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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 06-13-2013, 01:29 PM
Bluemill Bluemill is offline
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Mein Auto: 2008 328xi, 2000 Corvette
Can't reset Brake light.....going to snip and splice.

Dear Uber Techs,

I have tried all types of reset procedures regarding a rear brake warning light reset with out success. I keep coming up with 2 things among the threads I read. When you replace the pads, replace the sensor. A couple of people said they cut the old sensor wire, and then spliced the 2 leads together. After that, they were able to reset the brake light. It's worth a try, for at very least, I probably should try a new sensor anyway, and they are not that pricey. I know it defeats the brake pad low warning system, but as this respondent said, you can check your pad thickness fairly easily by just looking down at your pads through the spokes of your wheels.

Cal, I do not want to buy the BT BMW reader for like hundreds of dollars. It's possible I may go Audi next time and the BMW BT cable would be a huge waste. Are you really sure there isn't a method of reading the code without one of these devices???

The history of this problem is pretty widespread. I could not believe the number of entries on the topic.

We should call this procedure a "Brake Warning Light Vasectomy."

I will advise the "Fest" of my success or lack thereof. We really have to follow through on this- otherwise we will continue to screw up in the same way, over and over, and over......

Best,

Bluemill
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  #2  
Old 06-13-2013, 03:30 PM
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Zeichen311 Zeichen311 is offline
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Mein Auto: '11 335xi Sedan
If you have not replaced the sensor, do so (<$25). If there is even the tiniest electrical flaw in the sensor (not unlikely when reusing it) the system will refuse to reset.

Next: The CBS system may ignore reset commands if it feels insufficient time/mileage/wear has elapsed since the last reset. Basically, it considers the multiple resets part of a single service event and may not change its mind until "enough" time/mileage in service has elapsed. (I did not think this applied to the brake sensor reset but perhaps it does.) If you cannot reset the light with a new sensor installed, drive a few thousand (yes, thousand) miles before trying to reset it again.

If you can't live with a warning light for that long and don't want to spend a small fortune on a one-shot tool, just visit an BMW-specialist indie shop or dealer to have the CBS & warning light reset. It shouldn't cost more than an hour's labor.
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   N47 35' 30.13" E11 10' 33.36" - End of break-in...you can guess what came next. BMW CCA

Last edited by Zeichen311; 06-13-2013 at 05:45 PM.
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  #3  
Old 06-13-2013, 04:42 PM
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lqaddict lqaddict is online now
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Can't reset Brake light.....going to snip and splice.

This genius should know the answer

http://imgur.com/a/9hMyJ



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  #4  
Old 06-13-2013, 05:51 PM
roadkillrob roadkillrob is online now
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If the light went off and you replaced the pads you have to replace the sensors, they are a wear item and if they are set off, they are throw away and won't work again.
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  #5  
Old 06-13-2013, 06:29 PM
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Zeichen311 Zeichen311 is offline
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Quote:
Originally Posted by roadkillrob View Post
If the light went off and you replaced the pads you have to replace the sensors, they are a wear item and if they are set off, they are throw away and won't work again.
^ And this. I didn't mention it because I thought I recalled another post from the OP that stated the sensor had been replaced already....
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   N47 35' 30.13" E11 10' 33.36" - End of break-in...you can guess what came next. BMW CCA
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  #6  
Old 06-14-2013, 11:26 AM
Bluemill Bluemill is offline
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Location: Scituate, MA
 
Join Date: Sep 2010
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Mein Auto: 2008 328xi, 2000 Corvette
I guess I should just get the sensor.....

If it's just a $25 part what the hell, I'll just get a new one on the way home tonight. The splice it idea sounds awfully tempting though. I'm trading the car in like 3-4 mo.

The read on the brake service is -15,000 miles, and I can not make it move. I'm getting the red rear brake warning light under the services needed.

Best,

Bluemill
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  #7  
Old 06-15-2013, 07:36 PM
Bluemill Bluemill is offline
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Location: Scituate, MA
 
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Mein Auto: 2008 328xi, 2000 Corvette
Fixed it- finally

The ultimate fix was replacing the pad wear sensor. Even with that, the reset was not straight forward. I got it to happen on the 5th attempt. I tried with the engine on, and engine off. No reset. Drove the car out of the garage, for initially I thought it would be quick so I started it inside. Then I tried holding the up toggle and then without. I drove it back into the garage, thinking it was going to take a trip to the dealer to get it done. Each time I tried, and hit the BC button for the reset, it would immediately go ding, and not reset. The Icon would go back to the red car on the lift.

Then I gave it one more hail Mary, before I gave up for the night, for it was 11 pm. Engine on, foot on service brake, press ODO button. Yellow triangle comes up, and this time, as it went directly into the rear brake icon in red light, I hit the BC reset, and this time I finally got the clock, and although the clock went away fast, it didn't ding, and go back to service needed icon. I just kept holding it for 30 seconds, and nothing happened. Then it dawned on me, every attempt before, it always immediately failed and went back to the red car on the lift.

I cycled through all the service icons, and the service rear brakes were now in amber, Not red, and below it read 30,000. Home free!!

Not knowing what an unworn sensor looks like, and not focusing on that warning thread about "Always replace the sensor," I took the wrong course of repair. One video showed removing a sensor that had a broken neck, right on the end of the contact plug, while mine was 100% OK, and I had one of the connecting metal clips, so I thought I had a good sensor. The top of the sensor was worn though, and just a bit of metal was showing through the plastic after being worn off by the rotor. It was subtly "cooked." I was also confused that at first I had other service warnings, namely the big S with the circle in the middle, which I'm told is a 1 year service reminder- regardless of mileage. It was coincidence that both issues happened together, and that threw me off too.

I was able to use the AutoZone pads though, and the sensor clipped in perfectly. Stopping is great, quiet, no squeeks, and there are no warning lights!!! I also see little brake dust, as these look like semi-mets, much less organic. Live and learn....

See you at the next fix crisis.......

Best,

Bluemill

Last edited by Bluemill; 06-15-2013 at 07:42 PM.
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