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Maybe you have sticky pistons. See if one of the pistons moves less than the other and/or sticks out more. You can clean your pistons by
- removing the pads
- getting the pistons as far out as is comfortable (take care that they’re both extending by an equal amount; that will not happen by itself if one is sticky; in which case you can block the one that’s getting out more until the other one catches up)
- cleaning the sides of the pistons with cotton earbuds and generous amounts of acetone (that’s what I use, maybe someone will suggest something better)
Then push the pistons back in and put back the pads and wheel.
- removing the pads
cgg-
cleaning the sides of the pistons with cotton earbuds and generous amounts of acetone (that’s what I use, maybe someone will suggest something better)
After cleaning I'd dab the sides of the piston in a small amount of whatever brake fluid the brake uses.
Push the pistons in as far as they will go before and after this procedure. Wipe up any fluid the piston displaces.
If you pop one out...you'll ruin your day :) If in doubt, use a bleed block.
Howard
My front rotor keeps on rubbing. Couldn't fix it by loosening the bolts and retightening but the rotor was not true anymore so replaced that. The brake pads were almost gone, so replaced that. Did the retightening again and everything was fine. Up until I have to brake hard/am climbing. Then it's back to the rubbing. Sometimes it stops rubbing during the ride, if not I adjust it at home but it's getting on my nerves. The brakes are BR-RS785. This is about where my knowledge about disc brakes end. Do I need to do something with the pistons? Do I need to bleed them?