ABS Problems at Low Speed

[pab]

Originally Posted by klarzy

Wheel bearing in garage £100 - £150+
DIY £30-£40 for a good bearing but 3 hours and a 10 tonne press are usually a must, you will also usually destroy the abs sensor getting it out if corroded in place so count another £12 for a cheapy to £60+ for a good one. You should get a new hub nut with the bearing kit.

Best in the garage for most...

ten ton press, watch Andy Willi get them out, and in.

[klarzy]

Originally Posted by vindaloo

Unfortunately didn't have my T4 when this happened and it was the fourth wheel checked, but I won't get the problem in the future as I'm now tooled up

If you know the ABS sensor output type you could unplug each wheel, attach to a meter / appropriate supply and spin the wheel??

Obviously much easier if you have an old female ABS socket to hook up to...

I am not sure of the output type, just tried a spare I have on resistance, capacitance, mV-mA but I am sure one of the guru's can draw up the appropriate test rig for a home test kit?

[klarzy]

Originally Posted by pab

ten ton press, watch Andy Willi get them out, and in.

My drivers side was solid, used the press at my local friendly MOT centre and it went with a right bang...

[Dragrad]

Thread moved to appropriate forum. Re-direct left in old.

[Jakg]

I should add, no ABS light and no fault codes on my Scangauge.

[klarzy]

Originally Posted by Jakg

I should add, no ABS light and no fault codes on my Scangauge.

if the sensor or reluctor are breaking down you will not have a fault as the system will just assume you are skidding and the ABS is reacting properly.
As I said try a couple of cheap sensors first you can get 2 delivered for 20 quid, if it solves it straight off then great, if not then look at the bearings.
Do any of the wheels sound odd if you jack the car up and turn them by hand?

[vindaloo]

Originally Posted by Jakg

I should add, no ABS light and no fault codes on my Scangauge.

If it's the bearing/ ring that has given up the ABS light will not necessary be illuminated. I had the same symptoms and no ABS light

[Jakg]

Originally Posted by klarzy

Do any of the wheels sound odd if you jack the car up and turn them by hand?

I'll have a look over the weekend.

From looking online it seems cheap sensors aren't recommended and that they can be a pain to fit as well. Is there a way to test them easily or is it T4 / O-Scope only?

[okenora]

here you go easy in situ ABS sensor test

[HarryM1BYT]

Originally Posted by okenora

here you go easy in situ ABS sensor test

That test will not on its own produce a conclusive result, when the ring is suspect. It is only good for confirming the sensor is at least working. What is needed to watch for - is a regular voltage transition, as the wheel is rotated at a steady speed. Any shorter than normal transitions, or any extra transitions - any irregularities.