So apparently Da 'promised' FF to go biking with her after church. Even though it was a bit cold and there was still snow in some areas, they went biking to Adventure Park anyways. Five minutes after leaving the house, FF was complaining that she's tired from running 5K Girls on the Run in the morning which they ran for about 3.5 miles. But Da gave her grief about dragging him out and she wants to go home so she continued biking to the park. She stopped several times on the way, especially going up hill. It took us about an hour to bike there. While FF was running around the park, Da looked at FF's bike to check out the brakes. So it appears that one of the springs on her front brake came loose so it was not off-setting the other side spring, which means the whole time FF was biking, the brakes were pressed on the wheel. After it was fixed, she says the bike rode so smooth and didn't stop on the way home.
( Oh well, next time we should thoroughly check the bike before setting out to bike.)