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ABS issue

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Old Feb 15, 2010 | 03:42 PM
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Default ABS issue
I have a 98 audi a4 1.8t quattro. When i step on the brake pedal when im coming to a stop it starts pulsating back like the abs is activated but when im in no chance of sliding at all on bone dry roads. and im not braking very hard at all. does anyone have any ideas where to start?

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Old Feb 16, 2010 | 02:55 AM
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You are having a wheel sensor issue, a common problem dating back to the earliest days of ABS. Which corner did you work on just before the problem started?
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Old Feb 16, 2010 | 04:19 AM
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Originally Posted by 4Driver4
You are having a wheel sensor issue, a common problem dating back to the earliest days of ABS. Which corner did you work on just before the problem started?
none i bought the car with this problem. do all four wheels have a speed sensor on them?
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Old Feb 16, 2010 | 05:05 AM
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Yes. Use VAG-COM to check the speeds registering at each sensor. It should be easy to tell where the problem is.
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Old Feb 16, 2010 | 07:12 AM
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Originally Posted by 4Driver4
Yes. Use VAG-COM to check the speeds registering at each sensor. It should be easy to tell where the problem is.
My vagcom couldn't pickup which wheel speed sensor it was when I had this problem because the ABS wasn't throwing a code. I had to go around to each wheel, remove the wheel, and check on which sensor wasn't seated properly. It ended up being my front right sensor, it was simply pushed out about 1.5 mm. I pushed it in and presto, no more issues.
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Old Feb 16, 2010 | 07:18 AM
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You need to look further than a simple code. Dirty or unseated sensors do not throw codes. You can use the measuring blocks to view the readings all sensors simultaneously in graphical format. It's very easy to spot the lazy one.
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Old Feb 16, 2010 | 07:31 AM
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Very good, I did not know that. Which blocks do you measure?
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Old Feb 16, 2010 | 07:53 AM
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I don't recall offhand. I generally just start at 1 and work my way up. There are not many choices, so you'll find it quickly. There is also a button for graphical representation. It's pretty cool.
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Old Feb 16, 2010 | 08:15 AM
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I dont have vag com but i could try to pull all the sensors and clean them and check them for continuity. does anyone have a picture of their exact location and what they look like so im not hunting them down in my tiny garage. thanks again guys for the help
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Old Feb 16, 2010 | 09:06 AM
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It is pretty easy to identify, I don't have a picture though.

The are behind your rotors and you'll what they are because a wire will be running from the top of the wheel well down the shock and to the sensor. Here is what a new one looks like:
To look at different ABS sensors click here
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