Interestingly the rear brakes on my BMW K1600GT motorcycle also last half the time of the front brakes. On these bikes, you apply the front brakes and the computer applies the rear accordingly based on load, deceleration etc. You can also apply the rear brakes by foot if you need to but whenever I do that they are already at the optimum, so no point. This system has been on my last three bikes and I love it but it does create more wear in the rear brakes with my kind of commuter type riding with little heavy braking. Lots of heavy braking would wear the fronts a lot more and I think it would probably be the same on the D4.
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