From what I have read Banjo Bolts and copper washers can be a real pain. I got a remanufactured non OEM caliper and am having trouble getting it to seal.i have probably have steady "work hardened" the copper washers so I will need to replace them and try again. What is your experience with dealing with this problem? My thought is that the square brake line surface has to be spotless and also needs to be torqued down to spec. The mating surface has concentric circles that imprint on the copper washers making the seal when "crushed". I have not totally inspected this reman caliper but some have said its sometimes in bad shape. Also, I suppose that I will need to match up the washers that came with the caliper (advance auto brand)See pics. I welcome suggestions. Thanks