BOTM Winner 03/13
Join Date: Apr 2010
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It looks as though the hoses are just loose at the joins. Are the clamps tight? It might just be a case of tightening up the clamps with a screwdriver?
If the hoses are old and perished, or have stretched over time to the point where they can't be used to form a proper seal, then you might need to replace them. If you're saying that you can't notice any deterioration in the hose and they've not been remove/refitted or otherwise played with over the years then I'd find it odd that you're having problems like this.
It could be that something has made a very small puncture in the hose when you dropped the bike and you just can't see it. That, again, would be a hose replacement job.