[QUOTE=johnathan1;2446089]Well, my problem didn't really resolve itself...my brakes still WORK fine, but the pedal now feels spongey (was always firm before) and there is more travel than before.

So is a cheap new cylinder better than a cheap rebuilt?[/QUOTE]

Except in the case of the new Fenco I bought the price went up to around $88 about 2 months after I bought it.

Sometimes Master Cylinders have problems when the feed holes become restricted or plugged or some have little valves on the pistons that get gunked up. This can cause intermittent problems.

The same gunk can also temp fill in pits in the bottom of the Master Cylinder so they will seal sometimes and sometimes not.

But, from the symptoms you describe I would at least start shopping for a new or rebuilt one so you already have a line on a good price. I say this because in the end it is not going to get better and unless you have an exterior leak a properly Filled Mastery Cylinder should never cause your Pedal to go to the Floor.

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84 300D, 82 Volvo 244Gl Diesel