Odd Brake Noise/Feel after rotor install?

[classicauto]

Pedal going to the floor = BADDDDD!

That is either (order of likelyhood):

-Master cylinder (wouldn't be leaking, the problem is the fluid bypassing the cylinder when you press the pedal because the bore/cylinder are worn, thus a low pedal with no or very little brake pressure)
-Boiled or watery brake fulid
-Bad caliper(s) (they would be leaking)


As far as whether any brake parts are sticky or not, DON'T pull the pads and have someone step on the pedal. You will likely shoot the piston out of the caliper with the removed pads. You can check the freeness of the piston a number of ways:

- Rotor and pad wear. Is it even? Are the pads tapered? Is one side worn significantly more/less then the other?
- Remove the caliper, compress the piston(s). Is one harder to compress then the other? One stuck?


I would be seriously worried about that progressive pedal though. The only way the pedal can reach the floor is either by a leak, or a worn master. And either of those spells imminent fail. If the pedal goes low, but you can pump it and it get stiff (and stay stiff!) there's likely air in the lines.