How are the rear calipers secured on the 124 chassis cars? I need to do a brake job, on my car where it sits in my apartment parking lot. I have tools but i need to get them from my roll around before i start the job (roll around is 50 miles away). So i would like to know what tools are needed to pull the calipers?

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

or can we shimmy the rotor out of the way without taking them off?

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

17mm or 16mm socket (possibly 19mm) , ratchet, 5mm allen. Hammer, and brake pin punch.

assuming wheels are off.

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Current Stable:
1994 S500 v140, 210k miles, white with grey.

Former Mercedes in the Stable:
1983 300CD Turbo diesel 515k mi sold (rumor has it, that it has 750k miles on it now)
1984 300CD Turbo Diesel 150 k mi sold
1982 300D Turbo Diesel 225 sold
1987 300D Turbo Diesel 255k mi sold
1988 300 CE AMG Hammer 15k mi sold
1986 "300E" Amg Hammer 88k mi sold (it was really a 200, not even an E (124.020)
1992 500E 156k mi sold
etc.

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

Yeah, the previous owner pretty much ran the car into the ground, so the brakes are sooo bad I'm not even driving it right now. I had the rear tire off for a few seconds to see what was wrong and holy crap they are shot, they got so hot that it looks like the rotor material melted and flowed out away from the pad. And i use the term pad fairly loosely as it is more like a 1/8" thickness of the backing plate that is left. Where are the allen heads that hold the rotor on? I only ask because I didn't see anything of the like when i had the wheel off. It is in fact a two opposed piston caliper on the 124's.

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.

If the brakes got that hot, the chances are the bearing grease is gone too. You are heading into a job that is likely to expand in scope dramatically. The bearing access is not easy and if the bearings need to be replaced this is a job that will require some special tools and skill. If you are unfamiliar you will need a manual - you can search here for information as well, and if you get stuck there are a few guys here who are first class mechanics, who have been known to help a guy out. I would take it to a shop with known MB, and W124 specifically, know how.

The rear brake assembly is complicated by the emergency brake, which is a small drum brake built into the hub of the disc assembly. They can be nasty to get off by themselves. Lots of banging with a hammer, once the fasteners are out. So, plan on rebuilding the emergency brake while you are in there.

Most of the brake is pretty straight forward. Removing it is obvious and I believe it is a couple of 17mm or 19mm bolts that hold the caliper on the wheel hub/axle. Be patient. Sounds like the brakes are frozen, and have been pretty seriously overheated. Rubber seals don't deal with such heat well and you may be rebuilding the calipers or just be replacing them.

Good luck, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)