Shimano M485 piston un-stucker
thingiverse
My Shimano M485 had one of its pistons stuck, causing a brake pad to wear out rapidly. I prevented the other piston from moving by using this tool and applying pressure to the jammed one. It took minimal effort to dislodge it, but further work is needed for smooth operation. On my M485, the pistons are not centered within the brake pads, leaving a slightly wider space for the piston. Fortunately, the supports held firm during use. I may design an improved version in the future and mirror its structure. I printed this tool at 50% cubic infill and four layers, but a denser print of 100% might provide additional stability. This solution likely applies to Shimano or Tektro brakes using B01S-sized brake pads.
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