can someone explain why AMG is using a different braking setup for the S and CL AMGs from the lesser E, CLS, CLK, SLK AMG models. Instead of using 6 or 8piston front calipars and 4 pistion rears, the S and CL AMGs use twin sliding calipers at the front and only a single piston sliding caliper at the rear. What are the advantages and the disadvantages of each system?