cleaned and bled my 2nd bikes brakes as I reaslied one piston in each had seized, not a problem ive done this before, calipers off, pistons out and cleaned. All working again nicely and new pads in, lovely.
Then I realise I put mineral oil in what had previously had dot 4...... I know that using dot 4 in mineral oil brakes (shimano) will kill the seals and stop the brakes from working, but what about the other way around, have I made a big boob or will it be ok with mineral oil? If so is it just the piston seals or are there others?