my view on 400E rear brakes. The caliper is the same as 300E ones except there is a spacer inbetween them to allow for the extra thickness of the vented rotor. The vented rotor is good, but having to mess with the dust shield isnt worth the upgrade, when you can go to 500E or SL500 or Sl600 brakes, which all of these 400e/500E and the SL R129 all have the same rear dust sheild. For your 190E if you like cutting dust sheilds, I would say that would make you have plenty of brakes...My friend has a set of 400E rear brakes if someone is interested, I could even take the dust sheild off too.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.