Brake fluid leak between front caliper and hose mk3

Dear members

I just rebuilt my front Lockheed brake caliper with new pistons and seals. After putting it back on the bike I now have a leak between the caliper and the hydraulic pipe. Do you ever had this problem? Any solutions? Just more force to tighten the nut or maybe some tread sealant?

Thanks for your answers.

Marcel

No thread sealant, that is for pipe threads. Start by removing the fitting, inspect both sides CLOSELY. Look for nicks in the seat, foreign material. Clean the threads well, all the way down.