Hi, I have a 2014 F56 MCS and I took the wheels off yesterday to check brake pads. I have a few questions below.
1. In the first picture, am I measuring the right place to get brake pad thickness? Looks like the rear pads are thinner than the front pads.
2. What thickness will trigger the brake sensor? 3mm?
3. There are two lines in the second picture (front right brake).. The right one is the brake line. What is the one on the left?
4. According to the third picture, seems like there is no brake sensor on the front? From all those youtube videos I see, if there is a brake sensor, it should go right through the caliper?

 

Both wheels will have a brake line, and an ABS sensor.
Only one wheel will have a pad wear sensor.