I got new brake pads for my avid mechs. and the rear ones are avid brand, they're fine. it's the aztecs in the front that are givin me the crap. They didn't come with one of those little metal paperclip like things to keep them sprung to the outside of the caliper. after the first time i brake, the one side rubs constantly, and the old paperclip like thing wont fit the new pads.