I'm not sure which is better, I believe all four of mine are Bendix. You can upgrade to the 560SEL calipers if you wish to do so, I don't recall how much work it is getting it to fit but OmegaBenz (Austin) did it.

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Jeff M.
Mercedes W123 DIY pages are now located here.
1983 / 1984 300D Sold
2000 CLK430 Cabriolet ~58k Sold
2005 Avalanche 4x4 ~66k