My back brake (top picture) is clamped down, as it should be. The quick release on the front won't stay down. I have tried loosening the cables, tightening them, nothing works. As you can see in the gif at the bottom, it keeps springing back.
I've decided enough is enough. I braked hard while going down a hill and the front brake just pinged open. Not good. I didn't get hurt, but it's only a matter of time.
Why is this? What can I do? just get a new front mech?