Question about Audi S4

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Audi s4 b5 ,brake pedal kicking back as car slows to a hault .all abs wheel sensors working

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I have got the same problem. Someone told me that an ABS sensor could make contact.
dantuan, do you remember how much you spent on the rear axle repair ?
If anyone knows the price of such a repair, I would be glad to hear it.

Many thanks !

Posted on Jan 14, 2010



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I had a similar problem on my 2002 S4 (B5) Avant. My car ended up needing a new rear axle - there was an issue with the axle, where the wheel speed sensor made contact. With a new rear axle the car was back to normal. I would have never guessed an axle would have caused this problem, but it was the case for my S4. Note: If you need to replace a rear axle, be prepared to spend 3x the price of a frt axle + they're not easy to find. If budget is an issue, you may want to try to find a used one.

My indy shop was able to troubleshoot this in less than 1 hour. In my opinion, Audi should be able to do the same.

Good luck.

Posted on Nov 15, 2008


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Hi Tino75,
I suggest that your vehicle needs to be taken for an electronic scan....Your problem may be to do with the ABS pump or a loose wheel bearing...please let us have more imfo

Posted on Aug 10, 2008

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What's wrong with my ABS?

Random would be a broken wire. Read the codes to see which side. GM put hard plastic coverings over the wheel sensor wires. Follow it back, while bending and see where it is broken. Most likely the wire is broke there also. It could be several places in the harness.

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Hello I have a 2003 gmc envoy 4wd had to replace front hub assemblies, brake rotors and brake pads. after the job was complete took it for a test drive and every thing worked fine. my wife drove it back...

sounds like the ABS kicked in while your wife was coming to a stop. This would be known as overactive ABS. It usually occurs under 5 mph while braking. It is usually caused by a speed sensor signal dropping out at slow speeds which makes the ABS module think that the wheel has locked up. It will then engage the ABS to unlock the wheel even though the wheel is turning. The brake pedal will fade and the grind of the ABS motor will be heard.

If this was an isolated incident it will be difficult to determine the source of the problem. It it becomes more frequent and predictable it will become a lot easier to figure out. Most of the time a scan tool capable of reading ABS data will be used. The vehicle will be driven while monitoring ABS wheel speed data. When the problem occurs the wheel speed on one of the wheels will drop out and then that wheel/bearing/sensor can be inspected.

Did you torque the axle nuts after installing the new hub and bearings to the proper spec?

Have you checked to see if the new bearings are still tight? with the wheel off the ground grab it at the 12 and 6 o'clock position. if there is any play than that could cause the problem.

let me know what you find or if you have any more questions.

I’m happy to assist further over the phone at

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Brake pedal a.b.s pulsation at slow speeds on dry road.It wont do it all the time. It is on a 2000 chevy silverado 1500 4x4. I can hear the abs kick in when this happens.

You may see the abs light come on in your dash. I would plug a OBD II reader in and retrieve the codes.
I would say you either have a sensor that has gone bad or possibly a wire is shorting.
You can see the wheel sensor if you turn your wheels, and look down by the wheel hub bearing.
You can here the abs go whrrrrrrrr, when you step on the brake, and your braking flucuating.
Please let me know what you find.

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Sounds like the ABS is activating. Have the OBD scanned for codes. May be a bad wheel sensor.

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As I slow to a stop the ABS kicks on in my 2000 Audi s4

sounds like you got either a misreading(bad wheel speed sensor/abs sensor)
or a dirty sensor
or a broken reluctor ring on the axle
prematurely setting the abs to come on for no reason when your almost at a stop,,,,
i would take it to the shop,but its gonna be one of them things

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ABS Kicks in Prior to stopping...always

abs module may be bad especially if no abs light is on

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1996 Explorer is similar

It may be a calibration issue. The sensor doesn't know what is considered slow or stop., Yes,your right, a computer thing.

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I have a 1993 Lincoln Town Car and when I push the brake pedal it kicks back sometimes but not always? Can you give me a clue what is happening?

Sounds like false activation of ABS. Usually this is caused by to much variance in the wheel speed sensors side to side. See the wheel speed sensors on this vehicle generate an AC Mhz signal that is sent to the ABS module if it see's a 100 Mhz difference from side to side it interrupts this as a possible ABS event and will activate the ABS.
The ABS system turns off around 20 mph because you do not need ABS at slow speeds if you have this condition of speed variation and a signal to turn itself off at the same time it gets confused and you have a pedal kick back.
Inspect the sensors and the sensor rings at each wheel.Make sure you don't see any cracks in the sensor ring(will have teeth on the ring that passes the end of the sensor,this is how it generates the signal). Check the gap between the sensor and the rings on this model it is 0.040. If you don't see anything obvious the only other option is to measure the freqency of the sensors while the wheels are spinning at the same speed and compare them side to side.

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