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The minimum service spec on your rear rotors I believe is 13.5 mm, at least it is on the 320. If you are above the service spec you can just replace the pads, bed them in and you are good to go.
The distance remaining when you hit the pad sensors is a subjective thing, depends on if it is city or highway driving or both. It is not a "pull over and stop" warning, I would say usually closer to a few thousand miles rather than a few hundred, but again it will vary. You are "supposed" to make an appointment to get it looked at when the warning comes on.
On the cluster, you remove the 2 panels on each side of the steering column, then the piece between the top of the steering column and cluster. Next you will see a tab underneath the cluster bezel, pull out on the tabs and down on the cluster bezel and the bezel will come off, sliding downwards. You will then see a screw on each side of the cluster, and a pair of plastic fasteners at the top, one on each side of center. Remove all these and the cluster will come out.
I haven't had a problem with the climate control lights on the ML yet, not sure right now to tell you how to do this.
Gilly
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