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ABS pulsing ... not module?

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Old 05-24-2006, 11:11 AM
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DxC
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Default ABS pulsing ... not module?

Hey guys, my car used to engage ABS when slowing down. Then my ABS and brake lights lit up. I figured it was the module, so I sent it in for a rebuild. I got it back and I am still having the pulsing issue. What else to check?

I remember a post by SupraS4, but the problem sounds different.

https://forums.audiworld.com/s4/msgs/2368774.phtml

any ideas? thanks.
Old 05-24-2006, 11:18 AM
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Default Re: ABS pulsing ... not module?

Maybe I'm way out of line here, but isn't ABS supposed to pulse when it's working. Isn't that the point of ABS? I just got my module back and installed and the braking feels much more solid (without ABS it felt like the pedal would go to the floor).
Old 05-24-2006, 11:20 AM
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Default That's assuming you actually trigger the ABS system for a reason.

A slow stop isn't an ABS situation.

I'm not sure what he means when he says "pulsing" though. If it's a groaning sound coming from the engine bay and a vibration in the pedal, it's the ABS pump cycling.
Old 05-24-2006, 11:26 AM
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Default Re: That's assuming you actually trigger the ABS system for a reason.

Agreed.
Old 05-24-2006, 11:53 AM
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May be a speed sensor on one of the wheels
Old 05-24-2006, 12:22 PM
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Rpulsing = brake pedal pulsing as if abs is working hard
Old 05-24-2006, 12:23 PM
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ohh yeaa. ill look into that
Old 05-24-2006, 12:54 PM
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I would check the speed sensors as PaJohn said. Use Vag-Com, log, and post em up.
Old 05-24-2006, 02:49 PM
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I think what you're describing is the ABS pump cycling.
Old 05-24-2006, 02:50 PM
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Default You mentioned this to me...how is this done? I've logged blocks for the engine for FATS runs...

but that's all...


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