Driver rear brake hose leaking. It seems to be leaking thru the threads where the hose screws into the caliper. I slid the caliper off and it's clearly leaking with foot on the brake. There is a slight leak even when no pressure is applied to the brake pedal. The hose itself shows no leaking, rather thru the threads.

I unscrewed the hose off the caliper and inspected the threads. I put in a used caliper and tightened the hose to it. I noticed there is no washer at the bottom of the brake hose going into the caliper, though there is room for one

I would just go with another brake hose if I could get the old one off at the brake line fitting, but I can't.

Am I to conclude that the threads on the decades old hose have failed? Could I use Teflon tape on the threads? What about the absence of a washer?

Please offer your help
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89 240 wagon, 94 940, 300K, 94 940, 141K