Is anyone farmiliar with hope mini brakes? Basically my friend's front caliper seizes when he presses the brake, it came to a point where we had to take it off completely just to continue riding.
I took it home and took the pads out and pressed the brake so the pistons came out a bit then I cleaned it with brake cleaner but then I couldnt push the pistons back! It was like break the screwdriver tight! Anyway I managed to reset them by unscrewing the nipple so I could push them back. I rang specialized and they said the pistons were corroded and I should buy a new caliper!

The brakes were pretty expensive so I was thinking we just take them apart completey and clean them up??
Has anyone overhauled a hydraulic brake?