I'm struggling to diagnose and repair a leak right where the brake line feeds into the caliper.
I've replaced the copper washers, the banjo bolt, and even the caliper itself, all to no avail. I'm confident that I'm torquing the banjo bolt enough because I can see the grooves imprinted in the copper washers when I remove them.
Here are some photos to illustrate:
Given that I've replaced everything except the brake line and yet the leak still persists, I'm beginning to think that the problem is perhaps caused by the brake line. But I can't see how. The mating surfaces look smooth to me.
- Should I try somehow sanding down the brake line's mating surfaces?
- Should I just go ahead and replace the brake line?
- Is there something else I should check or double check to identify the cause of this leak?