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@Veblen
Because I'm an idiot who does everything last minute, I had the displeasure of finding out that both my hydraulic brakes were completely ineffective on the start day for PBP.
This was after the bike had been left on my home trainer for ~2 months. The brakes were squealing if I squeezed the levers to hard, and could only slow me down, at best. The rear brake started functioning almost properly again after ~20 km, but the front brake only got slightly better over the course of PBP, and is still squealing.
This is the second time this happens, on different bikes (first bike had GRX Di2, this one has 105 levers with a mix of calipers, 105 in the front, BR-RS785 in the back) in different apartments. I was running resin pads both times though. I don't think it's a bleeding issue, as the levers still feel relatively stiff.
1°) Does anyone have any idea why this happens?
2°) Is there any way to fix it now without changing the rotors and the pads?
3°) How can I fix it before going on a ride? Or how can I make sure it doesn't happen when I take the bike of the trainer before putting the wheel back in (e.g. clean the rotor with isopropyl alcohol maybe?)?