ABS/ BAS ESP light keeps coming on - Mercedes-Benz Forum
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#1 (permalink) Old 01-05-2009, 11:13 AM
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Exclamation ABS/ BAS ESP light keeps coming on

I have a CLK 430 and my ABS/ BAS ESP light keeps coming on. I have read many forums regarding this topic and have just about everything I can imagine on my car. The light comes on only when I'm driving for about 15- 20mins into the highway and doesn't turn off until I turn my car off again. Once I turn my car back on the light goes away. I have replaced all my ABS Sensors, brake light switch, ABS Hydraulic Pump, Valve Body, input and out speed sensors above the valve body......and nothing. I don't know what else to do. Can anyone help me? I feel like blowing the car up. Its frustrating!
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#2 (permalink) Old 01-05-2009, 01:19 PM
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Originally Posted by illcuz01 View Post
I have a CLK 430 and my ABS/ BAS ESP light keeps coming on. I have read many forums regarding this topic and have just about everything I can imagine on my car. The light comes on only when I'm driving for about 15- 20mins into the highway and doesn't turn off until I turn my car off again. Once I turn my car back on the light goes away. I have replaced all my ABS Sensors, brake light switch, ABS Hydraulic Pump, Valve Body, input and out speed sensors above the valve body......and nothing. I don't know what else to do. Can anyone help me? I feel like blowing the car up. Its frustrating!
I had the same prob b4 and it came on like 3 minutes within driving and wont go away till i turned the car off.. All what i did, i changed my pads and prob was gone.
B4 that, took my car to my mechanic and ran the diagnostic on it and everything was fine and last resort, he asked me to change the pads and honestly it went away since that time.
Otherwise, i would not know ...
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#3 (permalink) Old 01-06-2009, 12:36 AM
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does the car cut out or sputter? mine is doing it when i floor it, the light comes on and the car sputters. i limp over to the side of the road, shut it off and turn it on and away i go

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#4 (permalink) Old 01-06-2009, 08:40 AM
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No my car doesn't cut out and yes when I do pull over and turn off the car then turn it back on the lights go away. Thats doesn't correct the problem because later on they turn back on again.
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#5 (permalink) Old 01-10-2009, 10:26 AM
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it could be a simple sensor replacement that costs $15 from autohaus.com

check out a couple prior threads on this topic. I have the same problem as well, and it keeps coming on and off....

Do this first, before spending major bucks
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#6 (permalink) Old 01-13-2009, 04:41 PM
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May want to check it for codes again with an SDS (when the light comes on), don't cycle the key, and also check actual values of all the brake system including the brake booster diaphragm membrane travel sensor which monitors motion of the vacuum diaphragm inside the booster.

Also remember those stop lamp switches are cheap and no better than the old one you took off, so you may have a bad (new) one.

Do you have any after market equipment installed like a TV system or anything that may need to see a brake light signal?

Oversized wheels?

You may need to reset parameters.
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#7 (permalink) Old 01-13-2009, 06:18 PM
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When you first turn your car on & the warning lights are off, do they come on as soon as you step on the brake? If yes, itks clearly your brake switch & an easy fix ($15-$20). Your brake lights will probably not function properly either if your brake switch is defective.
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#8 (permalink) Old 01-14-2009, 08:56 AM
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May want to check it for codes again with an SDS (when the light comes on), don't cycle the key, and also check actual values of all the brake system including the brake booster diaphragm membrane travel sensor which monitors motion of the vacuum diaphragm inside the booster.

Also remember those stop lamp switches are cheap and no better than the old one you took off, so you may have a bad (new) one.

Do you have any after market equipment installed like a TV system or anything that may need to see a brake light signal?

Oversized wheels?

You may need to reset parameters.
I do have oversized wheels (20in wheels). How do I reset parameters? You also mentioned checking values of all brake system including the brake booster diaphragm membrane travel sensor which monitors motion of the vacuum diaphragm inside the booster. How do you check that and what value is it suppose to be? I have spent over $1500 in trying to fix this problem and I have failed every single time. Please do help me
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#9 (permalink) Old 01-15-2009, 05:44 AM
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Cool

Find a tire size calculator on the internet. Bump them up against stock tire sizes to see how dramatic the diameter changed. Not sure of the exact figure, but if its dramatic it'll cause problems like that. (ie. car being a
'99: stock front is 225/ 45R-17; comparable size would be 225/ 30R-20.)
Play around with the calculator. If your way off then...

Also, I would follow the recomendation of ordering a new stoplamp switch.
Very possible 'Bad From Stock'.

How are the brake pads?


--John
2006 CLS500

Last edited by unlukky; 01-15-2009 at 05:55 AM.
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#10 (permalink) Old 01-15-2009, 08:50 AM
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Originally Posted by unlukky View Post
Find a tire size calculator on the internet. Bump them up against stock tire sizes to see how dramatic the diameter changed. Not sure of the exact figure, but if its dramatic it'll cause problems like that. (ie. car being a
'99: stock front is 225/ 45R-17; comparable size would be 225/ 30R-20.)
Play around with the calculator. If your way off then...

Also, I would follow the recomendation of ordering a new stoplamp switch.
Very possible 'Bad From Stock'.

How are the brake pads?
The brake pads are ok. I checked the tire size calculator and its 1.37% too slow. How do I bring it up to par? How do I program it to the new size?

Last edited by illcuz01; 01-15-2009 at 10:12 AM.
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