E55 BAS Problem - Mercedes-Benz Forum
 
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post #1 of 5 (permalink) Old 11-26-2018, 05:10 AM Thread Starter
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E55 BAS Problem

I have a 2001 E55 with 124K miles that seems to be randomly activating the BAS at highway speeds when lightly touching the brakes. This means I am getting full brake when I am only applying very light brake pressure and it momentarily triggers the ABS to prevent the front wheels from locking. It releases brakes and deactivates the BAS a second after I take my foot off the brake pedal. I have no BAS / EPS warning lights in the dash.

Obviously, this is dangerous and I have unplugged the BAS / EPS module. Any ideas where to start trouble shooting? I think these cars also have yaw and steering angle sensors that are inputs for the BAS / EPS?

Thanks in advance!
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post #2 of 5 (permalink) Old 11-27-2018, 06:05 PM
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You should post this question in the regular W210 forum because there's a lot more people there. There's nothing specific to the E55 regarding BAS or ABS so it's OK to post over there.
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post #3 of 5 (permalink) Old 11-28-2018, 08:37 AM Thread Starter
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Originally Posted by illstplaya View Post
You should post this question in the regular W210 forum because there's a lot more people there. There's nothing specific to the E55 regarding BAS or ABS so it's OK to post over there.
Will do. Thanks for the tip!
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post #4 of 5 (permalink) Old 12-03-2018, 12:11 PM
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Originally Posted by s38junkie View Post
I have a 2001 E55 with 124K miles that seems to be randomly activating the BAS at highway speeds when lightly touching the brakes. This means I am getting full brake when I am only applying very light brake pressure and it momentarily triggers the ABS to prevent the front wheels from locking. It releases brakes and deactivates the BAS a second after I take my foot off the brake pedal. I have no BAS / EPS warning lights in the dash.

Obviously, this is dangerous and I have unplugged the BAS / EPS module. Any ideas where to start trouble shooting? I think these cars also have yaw and steering angle sensors that are inputs for the BAS / EPS?

Thanks in advance!
Did you scan for errors and what are the error codes?

Also did you recently changed your battery and forgot to reset the BAS.


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post #5 of 5 (permalink) Old 12-04-2018, 02:59 PM Thread Starter
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Did you scan for errors and what are the error codes?

Also did you recently changed your battery and forgot to reset the BAS.
I'm not getting any error codes or warning lights on the dash.

I suspect it is either the membrane travel sensor and / or the brake booster. Is it possible to replace just the travel sensor? Anyone have the correct part #?

Mike

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