Two thoughts....

Are you certain its not the trans clunking down a gear?

Does diameter of front vs rear rubber match exactly?

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

I had the same problem on my 90 300sel. Take each sensor out at the wheel and clean them they will have brake dust and little bits of metal on them from the brake pads and rotors. What happens is the sensor misses a count from the rotor and thinks it is locking up so it triggers the ABS unit

__________________
Keeping 'em Running
1990 300SEL
1994 E320
1989 E300

Ok. I'll report my findings.

Bye,

__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure

I have the same problem on my 124. That was a great question and great advice. I'd much rather clean something than replace it But one question, why would it only do it when you are about to stop?

__________________

Muleears
'07 E320 Bluetec 133K my DD
'04 Jaguar XJ8 VDP, 34K
'10 Hyundai Accent 60K Grocery Getter
'02 VW Golf soon to be on the road again
'97 E300 Diesel Son's DD
'61 VERY tolerant wife

Hampton Roads, VA USA

Gone but not forgotten:
'67 250S 95K
'86 300SDL
'87 300D Turbo, 364K! R.I.P.
'98 E300 Turbodiesel, 213K
'02 S420, 164K
'01 Prius 138K

Well, I did remove both front sensors today. I could indeed notice quite a bit of iron "dust" gathered around the tip of the sensor.

I cleared that out on both sides.

Then I looked down the hole with a flahlight. I could see the toothed wheel. It is rusted quite a bit, but I can clearly see that all teeth are still there.

So I used a steel pick (kind of screw driver but with a pointed end), and scraped every single "valley" between the teeth.

And, unfortunately, it didn't do a thing. Same symptoms.

I need to test everything before I start throwing expensive parts in there.

To be continued!

Bye,

__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure

My 1986 300sdl is doing the exact same thing. I took off both front sensors and they were very dirty with lots of metal filings on them. I cleaned them and sprayed brake cleaner into the holes where the sensors live. It looks pretty clean to me. This did not help. It still does this on occasion.
I have not pulled the rear sensor and cleaned it yet.
On an interesting side note, my alternator is not putting out the correct voltage. At ilde with a?c on and l;ights on and rear defogger on it barely puts out 11.5 volts. At 2000 rpm it barely gets to 12 volts. I have ordered a new alternator. I wonder if the voltage to the ABS computer is too low at idle speeds and throwing the system off. In hot sunny Louisiana, my a/c is always on and I find this happens mostly after I first drive away in the morning and I come to my first stop. Occasionally my ABS light will flash on at idle. My Overload protection relay is brand new.

I am going to change my alternator this weekend and see if this changes anything. If it still does it I will pull the rear sensor and clean it.

John

No, it is not tranny related.


Yes, they are identical and almost brand new. I've put on 4 Goodyear Assurance TripleThread. Threadwear index of 740, I'll see how long they last.

Thanks,

__________________
BigBen

'98 E300 Turbodiesel 244 000km
RIP '92 300D 2,5 Turbo 632 859,4km due to engine failure