SLK/R170: BAS ASR light
Thread Starter
Newbie
Joined: Jun 2010
Posts: 1
Likes: 0
1999 slk 230 kompressor
BAS ASR light
About a month ago my bas ast light illuminated after restarting my car it cleared since then it's came on a few more times. Ive heard it's probably the brake lamp switch. Is there a process I can do to test to see if the switch is bad like hold my foot on the pedal and release or something? Also sometimes my brakes are weak in reverse but the light has never been on when that happened. I just want a way to see if the switch is bad without a tester to ease my fears because I'm out of town and won't be able to tale it in for a week.
Super Member
Joined: Dec 2007
Posts: 849
Likes: 45
From: ATL
2017 GLS 550
ours was caused by the steering angle sensor and the Yaw Rate sensor... believe me they are not cheap $$$$!
if you are ever driving down the road and the car jerks hard and the light starts going nuts then one or both of those are your issue.
hope that is not the case.
if you are ever driving down the road and the car jerks hard and the light starts going nuts then one or both of those are your issue.
hope that is not the case.
MBWorld Fanatic!
Joined: Mar 2002
Posts: 1,537
Likes: 2
From: Arizona, USA
W205 C300
According to the BAS brake assist literature from Mercedes, the system measure and learns how fast the driver presses the brake pedal in normal stops and then if the driver pushes it faster than normal, the system applies full braking because it assumes that this was a panic stop. There must be a sensor used for pedal speed that could be faulty as well.
MBWorld Fanatic!
Joined: Apr 2007
Posts: 6,171
Likes: 16
300E a couple 1994 w124wagon E320 Wagon/,1971MGB Track/Rally, MG Midget Autocross ,2000 E320 wagon.
It's the
brake switch.
Under 20 bucks
diy similar to the w210 and that diy is on www.benzworld.org w210 diy section at the top of the forum.
autohausaz.com caarries the oem switch
Under 20 bucks
diy similar to the w210 and that diy is on www.benzworld.org w210 diy section at the top of the forum.
autohausaz.com caarries the oem switch
Newbie
Joined: Aug 2014
Posts: 2
Likes: 0
mb e class 1998 220cdi
bas asr light
after replacing the brake vacum servo, i have started to get the bas asr light illuminated,i have replaced the brake switch 2 times now with the same result,and i have observed that when having the brake pedal depressed the light stays off until the next time use the brakes ,the light then comes on when i release the pedal, can anyone give any advice?
