Well I spent a lovely few hours up to me ear oles in 20 odd year old brake calliper grime today. Out of the 8 pistons on the 2 calipers 5 were seized solid and the other 3 were sticking. Took me almost an hour to remove one of the caliper pins. However patience and brake cleaner won and now iv 8 working pistons and lovely responsive brakes. The shakeing head is 80% better but can't say I trust the bike completely yet. I'm almost certain new tyres will remedy the other 20%.