'70 F250 with a 360/C6 and brakes had been working fine. It gets occasional use for home projects, nothing hard-core. Jumped in the other day just to move it to the other side of the driveway and found the pedal went almost to the floor.
Popped the master open and found the rear reservoir bone-dry, the front full. Visually checked the rear and could not see any weeping. Pads all around are fine but what am I missing as far as diagnosing hydraulically? I'm a FNG at brake stuff and don't want to F it up.
Thanks for any help,
1970 F250 SC, 360ci, C6, rattle-can black, 17" MB chrome wheels