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Yes the 400E units are larger and provide more clamping power, a very good choice for the rear of the W124 6 cyl.
I did intend upon installing a brake bias adjuster, it was something I picked up right around the time I was doing the brakes, but low and behold, after installing the 400E brake setup and getting them seated correctly, ABS testing proved that I did not need to mess with the proportioning. The front ABS kicks in just a little before the rears, right where it needs to be. So I sold the brake bias adjuster.
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