Leak somewhere ?

[George Humphrey]

I have a '64 Special non power brakes, I went for a cruise this morning and the brakes felt spongey and close to the boards, I checked the master and it was almost empty, I filled it up and now they are right up there, firm and responsive, it did this the year before last, I've checked around the car, I had a posi installed at Libson drivetrain the year before last and they had to replace the rear wheel cylinders and shoes, everything looked fine, I looked at the lines up front, no leaks that I could see, any thoughts?

[WildKitty]

Look INSIDE the drums, that was the first thing that went on my 64 Wildcat; the left front cylinder was lleaking - almost cost me a grill, good thing I knew where the emergency brake pedal was