Brake pedal play

[nh_mopar_fan]

I'm getting into this 66 Valiant. One of the issues it has is that the brakes pedal just "falls" completely down and the brake lights go on. There is a ton of play in the pedal. I have no checked fluid level yet but I have never seen this happen on any car I've owmed in the past unless there was a line or wheel cyl blown. That doesn't appear to be the case.

Any ideas?

[Charger_Fan]

When you say it "falls down", you do mean it goes to the floor when you step on the pedal, right?
I had a bad master cylinder once that had an internal leak. The fluid would bleed past the pressure cup & fill in behind (but not past the end seal, so no external leak), resulting in a pressure loss. With just light pressure on the pedal, it would take maybe 10 seconds before it went to the floor...if I stomped on it with lots of pressure, it would hold it longer, but would eventually bleed down & the pedal would ease to the floor...usually it took about a minute.

I replaced the master cylinder & all was right with the world once again.

[tan top]

sounds like a master cylinder  problem to me as well .

[aceman]

I too had the same problem and it was the master cylinder