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      07-26-2018, 09:52 PM   #1
f80clone
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F30 brake reset impossible

Hey guys i know there already a lot of threads about this, but i still cant find the answer. So i changed all the pads on my car (2012 328i F30) and left my front sensor because it was still good, the rear sensor was tripped so i replaced it, and now it says that "Brake reset impossible" and this is only for rear pads, front reset worked just fine, and i tried unplugging it and plugging back in and all that even tried looping it with a wire just to be able to reset it, no luck, any thoughts on this? Or maybe someone that had the same issue and found a solution for it.
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      07-26-2018, 11:22 PM   #2
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Quote:
Originally Posted by f80clone View Post
Hey guys i know there already a lot of threads about this, but i still cant find the answer. So i changed all the pads on my car (2012 328i F30) and left my front sensor because it was still good, the rear sensor was tripped so i replaced it, and now it says that "Brake reset impossible" and this is only for rear pads, front reset worked just fine, and i tried unplugging it and plugging back in and all that even tried looping it with a wire just to be able to reset it, no luck, any thoughts on this? Or maybe someone that had the same issue and found a solution for it.
BMW changed to a two-stage brake sensor doo-dad some years ago. The first wear wire gives the computer a reading on how fast you're using up the pads, the 2nd is the drop-dead replacement warning.

Because of the fact that the first wire is not intact, no reset is possible. Replace the front wear sensor.
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      07-27-2018, 07:31 AM   #3
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What are you using for a diagnostic tool? A good one, like the Foxwell NT510, can tell you if there are any active codes and clear any old codes, which may be necessary before you can do a reset. I had the rear warning trip and it wouldn't reset until I changed the sensor, but as I recall after changing the sensor I cleared all the codes before I did the reset.
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      08-07-2018, 03:24 PM   #4
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Quote:
Originally Posted by Billfitz View Post
What are you using for a diagnostic tool? A good one, like the Foxwell NT510, can tell you if there are any active codes and clear any old codes, which may be necessary before you can do a reset. I had the rear warning trip and it wouldn't reset until I changed the sensor, but as I recall after changing the sensor I cleared all the codes before I did the reset.

For diagnostic i used my friends i forgot what brand it was, but it can do a lot of things, so we went a checked my brake system and it had a code ---480A14 Brake pad wear sensor: Rear axle, plausibility---

So this was with an aftermarket sensor from ebay, then i went to the dealer and bought a new one OEM, replaced it, and still same thing and this code, everytime i erase it it comes back on like same second, so even erasing through diagnostic tool is not helping, any one have any ideas?
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      08-07-2018, 03:28 PM   #5
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here is a photo of the code that i have now, with Brand NEW pads and Brand NEW OEM sensor
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      08-07-2018, 04:07 PM   #6
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I had the same problem when I replaced my pad and reused the old sensor. I put a new sensor and I was able to reset it.
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      08-07-2018, 05:06 PM   #7
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Try unplugging the sensors, at the chassis connections, not the pads, and then clear the codes. Plug them back in, see what happens.
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      08-12-2018, 11:44 PM   #8
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Quote:
Originally Posted by Billfitz View Post
What are you using for a diagnostic tool? A good one, like the Foxwell NT510, can tell you if there are any active codes and clear any old codes, which may be necessary before you can do a reset. I had the rear warning trip and it wouldn't reset until I changed the sensor, but as I recall after changing the sensor I cleared all the codes before I did the reset.
Were you able to reset the brake warning light on your F30 with Foxwell NT510?
Looking to buy a good OBD scanner and thinking of Foxwell, not sure which model yet
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      08-13-2018, 06:56 AM   #9
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Yes. It will also tell you why a reset isn't possible when that happens.
http://f30.bimmerpost.com/forums/sho...2#post23288222
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      08-15-2018, 03:52 PM   #10
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Quote:
Originally Posted by Billfitz View Post
Yes. It will also tell you why a reset isn't possible when that happens.
http://f30.bimmerpost.com/forums/sho...2#post23288222
Just bought a Foxwell 520 Pro, and here is what i get. No matter unplugging the sensor or plugging back in and resseting the code, pops up right away, and no matter unplugging the front one or not, still same error, any help would be really appreciated as im tired of driving with that light on.
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      08-15-2018, 04:03 PM   #11
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This might help you:

https://garagetalkmsge.wordpress.com...light-problem/

I'm assuming the Foxwell is able to reset the CBS?
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      08-15-2018, 04:54 PM   #12
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Yeah i can reset it, i saw the link that you gave me before, it looks like he does some sort of correction with that special tool, not just reset, so at this point im lost
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      08-15-2018, 04:55 PM   #13
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Quote:
Originally Posted by Billfitz View Post
Try unplugging the sensors, at the chassis connections, not the pads, and then clear the codes. Plug them back in, see what happens.
What do you mean "chassis connection, not the pads" , where is chassis connection?
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      08-15-2018, 08:04 PM   #14
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Why not just replace it? It's only a $12 part. In some cases, it comes with the pads.
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      08-15-2018, 08:41 PM   #15
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Quote:
Originally Posted by f80clone View Post
What do you mean "chassis connection, not the pads" , where is chassis connection?
The sensor plugs onto the pad on one end, the other plugs into a connector that's hanging from a clip that's attached to the chassis. I suggested that because when I changed my pads and left the original sensor in place I couldn't clear the codes. I had a new sensor, so I swapped it and then the codes cleared. I didn't bother to examine the old sensor to see what it was about it that the car could tell that it hadn't been replaced, but I figured that maybe disconnecting it from the chassis connector triggered something in the control module. It could even be that the old sensor would work if it's disconnect to trigger the module and then reconnected. If I didn't have a new sensor I'd have dug deeper and figured out how to reuse the old one, but I had the new sensor.
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      08-15-2018, 11:27 PM   #16
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Quote:
Originally Posted by Sam! View Post
Why not just replace it? It's only a $12 part. In some cases, it comes with the pads.
sensor is brand new from BMW dealer
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      08-15-2018, 11:30 PM   #17
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Quote:
Originally Posted by Billfitz View Post
The sensor plugs onto the pad on one end, the other plugs into a connector that's hanging from a clip that's attached to the chassis. I suggested that because when I changed my pads and left the original sensor in place I couldn't clear the codes. I had a new sensor, so I swapped it and then the codes cleared. I didn't bother to examine the old sensor to see what it was about it that the car could tell that it hadn't been replaced, but I figured that maybe disconnecting it from the chassis connector triggered something in the control module. It could even be that the old sensor would work if it's disconnect to trigger the module and then reconnected. If I didn't have a new sensor I'd have dug deeper and figured out how to reuse the old one, but I had the new sensor.
oh got you, yeah ive done that too, even tried unplugging it completely then do reset and plugging new one back in and do reset again, seems like nothing at all works for that stupid code
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      08-16-2018, 05:42 AM   #18
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Is there a way to test the sensor, might be duff?
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      08-16-2018, 07:05 AM   #19
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I'm sure there is, but someone would have to analyze how the sensor works to determine how to test it.
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      08-16-2018, 07:24 AM   #20
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I thought the sensor was simply 2 switches, so 3 wires which when it starts to wear simply breaks the first followed by more wear and then the second.

If what I’ve said above isn’t ballony then there should be continuity between the contacts.
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      08-16-2018, 07:53 AM   #21
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Some searching turned up this:
https://www.moderntiredealer.com/art...warning-lights

And this:


And this:
https://wiki.bentleypublishers.com/d...W+5+Series+E60

You should be able to test the sensor with a DMM, measuring the resistance between the two pins on the chassis connector plug end. It should be at most a few ohms. A high reading or an open circuit would indicate a bad sensor.
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      08-16-2018, 08:18 AM   #22
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Yeah i thought it could be a bad sensor so i went back to the dealer and exchanged it with another new one, still same thing
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