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Message: <blockquote data-quote="glkm" data-source="post: 125154" data-attributes="member: 3412">Well, I thought I read the book thoroughly before I started, but I missed one small very significant detail.  I pulled the caliper off my front left (front brakes needed a lot of pressure to stop at slow speed).  I had a previous fork seal leak (which I fixed with new seals and progressive coils) which coated my front left rotor and pads.  Pulled the pads and they were almost down to metal - pistons out about an inch or so.  I bought new pads, used a c-clamp to push the pistons back in and heard a very high pitched noise from the top of the bike, then all of a sudden a release and my plastic window in my master cylinder was bouncing off my RV side.  :doh: I had neglected to take the top off the MC or open the bleeder valve at the caliper.  Found out that that window is not replaceable, so just pushed it back in, finished the pad swap, refilled the MC, cleaned all the brake fluid off the MC and tried the lever.  Very quickly it became firm so I kept squeezing the handle as hard a I could to see if and when the plastic window would pop out again.  Nothing, no leaks.  I am flummoxed.   :headscratch: Does anyone know why? Any idea if I am totally  :sensored:?  Has this happened to anyone else and does anyone have any advise?Thanks in advance - Gavin</blockquote>