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My Duetto has been without a brake booster form its birth. But I've collected the brackets and a used one in good condition. I've been overhauling it without much trouble except for the hydraulic segment, shown in the photo.

Is there an obvious (easy) way to remove the brass end plug, and presumably the contents behind it? That's #12 in the exploded parts diagram.

Same question for what appears to be a rubber part #11 in the side port.

Thanks,

Robert
 

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This is a bit of a reach as it's been several years (probably 10) since I disassembled that part but I think the brass piece will slide out of the bore from the force of the internal spring. Have you tried tapping on the brass piece with a soft drift to loosen it? That is, compress the spring and release it abruptly, using the internal spring to work that brass "piston" out of the aluminum bore. Another possibility is the careful use of compressed air.
 
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