• Are the E4s new? If so the pistons tend to be sticky and don't retract properly. I tend to avoid all the time consuming piston training Hope talk about and just ride them for a while. During use everything settles down and the pistons retract consistently

  • I've taken it for a spin and all is fine on that caliper, but the other one is touching on one side now. They're not new, maybe they just need disassembling and cleaning.

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