ABS cutting in at low speed

Post by **SimonS4MTM** » Mon Nov 27, 2006 10:06 am

Hi all

Some help please!

I can feel my abs cutting in at speeds below 30mph. Not all the time and very slightly.

Obviously this is an abs sensor or sensor ring problem, either dirt or corrosion.

The question is, how do I find out whcih corner of the car is causing the problem, without taking all four corners appart?

Cheers

Post by **SimonS4MTM** » Mon Nov 27, 2006 3:57 pm

20 views and no responce!

Anyone got any ideas?

Post by **Dr-Al** » Mon Nov 27, 2006 4:01 pm

No ideas, but the same problem. I'm looking for answers too.

Already changed 1 ABS ring and I now have the problem on another wheel!

Post by **oliew** » Mon Nov 27, 2006 4:10 pm

vag com mate should give you an intermittent fault?
will tell you which wheel sensor it is.

Post by **SimonS4MTM** » Mon Nov 27, 2006 4:11 pm

No faults shown on vagcom. If it is dirt on the sensor ring then no fault will be detected.

Post by **Alps** » Mon Nov 27, 2006 4:18 pm

If you're popping over to Woody's on the 9th we can all take off a wheel each and check which sensor it is? Won't be as knackering that way.

Post by **SimonS4MTM** » Mon Nov 27, 2006 4:23 pm

Great idea, all depends on the wifes plans though unfortunately.

Post by **Nige_RS4** » Mon Nov 27, 2006 4:38 pm

The question is, how do I find out whcih corner of the car is causing the problem, without taking all four corners appart?

SnapOn do an ABS tool that monitors signals from individual ABS sensors - my local garage has got one and they have picked up 3 damaged sensor rings in a couple of months. One guy with an S4 was planning on upgrading his rear brakes as he thought they were overheating (it was the ABS over-working them!!)

HTH

Post by **SimonS4MTM** » Mon Nov 27, 2006 4:53 pm

hmmm, thanks Nige.

I wonder if you can monitor wheel speeds in vag-com? Anyone know?

Post by **Dr-Al** » Mon Nov 27, 2006 5:02 pm

SimonS4MTM wrote:hmmm, thanks Nige.

I wonder if you can monitor wheel speeds in vag-com? Anyone know?

You can, but the ABS module breaks the connection to VAG-COM as soon as it cuts in with the pulsing. This makes it pretty useless at diagnosing a faulty ring.

That said, I only have the freeware lead, so the full lead may work better.

Post by **SimonS4MTM** » Mon Nov 27, 2006 5:04 pm

DrAl

What address do you look at?

Post by **david7m** » Mon Nov 27, 2006 5:21 pm

Is it not as simple as removing a wheel and the sensor to be cleaned is straight infront of you? ie nothing else needs to be removed?

Dave

Post by **SimonS4MTM** » Mon Nov 27, 2006 5:26 pm

You need to remove the upright assembly. The abs ring is on the end of the cv joint.

Not a particularly quick job!

Post by **david7m** » Mon Nov 27, 2006 5:31 pm

I see

Dave

Post by **SimonS4MTM** » Mon Nov 27, 2006 5:35 pm

Yes, pain in the

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ABS cutting in at low speed

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