In case you were wondering about what lives inside the indirect piston. This is what makes the e brake work.
Mine didn't and it was due to the circlip marked "was loose" coming out of it's groove.
There is also an O ring seal in the back of the indirect piston around the e brake actuating plunger that is exposed to brake system operating pressures. It seals on the shiny surface of the part just above the holes of the "was loose" circlip. The O ring (not shown) that seals it lives in a groove machined into the indirect piston.
It's a bit tricky to get at and you'll have to match one up at the parts counter as I've not seen it included in the rebuild kits.
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