tech 1® or equivalent scan tool is not available, remove your foot from the brake pedal, start the engine and allow it run for at least 10 seconds to initialize the ABS. DO NOT DRIVE THE VEHICLE. After 10 seconds, turn the ignition switch to the OFF position. The initialization procedure most be repeated 5 times to ensure any trapped air has been dislodged.
- Repeat the bleeding procedure, starting with Step 1.
- Road test the vehicle, and make sure the brakes are operating properly.