Thanks Glasman.

I bought the truck as a project in July. Getting ready to drop a new, working engine in it this week (old one was seized and had water in the block). I figure once I get it to run I need to make it stop.

I pushed down on the brake pedal and it went straight to the floor. I popped open the MC and added brake fluid. When I pushed down on the pedal again I saw the fluid "bubble" a bit and the brakes started to feel less spongy. I went back a week later and the brakes went back to the floor.

Does it sound like I need a new MC too, or should I try bleeding first and see what happens?

Thanks for helping a Newbie