On Wednesday, November 20, 2019 at 6:02:18 PM UTC-8, jbeattie wrote:
On Wednesday, November 20, 2019 at 11:07:59 AM UTC-8, Andrew Chaplin wrote:
I have been riding a gravel bike (Kona Rove NRB DL https://www.konaworld.com/rove_nrb_dl.cfm) for a year now. It has developed a tendency to drag the pads of the front brakes against the disc. I recently had the pads and rotor, front and rear, replaced (about 5,000 Km of use). As I ride, a noise comes from the front brake that suggests that the pads are touching the rotor, and it increases in volume until I "blip" the lever, which makes it go away for maybe another Km or so--or less.

Has anyone encountered this before? if yes, how did you solve it?

Yikes, you must do a lot of braking. 3K miles for a rotor doesn't seem like much.

Anyway, you may just need to reset your pistons. https://www.epicbleedsolutions.com/r...liper-pistons/ If that doesn't work, then the next thing is checking to make sure the caliper is centered. Like Andrew says, just follow the instructions for installation/alignment. https://www.youtube.com/watch?v=uk_nC9anQcM&t=13s

If that doesn't do it, check to make sure that both pistons are retracting. I have a piston that will drag occasionally, and I need to clean it. Follow this routine: https://www.youtube.com/watch?v=vQXF...&feature=youtu

Another outside possibility is that the system is over-filled, so if all else fails, bleed it and refill it.

And if all that doesn't work, buy a new caliper -- you could just have a bad one (there can be issues with seals and pistons). The notion that a hydraulic road disc will inevitably drag and make noise is wrong. I have hydraulic discs on three bikes, and they drag only when there is an issue.

-- Jay Beattie.

Remember that Joerge rides almost entirely off-road. My CX bike wore the pads out very rapidly. But it was my impression that this was because the pads were very shallow. After all, you could slip them in without pulling the mechanism apart.