OK have noticed recently that I have had and issue with the front brake being a bit squishy, so am going up the the local stealers to get a master cylinder repair kit. Have tired bleeding, bleeding again and reverse bleeding, pushing the calipers in and pumping up the pressure again works for an hour or so.
have replaced one in the CX500 and it's a fiddly job, but as I have braided lines and HH pads and know it used to be rock hard when bike was newer, I'm thinking it need an overhaul.
maybe worth trying that also.
£20 for the kit and an hour to sort
or £60 for braided hoses?
though I'd buy the braided hoses again as they did make a difference for the feel, but unless there's any visible damage or bulges I'd doubt that it'd be an issue in 2 years.
I know I use the brakes allot, maybe not heavy but allot of stop start riding, so much break lever action so I think my master cyl seals have worn a bit, had my bike 2 years, and I'm the only one who's put any miles on the bike.
you can buy the pre made kits off the interweb. I have Goodridge ones I got off a member on here. good quality, but they are a little on the skimpy side length wise, I'd ask for the 1" longer ones for standard set up bars if I bought them again.
I strip the brakes every 3 months- complete caliper strip and clean and fresh fluid. but I'm doing 15k a year, ride every day and don't have a car, so the bike goes every where and never gets washed.