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I've used SRAM DOT grease on Hope pistons. I think any DOT grease should be fine. But I doubt that a sticky piston would cause you that much trouble. If you take the wheel out then there's enough room to walk the pistons all the way out. then you can take a good look and work out if it's really that or a different issue.
chiroshi
I'm having troubles with one of my Hope E4 calipers. During my last ride, the front caliper seized up and after pushing the pistons back on the trail I was able to limp home with out a front brake. I cleaned the pistons and lubed them with some silicone lube. Hope recommends some hunter lube which I can't get in Germany at the moment, so I used liqui moly silicone lube. However, the pistons still don't fully return. Any idea what's going on?