I have Shimano RS505 brakes/shifters on my road bike (with 105 shifting kit, because that was the only way to get 105 and hydro brakes in 2016). I've not ridden it much for a couple of years, but finally got myself healed enough to start riding more this year. The front brake was alarmingly noisy this morning, and I had some pads (I'd not done any maintenance on them in ages, so it was on the list), so I figured I'd just pop in the new pads and see if that fixed everything.
When I took the pads out, I couldn't get one of the pistons to move back in. Every time I pushed it (really hard) there was a sort of grinding noise, but no movement. Eventually, I figured I could push it out a bit further and clean it, but it made no difference. So I pushed it it a bit too far and leaked oil out of the seal over the floor (ooops). Still it grinds and won't go back in.
I could just hand it to a bike shop, but I don't want to be without the bike as it doubles as my turbo bike - am I daft for thinking I can take the calliper apart and rebuild it? I've done a course on hydro brakes, but that was ages ago.
Has anyone done this successfully? I think I'll give it a go - if I screw it up then I can always just buy a new calliper (or take it to a bik shop for them to go down the new calliper route).
