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  #1  
Old 04-18-2017, 08:58 PM
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Angry Can't reset brake pad wear warning without replacing sensor - more nanny bs!

This is a question/rant hybrid as I probably know the answer. Warning to others.

I changed pads and rotors but failed to reset the service nanny. The sensor is still perfectly fine -- I changed pads before the rotors touched the sensor. Now she's telling me that my pads are dangerously low and it's throwing the "red alert" brake warning. WTF is the point of a mechanical sensor if the computer is going to calculate mileage and throw the warning anyway? Are you telling me that I need to spend $30 on a new sensor when the old one is perfectly fine? How does it know it's a new sensor? Does it have a microchip with an ID? I'm hoping the new sensor will indeed let me reset it. I've had it with this nanny BS. My Z4M is a quiet little girl who never says a word unless something is actually wrong.
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Old 04-18-2017, 09:01 PM
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Following.

My wife's car just threw a warning for low brake pads (rear) and all the pads and sensors look fine.

The rear sensor may have been out of place a bit, but the filament looks intact.
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Old 04-18-2017, 10:37 PM
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I THINK the sensors are two stage. One stage wears to a point where the nanny can calculate the remaining mileage. When the other wears through you get the warning. I'm sure someone else will chime in.

On a new sensor no "filament" is visible.
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Last edited by Mackskibum; 04-18-2017 at 10:38 PM. Reason: Additional detail
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Old 04-18-2017, 10:43 PM
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There are the sensors, and then there is the Condition Based Service. It will count the miles from the last brake change and will display the warning, regardless of the condition of the sensors.
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Old 04-18-2017, 11:53 PM
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Did you reset brake service via in-dash odometer reset button?
https://www.youtube.com/watch?v=6rFVYCY1QIA
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Old 04-19-2017, 12:22 PM
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You didn't reset the service warning. If your sensor is fine that's your problem. The sensor is very basic--it's either broken (worn till the metal bridge breaks between the wires) or it's not. They're also kinda fragile/brittle. I broke mine, even though it was not rubbed, on my X5 in the rear when I did the breaks and had to replace it.
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Old 04-19-2017, 12:23 PM
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RESOLVED

Picked up a new sensor at AAP for $30 after tax. It's quite a bit thicker than my old one so I was mistaken in saying my old one wasn't worn. This is what I learned and why I was confused:

1) The "miles left" continues to count down even if you change pads and the rotor is no longer contacting the sensor.

2) As long as "miles left" isn't zero or negative, you can reset the sensor -- I did this with the rear.

3) Once "miles left" goes negative, you are no longer able to reset until you replace the sensor with a new one.
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Old 04-19-2017, 12:53 PM
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Quote:
Originally Posted by RADRACR View Post
RESOLVED

Picked up a new sensor at AAP for $30 after tax. It's quite a bit thicker than my old one so I was mistaken in saying my old one wasn't worn. This is what I learned and why I was confused:

1) The "miles left" continues to count down even if you change pads and the rotor is no longer contacting the sensor.

2) As long as "miles left" isn't zero or negative, you can reset the sensor -- I did this with the rear.

3) Once "miles left" goes negative, you are no longer able to reset until you replace the sensor with a new one.
When a warning in the dash is "orange", miles left is more than 0 and the counter can be reset from the dash. Once the miles go below zero, the warning turns "red" and it can be reset only with a scanner. The sensor has to be replaced only if worn out. When the sensor has been worn out and counter below zero, the codes has to be erased from the DSC module and the counter reset in the CBS menu.
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Old 04-19-2017, 01:01 PM
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As I understand it the sensor is simply a wire. There is no intelligence in the sensor. First stage when the rotor wears away at the sensor until it touches the wire you will get a break pad warning. Second stage when the rotor wears through the wire completely you get a brake pad critical warning. I have over the years reused unworn sensors with success. Possibly one needs to remove and reconnect the sensor for a reset?
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Old 04-19-2017, 01:14 PM
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My experience is not consistent with either of you guys. Oh well. It's fixed. I relayed the information that worked for me.
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