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There's nothing wrong with the stock master cylinder, pads, etc.. I think there's something with the design or assembly of the hydraulic system that allows air bubbles to hide out. A lot of people seem to have chronic brake squish on these bikes.
I basically lost the front braking while on a ride about a year and a half ago. On minute everything was fine, the next I pulled the lever just about to the stop and...nothing. Scared the ***** out of me; luckily I was coming to a stop on an uphill section with plenty of space. I was sure I had a broken hydraulic line/fitting/etc and would find fluid dismissed from the system -- but a thorough roadside inspection revealed nothing wrong except very squishy brakes. Pumping them up gave back my (squishy) braking but not confidence in them.
I bled the system that night, and the brakes improved...but still were not as firm as the revamped / ss line brakes on my '95 Sprint. Over time, they seemed to get a little squishier.
Now it gets weird. Had new tires fitted a few weeks back, and when I took the bike back I nearly crashed leaving the lot. Rock solid, hair trigger, one-finger squeeze braking. The shop did nothing to the brakes except remove and reinstall the calipers with the wheel change (and maybe dislodge a trapped air bubble?). I don't have a good explanation, but I sure hope they stay like this.... :-D
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