I have lubed the pistons by taking off the brake pads and pumping the lever to pull out the pistons as much as possible then dropping brake fluid around the pistons. Right away this seemed to fix the problem but after one run at d-ville the return of the lever got slow again. Braking performance is still good but this is not normal.
Mtbr's 2016 Winter Biking GearReviews and Roundups
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