QUOTE(DRPHIL914 @ Feb 22 2022, 08:56 AM)
@PatMc Thanks for your response, i think you are correct about the o-ring seal not being seated and probably happened during adjustment, and also what i had done was turned it counter CW and drawn the piston out, but once i realized this , once the new pads were placed in i was able to get the venting set correctly and lock it into place, some pressure on the pedal and a short drive and right now no leaking, so it may be reseated, but will watch this closely. My only question is, can that o-ring be replaced with out removing and rebuilding the caliper?
Thanks .
Phil
In order to replace that o-ring, the outer piston needs to come out. Not that tough really...get it on the bench (in a vise), remove the jam nut retainer clip, remove the jam nut, pop of the boot retainer ring and free up the boot, then use a punch or a 4mm allen key in the outer adjuster and hammer the piston and adjuster out...clean things up, replace the o-ring, then put it back together.
squirt some brake cleaner on it and dry things off real good and keep an eye on it. Leaks don't typically solve themselves. When the jamb nut is tight, it's pulling the adjuster flange against the inside of the casting...so in theory, if the surfaces are machined perfectly (which they're not) it shouldn't leak when the jamb nut is tight...but it does, and that's why the o-ring is there. I'd replace the o-ring at the very least, but recommend tear down, inspection, and new kits installed.
Has the fluid been changed/flushed at any point since the these were installed 5 years ago?