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      09-30-2008, 11:21 AM   #43
GT3 Tim
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Drives: 2008 E90 M3
Join Date: Feb 2008
Location: Sacramento, CA

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Originally Posted by lucid View Post
To the best of my knowledge, the brake sensor is a binary switch. It comes on when the pad wears out to the degree that a ground loop is broken. So you might be correct in that the system is using some other data stream to guess at what's left.
Roger that.

The warning light goes off when the rotor eats through the sensor. Obviously, the "life remaining" is an estimation based on some other data.
Tim (apparently likes "3" cars)
E90 M3 -- Current ride
2004 GT3 -- Sold
1997 M3/4 -- Sold
1995 M3 -- Sold
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