I've got an 01 FXST, Everytime it sits for a day or two, or sometimes even overnight, my front brakes lose pressure. Once I pump them up they are fine. Is my master cylinder shot? It doesn't leak fluid, just loses pressure. Needs new front pads soon, but that should have anything to do with it, I think.

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the rebuild kit is pretty cheap/ yours maybe going bad. Try leaving master cover off all night and strap brake lever back as though your&nbsp\\;holding brakes. keep it strapped tight all night. sometimes they bleed funny and that is one of the tricks, works air out through top. worked on 3 of my customers bikes so far.