Question about 2001 Mercedes-Benz C-Class

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BAS (Brake Assist System)

Hello.. I have a C 240 Mercedes Benz C Class 2002...Unfortunately the computer always tells me that there are 1 malfunction called the BAS... The malfunction does not always exist...It sometimes appears..But suddenly dissappear...I have contacted the authorized Mercedes Benz Shop due to this problem...But even after they fix my car the BAS still always comes out eventhough not regularly...thank you

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  • maylie May 14, 2009

    Hi There

    I have a C240 and started getting BAS warnings

    I showed this to merc care who advised that they was no problem when they checked it on the system and that due to me driving in heavy snow it could have trigged the warning to come up

    The problem has persisted and now everytime i press my brake pedal the warning comes up and my vehicle goes into ESP mode every so often

    Now i have shown this problem to merc care who advised that i need to replace my BAS control u nit

    But at the same time a friend of mine advised that BAS contriolunits very rarely get knackered and that it can be a sensor on my brake pedal that could be at fault

    Now the sensor cost £30 or so and the BAS control unit £900 for new of £390 for used with 90 day warranty

    Can any please advise as to a solution??????



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  • 6 Answers

Need to replace brake switch intermittent problem with them ....for lights bas, abs,asr,to go off..

Posted on Oct 11, 2008


I also have a C240 (2000 model) and I also have the BAS malfunction notice appear for my car. I called an RAC engineer to carry out a Diagnostics on my car and the BAS malfunction did not appear on his laptop. He said even if it did, only a MERC dealer service centre could reset the fault as it was a 'brake' issue and only they were allowed. My car does not brake any less or feel any less safe braking or driving, thus I feel the fault is a 'bug'. I hope to go to MERC and get the fault reset because it is becoming a pain as it is the only one showing on my dash!

Posted on Oct 01, 2008


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SOURCE: Brake Assist System

The brake light switch is the most common problem. Cheap & easy to replace as a first point. If this doesn't fix it you will need to get the fault codes read from the ABS system. Hope this helps & good luck !

Posted on Dec 14, 2008

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The brake light switch is the most common problem. Cheap & easy to replace as a first point. If this doesn't fix it you will need to get the fault codes read from the ABS system. Hope this helps & good luck !

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Kind regards
Dustin Ellse

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