I took my 2nd Tesla MS delivery today. 100D AP2.5 after I had 85D for 3 years. After I took the delivery, I noticed that there was only one brake caliper on the rear wheel. My last MS85D had 2 calipers so as a friend of mine who took 100D in past has a 2nd caliper on the rear wheel. Is it a new "downgrade feature" that Tesla does not inform to customers or the single caliper does the job better or equal than one before? I really loved the look of 2 calipers and I am a bit disappointed to see one. I understand that a second caliper was used for a parking brake or some sort? If anyone knows anything about it, please let me know. thanks! ps, Tesla's new 'graphite interior liner' looks fantastic!!