Joined: Jul 2015
Posts: 7,344
Likes: 3,206
From: NW Oregon
Bikes: 1982 Trek 930R Custom, '91 Diamondback Ascent w/ XT, XTR updates, Fuji Team Pro CF road flyer, Specialized Sirrus Gravel Convert, '09 Comencal Meta 5.5 XC, '02 Marin MBX500, '84 Gitane Criterium bike
clean, sand, and clean the discs ...then slide some fresh pads in... i bet they're contaminated.
Amazone search: Alligator Turbo Disc Brake Pads Fit Tektro HD-R510/R310, MD-C510(Only Alligator Turbo Disc Brake Pad),2 pack, AR2437
just type in your brake brand and model number, and dozens of others pop up... go with orgainic pads for best braking, and semi-metallic for more longevity... EBC, koolstop and swiss stop brands are quite popular... and stock tektros work well too.
i've seen way too many posts on here of folks that just try to clean up old pads... they end up buying new ones anyway.