I dont know how you replaced your line, if you went all the way from the master cylinder back, or if you cut it at a place were it was good and replaced the bad. If you cut it, I have seen that when using a dull tube cutter the wheel will more or less just narrow the tube down to nothing when it cuts it off, if you do not deburr it the line will be pretty much pinched shut making much of the symptoms you are describing. I don't know if you have abs on the car or not, but I work daily at and abs engineering company and i can tell you there can be problems with that as well, IF you have one.

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2003 Dodge Ram 2500 Cummins - Georend fully built trans, Banks Big Hoss Bundle, Smarty Tuner, 5" turbo back exhaust. 500 HP and 1100 ft/lbs to the ground.
1979 Mercedes-Benz 300CD - Lost to a four car pile up on 275, Thank You Michigan Drivers.
1986 Mercedes-Benz 300D - Sold, Euro non-turbo car.