Ok, 6 years, 45k mi. You had a good run with them. Personally I'd do a full brake job, rebuild the calipers, new rotors, new pads, new flexible lines, get it all good a new and not have to worry about it for another 6y/45kmi. I don't know about you but I may not even live that long! On that line, the extra $1-2k will just come out of your kid's inheritance! Focus on what is most important!