Shimano 4 piston Bleed Block
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Block for Shimano 4 piston caliper and lever bleed
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A combined bleed block for 4 piston Shimano brakes.
The wide part is the standard Shimano bleed block, without the ears to allow top loading. Use this part to make the quick lever bleed, or before a full bleed.
The narrow part is what was missing. It slots into the caliper from the top and allows you to push the pistons partially out. Safely, no risk to go too far.
This gives better oil flow in the caliper during a gravity bleed, as there's more room behind the pistons.
Printing can be done vertically.
I did mine on the side in PLA with a PETG support interface. Probably a bit overkill, but it looks good for the photos.
2 walls, 10% Cross Hatch infill is enough, the holes give more than enough horizontal strength against the pistons.