Alright so I've just completed building up my road bike. All components are sram rival (don't know if that helps determine what's wrong but it may) and I only have one issue. After I apply pressure to the brake/shifter lever, the brakes respond and grasp the rims, but when I let go of the lever, the calipers don't release. I have to take my hands to them and forcefully pull them apart. Is there a quick fix to this? I really don't know what the issue is, to my knowledge they're set up correctly. Any help greatly appreciated.