I fitted a new front bt016 to the yam, and while I had the wheel out finally remembered to fit a decent 90 degree valve, As its finished winter commuting duties now, im changing or sorting corroded bolts etc as I go. the front axle pinch bolt was a simple swap for a stainless one, whilst I cleaned up the caliper bolts with a wire wheel, then done the old heat/oil thingy to rustproof and black them. Cleaning up the caliper, I found three winters have really taken their toll, despite regular maintenavce. One of the pistons was so tight, the pin the pads slide on was actually bent. I know from experience that no amount f brake cleaner/toothbrushing is gonna sort the problem; corrosion in the piston seal groove is pushing the buggers out, and they need stripping, cleaning and new seals.
So...ive never done blue spots before. Im assuming I gotta get a tool to unscrew the plug and the pistons pull out of the hole. what im not sure of is how this affects the piston seals when you re-assemble..ie normally you have the lip to the inside of the caliper..but how do I push the pistons back in from behind without damaging them if thats the case? Also, is Fowlers and genuine seals the way forward, or are the fleabay ones ok? all help much appreciated fellers....