So how does the unit in the vehicle "know" the brakes are being applied? I would think that the unit would still need the "brake applied" signal. When it sees the signal, then the level of braking as selected from the unit in the vehicle is applied. Does anyone have this actually installed in an E53 X? Thanks.

When I get the X5 back, I'll test the pins to see if the "brake" signal is actually generated on the OE pinout. I doubt it is and I'll need to tie it in.

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Daily Drivers:
- 2008 535i, 320,000km
- 2004 X5 4.4, 01/2004 production, 420,000km
- 1997 328i, 350,000km

Track:
- 1996 328i, track/race car, ~300,000km

Winter:
- 2013 Ski-Doo MXZ X 800 E-TEC, trail can
- 2007 Ski-Doo MXZ Blizzard 800 HO
- 2001 Ski-Doo MXZ 600 w/800 engine, exhaust
- 1978 Ski-Doo Olympique 340 (vintage race sled)
- 1977 Ski-Doo Olympique 340E