Hope mini disc brake lost all braking force!

Rear is fine but my front has no braking force left. These are about 10years old now and have served me well.
Is it worth trying to fix or buy a new front brake? Can't see anywhere that fluid has come out apart from the brake lever is a bit mucky.
Is it worth trying to fix or buy a new front brake? Can't see anywhere that fluid has come out apart from the brake lever is a bit mucky.
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