Re: Disc brake Banjo bolt. How to seal??
Notice the banjo has little ridges on both sides - sealing ridges.
The washers have to have compatible ridges so they fit together snug. The hole in the washer has very little clearance to keep them concentric.
You may have the wrong washers.
When you hold a washer up to the banjo you can feel if snap right in (right) or slide around on it (wrong.)
You should get a very tight fit with almost no leaks just finger tight, not gorilla tight. Then torquing it down just makes sure it stays tight.
Check the imprint on your washers.
No sealants, a sealant will get inside on the square O rings, causing major problems.
After it's sealed, stab the pedal hard, then let up. Both sides should have equal drag on the rotor (the stabbing gets everything lined up.)
If still unequal, find out why, else you'll have a pull and burn up the tight side.