Ok,,,i have a 69 G.T. Fastback that i had been doing brake work to.I replaced the master cyl.,,,prop.valve,,,,and STILL could not get even a hint of a good pedal.Bear in mind that the spindles and calipers came off a 69 Grande,,,and i put them on my car just as they came off the coupe.I am at my witts end with this thing,,,,when i call a friend of mine(Charlie Cheney),,and he informs me to swap sides on the calipers!!Ok,,i did that and now i have a brake pedal that is better than new!!Has anyone ever ran into this rediculous problem before?????I have owned over 40 of these cars,,,,many with Disk,,and NEVER had this happen b4.