Having a real headache with the old Shimano Deore disc brakes on my singlespeed. I've always serviced them myself and they've been completely reliable for years but started playing up over the last couple of weeks - eventually fading completely on my ride home from work last Thursday on a long and steep road descent (V scary).
Since then I've flushed through with new mineral oil and bled them, thoroughly cleaned the rotors and swapped out the pads but they're still not behaving. They howl like a banshee - particularly when wet - and either don't engage or judder horribly.
My first thought was the seals had gone but there is no seepage that I can see and no signs of the pads being contaminated. The pads aren't glazed and I've done all the normal stuff to get them to bed in.
I fear they've just reached the end of life but the budget can't stretch to a replacement set so looking for top tips to sort them out.