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shimano brakes use mineral oil
the suggestion was to clean the pistsons that are protruding with mineral oil (this will also help lubricate the pistons)
then push the pistons back (ideally with the pads in so you don't damage the pistons themselves).
finally rinse everything off with isopropyl alcohol so you don't contaminate your new pads with disc brake fluid (mineral oil)
mineral water should not be involved in this process
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Is my brake broken?
Give it to a bicycle shop it make it less broken by you.
dancing james
edscoble
@CharlieCain
Ok, so I put the old pads in with the plastic bit in between, added the mineral water and it felt really tight on the brake, then pulled the plastic bit out, squeezed the brake with the old pads still in but nothing in between them and all the mineral water came out the left piston.
Is my brake broken?