I just finished brakes, and I recognize these as Ate (obviously rear). i rebuilt my two front Ate calipers using rebuild kits from ********....about $18 apiece....very easy. I just pried the piston out with a screwdriver, everything else is self explanatory.

good luck,

Mark

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1984 300TD Wagon, 407,800 mi (current daily driver)
1985 300DT Sedan, 330,000 mi (gone to that great autobahn in the sky)