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Old 04-18-2004, 02:12 PM
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bleeding an ABs module

Hey guys,

Does any one now how to bleed the ABS module on a 94 Chevy Pickup. I changed the front pads and rear shoes but when I was bleeding the brakes my wife stepped off the pedal before I was ready. The calipers have no air in them because I bled them about 6 more times but the pedal is still soft. I was told that the ABS module needs to be bled to rectify this. I'm not real familar with ABS as this is my first ride that has it. Any help would be great. Thanks.

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Old 04-18-2004, 06:28 PM
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Question

If you got solid fluid out of both calipers, the system should have no air. Are the rear shoes adjusted properly? Have you driven the truck and has the ABS light come on?

Some systems are crossed, i.e.the front and/or rear master cylinder reservoir will control one front caliper and the oppsite rear wheel cylinder. You need to trace the lines from the proportioning valve to see if it is a split system. It requires a different bleeding procedure.

If the pump itself has to be bled, it is done by activation with a scan tool.
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Old 04-18-2004, 09:04 PM
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I'll look at the lines to see what I have. What is the correct procedure for bleeding them. Do I have to do it in a certain order ie front left then right rear? thanks for the help
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Old 04-19-2004, 06:34 AM
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Cool

Sorry About That....They are putting us to bed earlier here at the home with the time change...

Yes...On a diagonal system, the left front is on the same circuit as the right rear. This allows balanced braking in case of a component failure whereas the old system had only front or back brakes in case of failure.

If it is diagonal, you start with the bleeder valve furthest from the master cylinder and then do the front bleeder opposite it. You then do the other rear and then the front directly opposite that one.

Hope that this is understandable.
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Old 04-19-2004, 02:24 PM
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Thanks a lot. I'll give this a go and see what happens.
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