ABS light on 1993 E280T

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R. Broekstra - 22 Oct 2007 13:32 GMT

Hey all,

I have a problem with the ABS on my newly acquired E280T. The problem is
similar to the problem described here:
http://groups.google.nl/group/alt.auto.mercedes/browse_thread/thread/3722d7d0896
66c1a/eb0d18e0de29a021?hl=nl&lnk=gst&q=w124+abs#eb0d18e0de29a021

---- 8< ----
1. Start car, ABS system passes all diagnostics and light goes out.
2. I drive for about 1/2 Km, and ABS light comes on and stays on.
3. I stop somewhere for about 10 mins.
4. I start car again and set off, ABS light does not come on even after
many miles, BUT when I brake the ABS cuts in at about 5MPH irrespective
of the road surface conditions.
---- 8< ----

I read that a good first try would be to clean all speed sensors on the
car, and check whether the problem persists. Does this seem reasonable?

Do I need new sensor retaining bolts if I take the sensors off the car,
or can I just leave the sensor in place while cleaning them?

Thanks,
--
Rien

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Roland Franzius - 22 Oct 2007 16:47 GMT

R. Broekstra schrieb:

> Hey all,
>
[quoted text clipped - 16 lines]
> Do I need new sensor retaining bolts if I take the sensors off the car,
> or can I just leave the sensor in place while cleaning them?

Had a similar problem with a '98 C240 brake system.

Errorcode told us about a bad brake light switch contact.

After some irregular signals from the brake switch the complete
ABS/ASR/emergency break/Tempomat system is switched off and the motor
management uses the emergency low power program.

Replacement of the switch cured everything.

Signature

Roland Franzius

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corix - 23 Oct 2007 03:37 GMT

i have 2 experiences when the ABS lit up internittently. Car #1 - voltage
was not sufficient, alternator not doing its job so voltage drops. ABS goes
off at next sense cycle. Car#2 - problem traced to ABS unit. Got a rubber
mallet and gave the ABS pump a solid whack. Fixed it.

> R. Broekstra schrieb:
>> Hey all,
[quoted text clipped - 26 lines]
>
> Replacement of the switch cured everything.

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Cam - 25 Oct 2007 17:50 GMT

> Hey all,
>
[quoted text clipped - 20 lines]
> --
> Rien

Check your speed sensors, there are 4 of them near the brakes, is this a
used new vehicle? If it's a used then someone could have disabled the ABS
sensor and reconnected it poorly, or it's dirty.

Reply to this Message

Cam - 25 Oct 2007 18:01 GMT

>> Hey all,
>>
[quoted text clipped - 24 lines]
> used new vehicle? If it's a used then someone could have disabled the ABS
> sensor and reconnected it poorly, or it's dirty.

Your tires, are they all the same size? If there is a great difference,
then that could be your problem. ABS system compares and looks for a sudden
change of speed, mixing tires could have an negative effect.

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