Lumina V6-191 3.1L VIN T MFI (1993)
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Fluid reservoir cover.
Hydraulic Modulator/Master Cylinder Assembly
1. Prime hydraulic modulator/master cylinder assembly.
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Attach bleeder hose to rearward bleeder valve and submerge opposite hose end in clean container partially filled with brake fluid. Slowly open
rearward bleeder valve 1/2 to 3/4 turns. Depress brake pedal and hold until fluid begins to flow. Close valve and release brake pedal. Repeat
Step 1 until no air bubbles are present. Repeat procedure for forward bleeder valve until fluids begins to flow.
Important
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Once fluid is seen to flow from both modulator bleeder valves, the hydraulic modulator master cylinder assembly is sufficiently full of fluid.
However, it may not be completely purged of air. At this point move to the wheel brakes and bleed them. This ensures that the lowest points in
the system are completely free of air and then the hydraulic modulator/master cylinder assembly can be purged of any remaining air.
Remove or Disconnect
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Fluid reservoir cover.
Inspect
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Fluid level in reservoir and fill to the correct level if necessary.
Install or Connect
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Fluid reservoir cover.
2. Raise vehicle and suitably support.
Important
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Bleed sequence:
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Right rear.
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Left rear.
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Right front.
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Left front.
3. Bleed wheel brakes in sequence shown above.
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Attach bleeder hose to bleeder valve and submerge opposite hose in clean container partially filled with brake fluid.
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Open bleeder valve.
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Slowly depress brake pedal.
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Close valve and slowly release brake pedal.
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Wait 5 seconds.
4. Repeat Step 3, including the five seconds wait until brake pedal feels firm at half travel and no air bubbles are observed in the bleeder hose.
5. Repeat Steps 3 and 4 on left rear wheel brake.
6. Repeat Steps 3 and 4 on front wheel brakes.
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To assist in freeing entrapped air, tap lightly on caliper casting with a rubber mallet.
7. Lower vehicle.
Remove or Disconnect
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Fluid reservoir cover.
Inspect
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Fluid level in reservoir and fill to the correct level if necessary.
Install or Connect
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Fluid reservoir cover.
8. Bleed the ABS hydraulic modulator/master cylinder assembly.
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Attach bleeder hose to rearward bleeder valve and submerge opposite end in clean container partially filled with brake fluid.
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Depress brake pedal with moderate force.
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Slowly open rearward bleeder valve 1/2 to 3/4 turns and allow fluid to flow.
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Close valve and release brake pedal.
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Wait five seconds.
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Repeat above steps, including the five second wait, until all the air is purged from the system.
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Repeat procedure for forward bleeder valve until all air is purged from the system.
