The problem could be due to a tiny scar, pit or other similar problem on the sealing surface. All it takes to cause a leak is a tiny surface defect and the crush washer will not seal.
Check all sealing surfaces very carefully. If there are any problems with the sealing surfaces, do what is needed to fix this first. This could mean replacing or a little machine work on what ever is required to get a proper flat smooth sealing surface.
Use new copper/aluminum crush sealing washers or anneal the old copper ones if they are to be re-used. Do not over torque the banjo fittings or they can leak and cause other problems.
One possible solution is to use a O-ring in a washer type of banjo fitting seal. These are available from your local industrial fitting supplier or Mc Master Carr p/n 93786A200. The clutch banjo fittings size is M12.
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