Cheers for the replies so far. Much appreciated.
The brakes are getting contaminated(/whatever) at both ends, but not always at the same time – some days its just the front, or just the back, other times both. Sometimes I go for a couple of weeks with no problems then it happens every day.
Setup is fine AFAIK but I’m not an expert on brakes! At least the pads are centred, pistons not overly sticky and I do clean them after muddy wet rides with isoprop (I remove the pads when doing this). Haven’t noticeced and leaks at all from the pistons.
I would say it’s the caliper not being set up correctly myself rather than contamination. I’d say that’s the main reason for brakes problems full stop but certainly in your case.
Have the brake mounts been faced? Has the caliper been aligned when setting up the spacing?
Pad contamination in my opinion and experience, is a complete load of bobbins, just like bedding brakes in is.
Mounts not faced admittedly, but I don’t understand how this would make the brakes go from powerful + really good to really howly and awful performance.
I only use isopropyl alcohol to clean them, no muc-off disc cleaner or anything.
Also, it’s not bobbins :twisted: try putting a dab of chain lube onto your pads.
Now he (or she) will say he rides to work through an oil refinery or something.
He – and no oil refinery, but I do notice the lovely rainbow coloured oil patterns on the road whenever it’s damp out. Don’t think it’d take a wild leap of imagination to see how it could end up on the rotors. :D