I didn't see this posted in the thread thus far, so here you go.

http://catalog.worldpac.com/mercedesshop/sophio/quote.jsp?clientid=catalog.mercedesshop&cookieid=2CB0VK7FH2CJ11T8R4&baseurl=http://catalog.peachparts.com/&partner=mercedesshop&year=1979&product=N1050-70213&application=000403568

thats the link to the rebuild kit from Fastlane.

rebuilding the calipers is easy. I used a air compressor to eject the pistons. changed the seals and used a pair of channel lock pliers to reinstall the pistons. very easy and strait forward.

using the air compressor is kinda scary the first time. i took a piece of scrap plywood and stuck it between the pistons. and then put another piece of plywood over the whole so that the pistons didn't fly across the shop. then used the air blower nozzle with the rubber tip and stuck that in the port for the brake line. they pop out with a loud bang. keep your fingers out of the way. once they are out clean them with break fluid. clean the caliper with brake parts cleaner and a small wire brush. then clean it with brake fluid. install the rubber square cut seal into the bore in the caliper, and then coat that with brake fluid. then install the piston. using break fluid as lube. only use break fluid, other lubes will not react well with break fluid later on. installing the pistons will be tight. this is where the channel locks come into play. once the piston cups are back in then attach the rubber dust covers, and then the heat shields. it takes about an hour to rebuild both calipers. maybe 2 if you really take your time, which is a good idea on the first time thought. i found it very worth wile. 13 for the kit and i bought calipers from the junk yard for 12.99 each. so 25ish a caliper and then another 10 bucks for brake fluid and brake parts cleaner. you have a new set of calipers for 60 bucks. not bad.

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