Aren't W124 rear calipers fixed two piston calipers just like the W114, W115, R107, and W123's?

Pop the pins, remove the spring holder, push back the pistons, then remove the old. Assembly, as they say, is the reverse.

No need to pull the caliper off the car, unless you are replacing the rotor. Caliper is held on by two bolts, 17 or 19mm. rotor is held on by allen head bolt.

If you are in a wet/salty enviormant, be prepared to whack that rotor to break it off the hub....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles