[nysour335i]

I went to reset my brake mileage in the computer because it said i had 700 miles left on my rear pads. it was giving me a yellow car on a lift on startup. i did the procedure where you have the door closed, put the key in hold the mileage button and it comes up to reset. but once i did this, it threw a red brake light on the dash that is constant, the yellow lift changed to a red lift and now, it tells me "brakes at ----" after hitting the reset button. i tried disconnecting the sensor and reconnecting it in both front and rear and got nothing. any help would be appreciated.

[ashmostro]

New sensors?

[nysour335i]

Originally Posted by ashmostro

New sensors?

No but I didn't change th pads I just tried resetting the light because I checked the pads and they're at least 50%

[glachhman]

Originally Posted by nysour335i

No but I didn't change th pads I just tried resetting the light because I checked the pads and they're at least 50%

try unplugging the sensor and plugging it back in and then resetting it again. if not change the sensor.

[nysour335i]

Originally Posted by glachhman

try unplugging the sensor and plugging it back in and then resetting it again. if not change the sensor.

Yea but it's coming up both front and rear when originally it was just giving me a warning for rear now it won't let me reset either and they both have the ----- next to them, I read to try to jump the connector and then reset it, that sound like it would work?

[glachhman]

Originally Posted by nysour335i

Yea but it's coming up both front and rear when originally it was just giving me a warning for rear now it won't let me reset either and they both have the ----- next to them, I read to try to jump the connector and then reset it, that sound like it would work?

Should work, I just removed mine because the were squeaking too much. I spliced them and left it.

[nysour335i]

Originally Posted by glachhman

Should work, I just removed mine because the were squeaking too much. I spliced them and left it.

ok so i went out and bought a brand new rear sensor from bmw, take off my rear wheel, remove brakes which were at 50% if not more, replace new sensor and I'm still getting a code for rear brake wear sensor and it is still giving me ----- when i go to reset it.....someone please help me out here.

[ashmostro]

Replace both sensors at same time with new sensors and then try to reset. The reset won't hold for rear if front is also tripped and vice versa.

[Gugs]

U need to reset the brake service interval not the sensor. Lol

[Wolf 335]

Originally Posted by Gugs

U need to reset the brake service interval not the sensor. Lol

That's what he's been trying to do.

OP, maybe a battery disconnect would help clear any glitch.

[nysour335i]

Originally Posted by Wolf 335

That's what he's been trying to do.

OP, maybe a battery disconnect would help clear any glitch.

Yea I'm going to try that now, and the front one isn't tripped, when I check with bav tech tool I get a code for rear wear sensor, doesn't make any sense

[nysour335i]

ok so battery disconnect did nothing, still getting ---- when i turn the car on and try to reset the sensors. like i said i replaced the red sensor so it should have let me reset it once i did that, but it won't let me reset front or rear....im not going out and spending another 25 bucks on a sensor for front pads when they are almost brand new and going through all the hassle of replacing that sensor just to find out it won't fix my problem. I'm lost on this whole issue and about to just bring it in to the dealer. my fear is their going to tell me its the DSC unit which i know is BS because if i damaged the unit just by prematurely resetting the brake service light these cars are shit.

[Rmk392]

sometimes you have to replace both the rear and front sensor first, then reset the brakes through the car. I had same situation as you, I just had to replace my rear sensor but sometimes you need both.

[NA55]

Take old sensors and cut off tips then splice wires. Reset both front and rear.

[Wolf 335]

Did you inspect if you have any of the pins broken off in the female housing on the car?

Maybe one broke off and it causing problems

[nysour335i]

Thanks everyone for the advice and help, I ended go speaking with a tech over at BMW Whos a good friend of mine, told me right away, U need to do them together, has something to do with the 3 wire system they run on, but again thanks everyone for the input and Merry Christmas everyone😃

[Gugs]

Originally Posted by nysour335i

Thanks everyone for the advice and help, I ended go speaking with a tech over at BMW Whos a good friend of mine, told me right away, U need to do them together, has something to do with the 3 wire system they run on, but again thanks everyone for the input and Merry Christmas everyone😃

Thats complete nonsense

[nysour335i]

Originally Posted by Gugs

Thats complete nonsense

Well it worked so I guess it's not nonsense

[fazman]

Originally Posted by nysour335i

Thanks everyone for the advice and help, I ended go speaking with a tech over at BMW Whos a good friend of mine, told me right away, U need to do them together, has something to do with the 3 wire system they run on, but again thanks everyone for the input and Merry Christmas everyone😃

What do you mean by "You need to do them together..." does that mean you need to reset both fronts and rears separately but one after the other? or does that mean you need to put in two new sensors and then reset one after the other? or something else? Are you able to use the old sensors which are partially worn?

[ashmostro]

I think he means (and I agree) that if one sensor is showing as worn, the CBS logic won't let you reset the other even if it's new. You should physically replace both sensors, and then consecutively reset them via CBS stalk one after the other.

[NA55]

Originally Posted by ashmostro

I think he means (and I agree) that if one sensor is showing as worn, the CBS logic won't let you reset the other even if it's new. You should physically replace both sensors, and then consecutively reset them via CBS stalk one after the other.

How would physically placing the good sensor change anything if the resistance remains the same?

I recently replaced my rear brakes and after changing only rear pads and sensor, I reset both front and rear via CBS stalk and everything worked out just fine..

[ashmostro]

You're right, it shouldn't if the other sensor hasn't been tripped to the first stage (not open, but higher resistance). But I think the CBS logic is looking for a slightly difference resistance value, or perhaps a disconnect-reconnect sequence before it allows a reset.

All I can say for sure is, I have found the CBS logic to be ultra sensitive (probably too much so) and the only guaranteed method when nothing else has worked is to replace both sensors.

I've run shorted sensor wires in the past with no issues, so I agree in principle with what you are saying.