Mian wrote:
1. you can jetwash your bike, just keep the jet away from the bottom
bracket/ fork seals/ suspension pivots etc.

I am not sure I paid attention to keeping the jet away, but also I
didn't
insist on any particular area, so I guess I should be fine...

2. the squealing could be caused by water trapped between the pad and
the
piston

You are right. After drying overnight, the squealing is completely
gone.
I will have to be more careful when washing the brakes (I still need to

clean them periodically: I bike in a place where the ground is a
kind of granitic mud/grit that gouges the discs when it gets inside
the brakes).

Thanks,

Peter

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