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  #1  
Old 10-30-2007, 11:30 AM
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W124 Rear Calipers

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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Old 10-30-2007, 11:44 AM
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or can we shimmy the rotor out of the way without taking them off?
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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.
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  #3  
Old 10-31-2007, 04:28 AM
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17mm or 16mm socket (possibly 19mm) , ratchet, 5mm allen. Hammer, and brake pin punch.

assuming wheels are off.
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Old 10-31-2007, 07:56 AM
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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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Old 10-31-2007, 08:50 AM
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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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  #6  
Old 10-31-2007, 10:09 AM
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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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