Alright guys, I need your help. I took the front driver's side caliper off my 76' 300D to do some routine cleaning, when I put it back on and bled the brakes, the brake light came on and never went back off. I believe I have found the problem to be the caliper is leaking brake fluid. Ok, hear is what I know, the caliper is a dual piston Ate 64Rm. The caliper comes off in two pieces, There are two very small seals inside the caliper where the two pieces join together, these are leaking. So far I can't find the seals anywhere, Auto Zone, Napa, and yes Mercedes. Has anyone else had this problem? Can anyone give me some advice? Any help would shure be appreciated! I also know that I can buy a whole new caliper from Auto Zone for $59.00.
Thank You

partner. you are making it too difficult. the calipers should not be split unless leaking. they come off as a unit. personally i wouldnt remove a caliper to clean anything unless i needed to change a rotor or actually replace or rebuild the caliper. kits for the o rings you need are available for cheap. or you can use the rebuilt units you mention although i cant speak for them.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Did you separate the two halves of the caliper? If it is an ATE, you're really not supposed to. Even when replacing the piston seals, you don't need to separate the halves.
If that is indeed what you did, you probably wont find those seals anywhere.

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6

Thanks guys, indeed I did split the two halves open.Tom you said I could get the o-ring set, where could I find it? You guys can believe me this will be the last time I ever take the caliper off in two parts.
Scott

that such parts are available from the usual sources of mb parts. brian carlton has split them i think. maybe try pm to him

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Good luck with the seals. If you do find them, you might need to check with ATE about the torque specs for the halves. In the manual, it says not to separate the halves because they are torqued unequally at the factory.

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63 220S W111
76 300D W115
2013 VW JSW TDI M6

previously-
73 280 SEL 4.5
86 300E 5 speed
2010 VW Jetta TDI M6

I agree with autozen. The autoparts business has gane the way of Wally world, cheap offshore parts that don't last. Sure they offer a lifetime warranty, so what? You get what you pay for. Parts sold by any of the McParts are very poor quality. I would disagree about NAPA. The problem is that NAPA is great for vehicles/equipment made in the U.S.A. not European imports. NAPA just reboxes parts for imports. These can solmetimes be poor quality as well. All hydraulic brake parts have a finite shelf life. The mc from McParts could be several years old. I would try to find a new ATE brand master. There is no experience like stepping on the brakes and having the pedal go to the floor. A W115 250 has a common Mercedes mc, shouldn't be too hard to find. The dealer may surprise you. The price for a new MB master cyl may not be much higher than a reman from autozone.

Good luck, bro.

Thank you guys for all of your help! Unfortunatly both the calliper I bought and thye MC was from a "McParts." Shure enough when I got the caliper it was broken and they had to order me another one. lol After working on the brakes for a month and never having this much truoble in all my life, I finally decided to take the car into the shop and let them take care of it. I appreciate all the advice everyone has given me, and next time I will strongly consider getting parts from Mercedes. I just assumed, since the "McParts" caliper also an Ate, it wouldn't be any different than an Ate caliper from Mercedes. Just like the old saying, we all know what happens when you assume...... lol
Thanks Again!!