anyone knows the idrive logic when calculating
how many miles to do before brake pad needs to be replaced?
From what I read it seems only to light up if the brake sensor is broken (grinds away to expose the connection), so does the car have any other logic when calculating how much brake time is used at what speed?
Not exclusive to iDrive.......
The brake wear displays (seperate for front and back) also are an menu item service info that appears on the dash computer of non iDrive equipped units. Accessing of that menu is by means of the up down button on the stalk (and sometimes the pushbutton). Rather arcane until you get the hang of it.
The car's computer rates your driving by integrating accelerations, average speed, etc, and knows if you are doing a lot of stop and go or highway driving. I know for a fact that it recalculates service interval (mine was shown as required at under 14K mi - stop and go) and I am 99% sure it is used in the a calculation of a brake wear estimate.
You do not think a warning light until you cut the sensor in the pad. On the E46, this was with 1 mm of pad left. The E46 just gave you a light with no indication of front or back. The dash warning on the E90/92 doesn't either, but the service info could give you a clue without taking wheels off.
The sensor is cut and has to be replaced. I am not not sure how you get the light off on the E90, but I bet you dollars to donuts (if the donuts have sprinkles) you can do it with the stalk.http://forums1.roadfly.com/preferenc....php?img=99782
did you replace your pad after the sensor was cut?
or you did it based on its miles remaining estimate and saved yourself a sensor which is like $15?
is the labor meaningfully cheaper if you replace the pad before the sensor is cut?
Replaced pad and rotor after sensor was cut...