66 coronet,10" drums,manual,have been working fine for last few years but now have a problem..The pedal started going to the floor,so I bled all the way around.the shoes still have meat on them and are all adjusted so that the wheels move about a 1/2 turn when spun off the ground.My big problem is that when the pedal goes to the floor,slowly,sometimes I can pump them and I have pressure again although the pedal will still go slowley to the floor when depressed.On a lot of occasions now I must use the side of my foot to raise the pedal as it does not always return .When I bring the pedal back up I have presure again.The pedal does not always go to the floor.It is worse as the brakes heat up.I have some ideas,just need some input.Thanx.Mitch