Quote:
Originally Posted by woodrat
On my 123 anyway, the brakes are split front and rear. The rearmost chamber in the MC reservoir is for the fronts, and the front most part of the reservoir is for the rear brakes. There is a wall that separates the chambers in the reservoir, and you have to fill the front chamber up to the top to get the fluid to flow over the top of the separator into the rear chamber. At least on this car, you could get away with changing out either fronts or rears and not needing to bleed the others if you were careful with the fluid.
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I guess I have seen it both ways, diagonal and front/rear...not sure which system Mercedes used but if your W123 is that way then his probably is too in which case you would not have to bleed the rears if you didn't open that circuit.