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I have bought trike take off parts for future use and I was wondering what would be the best method of storing a rear caliper that has previously had brake fluid in it. Should it be stored filled or empty. If empty, how do you clean it first so it doesn't rust.
Any thoughts?
 

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I'd fill with brake fluid and seal as best I could to keep rust out of the bore and off the pistons. Spray lith or other grease on the outside and store in a freezer bag till needed.
 
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Only thing I'd do in addition to above is push pistons back all the way into the caliper.
 

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I would clean the exterior of the pistons, coat them with a light coat of silicone grease. Then push then all the way in and fill the caliper with fresh DOT4 fluid and plug the banjo bolt hole with a plastic plug. You can get the proper plugs from any hydraulics shop.
 
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