Brake callipers rear. Cannot find the right ones




I agree that it is sad that the vendors don't know what they are selling, but things are a little more complex than that. For example, early on, I found a 2002 S500 in the pull-a-part yard with good-looking rear calipers and rotors. I noticed that the rotors were thick ventilated versions, and that calipers were much larger than those on my 2003 S430. Great - I bought calipers, rotors, pad, brackets, hoses, etc. for very little money, and upgraded the brakes on my car. A little research showed that the brakes changed in October of 2002, and that the only way to know which you had was to use the VIN or a direct comparison. Model and year didn't help at all.
I have had the same problem that you did - overheating rear brakes - on both of the W220's that I have had. The boots and seals are really all that you usually need to rebuild the calipers (plus the proper brake grease). The pistons were very high quality, still looking like new, and I have seen no damage or corrosion on any of the calipers that I have repaired, nor have the bores been damaged enough to worry about. You can buy the seal and boot kits from many different sources, but given the obvious safety issues with quality of rubber, fit, etc., I think that buying from Mercedes (not Amazon or eBay) is well worthwhile.
Everything in life involves trade-offs, and few things more than brake pads and tires. The better brands of pads and better vendors usually show photos or drawing of the pads, so you can get ones that fit. Then you just have to balance the trade-offs among stopping ability/pad life/dust production/noise/cost/rotor wear, etc., etc.


