I collected a few sets of rears at PnP from w126 and w124 but only got one side 
off a w123.  All were the same massive PITA to remove the bolts.  Needed a MUCH 
bigger breaker bar.  The rears I pulled were all ATE and the same no matter 
which model.  The SDL and SD wanted fresh rear brakes, so I rebuilt the units 
myself.  The SDL needed fresh lines and hoses all around.  I installed the 
lines and calipers my own self and had the shop do the ABS pump and bleed the 
system for massive labor savings.

Just my $0.02 experience of compatibility.  I think the W114/115, w116 and R107 
also use the same rear calipers

clay


> On Mar 2, 2020, at 1:41 PM, Dan Penoff via Mercedes <[email protected]> 
> wrote:
> 
> Someone asked me this over the weekend. They heard that W126 calipers and 
> rotors were a bolt-up to a W123.
> 
> Never heard this. True? No?
> 
> -D

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