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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Suspension | Brakes | Chassis > Reset Pad Life - Front and Rear Brakes Show Need to be Replaced



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      12-19-2012, 11:25 AM   #1
335aw
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Reset Pad Life - Front and Rear Brakes Show Need to be Replaced

I am so ticked. I didnt want to deal with a brake fluid flush so i took it to an indy to have it done. They brought the car up front and they saw that it needed to be reset. So they did.

Well I dont know what the heck happened but now my brake fluid indicator is off but my front AND rear brakes are showing that they need new pads with the service indicator (car on lift).

History: My front pads are perfectly fine and have a lot of life on them. They were changed by the dealer before warranty expired about a year and a half ago. My rears were bad so i changed them BEFORE the wear sensor had tripped. The car never told me i needed new pads. I did NOT change the wear sensor when i did the rears.

Now back to where we are now. They want me to change the wear sensor out on the rears and then try to reset it again. The car is claiming the rear pads are like 255% life or something.

Is it possible that the rears are saying this when they reset them if i didnt change the sensor AND the sensor never fully tripped stating that they needed to be replaced... keep in mind they may have some wear on the sensor just not to the point of the car telling me that i need to change them. Now with all of that, why would the car tell me I need to change the fronts too?

Can anyone explain this or what I should do? I am being told to change the rear sensor and if that doesnt fix it to change the front sensor too... such BS! and the indy doesnt want to own up to doing it since it was perfectly freaking fine before they touched it.

Thanks.
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      12-19-2012, 01:28 PM   #2
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here you go

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      12-19-2012, 01:30 PM   #3
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Quote:
Originally Posted by idrift4wd View Post
here you go

I did this too. When I do I get ------- for front and rear when I reset them. Any ideas as to why.
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      12-19-2012, 06:51 PM   #4
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Quote:
Originally Posted by jewrican View Post
I did this too. When I do I get ------- for front and rear when I reset them. Any ideas as to why.
could be a few reasons,

1. low pad life

2. faulty sensor

3. try it again and drive around. hopefully it will reset.
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      12-20-2012, 04:24 PM   #5
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I think this is a known issue. Try searching around for it, but you will probably have to bring the car in to get it reset if doing it through the stalk doesn't work for you.
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      12-23-2012, 09:04 PM   #6
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I dont have clarification yet... but i believe that since the rears had worn a little bit though the sensor (it is a sensor that varies voltage as it wears) it will not reset. It is showing 255% life because i believe it is a binary number (all 1's = 255). Since the front pads are a little older but not dead.. it is also wearing. So because this clown tried to reset my fronts as well, it is now doing the same up there.

I will replace the rear sensor since i never did and will just change my front pads early and reset that sensor as well. Ticks me off though! I will take responsibility for the rears.. but the fronts.. this is the shops fault.. they never should have touched the front indicator.. i think they did it when they reset the rears and it was yelling i needed new brakes.. so they said.. hmm ill reset the fronts too then..
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      12-27-2012, 10:53 AM   #7
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It's highly recommended that you change the sensors EVERYTIME you change your pads, which COULD explain the rear. As for the front, have no idea.
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      12-27-2012, 08:00 PM   #8
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It's not the sensors. I would have this issue randomly about once a year (once it occurred soon after a brake pad change, which i attribute to coincidence). The only way to fix it (without doing crazy stuff like shorting out the sensor as some say will work) is to use a BT tool to reset the interval (only worked on some versions of BT software, I think I posted which over on BB) or take it to the dealer to have them reset (at a cost of like 75, but don't let them tell you it needs new sensors because that's bullshit).

Hopefully you have a BT tool.
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      12-27-2012, 08:31 PM   #9
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Quote:
Originally Posted by 335iSSA View Post
It's not the sensors. I would have this issue randomly about once a year (once it occurred soon after a brake pad change, which i attribute to coincidence). The only way to fix it (without doing crazy stuff like shorting out the sensor as some say will work) is to use a BT tool to reset the interval (only worked on some versions of BT software, I think I posted which over on BB) or take it to the dealer to have them reset (at a cost of like 75, but don't let them tell you it needs new sensors because that's bullshit).

Hopefully you have a BT tool.
hmmm. id love to hear more info on this.

I only have the coding cable and all of the software the software package to pull codes and code the car etc.

The indy tried to reset it with three software packages though... i am going to see if i can try it with the cable and mine tonight.

Thanks for the input. I really appreciate it. i just finished buying new pads and rotors.. ill be happy and pissed if you are right hahhaha
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      12-28-2012, 03:14 PM   #10
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Quote:
Originally Posted by jewrican View Post
hmmm. id love to hear more info on this.

I only have the coding cable and all of the software the software package to pull codes and code the car etc.

The indy tried to reset it with three software packages though... i am going to see if i can try it with the cable and mine tonight.

Thanks for the input. I really appreciate it. i just finished buying new pads and rotors.. ill be happy and pissed if you are right hahhaha
Not sure what more I can add. When you look at the service interval i would get either dashes (------) and not a number or something totally stupid like a huge negative number. It was frustrating and apparently not that uncommon, the dealers should reset it for free as it's a problem.

I know nothing about the coding but I'm sure one of the experienced guys can help you find the right place using INPA (or IPNA).
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      12-28-2012, 06:39 PM   #11
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If the sensor has ANY wear on it, the CBS will not reset. You need a brand new sensor or splice the wires together to complete the circuit and fool the car into thinking there is a new sensor. Obviously the second method will render the sensor useless and you will have to manually check the pad thickness from time to time.
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      12-30-2012, 11:43 PM   #12
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threw new pads on the front (with a new sensor of course) and a new sensor on the rears and we are back in business now.
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      01-03-2013, 02:52 AM   #13
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The sensor is like a beer can it goes off when it gets crushed. Therefore it cannot be reused nor can it tell you exactly how much pad life is left. Not sure where your seeing percentages and all.
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