B4000 4WD V6-4.0L OHV (1995)
Brake Bleeding: Service and Repair
AIR BLEEDING (VEHICLE EQUIPPED WITH 4W-ABS)
Note:
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The 4W-ABS system must be bled in two steps.
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The brake master cylinder and Hydraulic Control Unit must be bled using SSTs. If this procedure is not followed, air will be trapped in the
HCU which eventually leads to a spongy brake pedal.
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To bleed the brake master cylinder and HCU, disconnect the 40-pin plug from the Electronic Control Unit and install the SSTs to the wire
harness 40-pin plug.
1. Disconnect the (40-pin plug) from Electronic Control Unit (ECU).
2. Connect the SST (49 UNO1 063) to the 40-pin plug on the vehicle harness.
3. Connect the previously released SST (49 UNO1 063) to the 55-pin plug on the Adapter.
4. Slide the SST switch to the BLEED position.
5. Turn the vehicle ignition switch to the ON position The OFF indicator light should be illuminated.
6. Press the MOTOR Start button. The ON indicator light should be illuminated.
7. Run the pump motor for 20 seconds. Then push and hold the VALVE button for 20 seconds. This bleeds any trapped air from the master cylinder
and HCU. Release the VALVE button.
Note:
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The pump motor will continue to run for 20 seconds after the VALVE button is released.
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The OFF indicator lamp will be illuminated when the operation is complete.
8. Turn the vehicle ignition switch OFF. Disconnect the SST and reconnect the vehicle harness to the ECU.
9. Attach a vinyl hose to the right rear bleeder plug.
Note:
-Press the ABORT button to turn the pump motor OFF during the bleed function.