Bicycle disc caliper piston spreader

Wedge to press disc brake caliper pistons back into the caliper body during service. Print two, use them in a pair. Insert from opposite sides of the caliper, push them together, then use the finger holes to remove them. Quick and easy, easier than using a tire lever.

Two widths - standard 26mm and narrow 19mm. Standard fits anything from Shimano road/MTB 2 piston calipers that take K/L pads up to four piston brakes. If you only use 4 piston brakes, scale it up in the Z direction to the width you need. Narrow 19mm fits calipers that don't load pads from the top, such as the lower end Shimano calipers that take the B pads, or Magura's 4 piston calipers with split openings and individual pads for each piston.

Also available on my Etsy store.

Print instructions

Print two! This might work on its own but it will work far, far better as a matching pair.

Print on the side (should load in the proper orientation) so both surfaces of the wedge have a consistent, smooth finish. Layer height, shells, infill, all can be pretty much whatever you want as these don't need particularly high strength.