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Well, there was no fluid in the master cylinder, so we topped that up and the brakes worked again. However when I taxied back to my hanger I discovered a line of fluid on the floor under the caliper location and sticky residue on the bottom of the caliper, so looks like the caliper seal needs to be replaced. They are working on it today. I think I managed to produce the fluid on the floor by sitting in the plane and pumping the brakes last weekend. I think its a pretty slow leak so no residue was there when I looked previously. I always look on the floor when doing a preflight for brake fluid so I'm sure it wasn't there before. Lesson being a slow enough leak at the caliper may not produce obvious leakage reside, as no braking is usually done in the hanger, but since the master cylinder reserve volume is pretty tiny, over time you can blow the fluid out and get no brakes.
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