make sure you push the pin in before you put any opening force on the clamp. It seems to work better that way. Even a little opening force on the clamp before pushing in the pin seems to lock it up for me
I discovered something regarding this while working on my wife's bike. There is a small plastic insert/washer that holes the release pin in place. Someone, on one side of her bike, the plastic insert has fallen off. Once that is off you can simply remove the release pin and tiny spring behind it. It simply causes interferance for the lever clamp hinge. When pushed in, it's out of the way allowing the lever hinge to pivot.
I searched online quite a bit and didn't see any replacement parts for this. So I used a small pick and removed the other side too. Came out easily with no damage to brake body. Now, no more push to release.....
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