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Two weeks ago I had an issue about my brakes QR not working and asked about on this site Road rim bike brakes don't open when using the release

I got some help - and I am very thankful for that - pointing at replacing my cables. I did so and cleaned the brakes in the process. I followed the Park Tools book for that. During the first ride the rear brake opened, and since then I have not been able to close it. See this video https://i.imgur.com/RouHYPP.mp4

It looks like the mechanism which is supposed to maintain the brake closed has gone too soft.

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    There is something wrong with the "lock device". It should be grabbing onto the mating surface to hold things closed. Jul 24 at 0:40
  • @daniel is it something that can be inspected or fixed? Jul 24 at 5:54
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    It requires inspection by a perceptive mechanic. Jul 24 at 11:56

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