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There are different types of triggers for iDrive warnings.
The state inspection and the brake fluid are simple date reminders. The vehicle doesn't know the work was done. When you complete the work, you just reset the date for another year or two years. If the tech didn't do it, you can do it.
There are condition-based warnings, such as oil service. Those depend on driving history, oil condition, etc.
The brake pad warning is a combination. There are two trigger points in the pads for both front and rear, one at midlife and one just prior to wear out. In between those trigger points, the vehicle calculates likely pad depth remaining but it isn't particularly accurate, so when a hard trigger point is reached it corrects the readout. That is what causes a jump, showing as reduced pad life remaining. A physical inspection will confirm the actual pad life remaining. My service advisor does it with a hand held tool in the drive-through bay, reaching through the wheel. It takes about 15 seconds.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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