hello,

In the driveway not running, pumping the pedal will built some pressure then it will slowly go to the floor.

On the road running the pedal just goes to the floor and will give lite to mild braking

There are no leaks to be found and the fluid is at the same level before the issue

I did check the plastic line that goes from the Booster to the front side of the motor and seems to be in normal condition.

Any help or opinions on this will be greatly appreciated

Thanks,
Chris.

 

If you're certain there's no external leaks, and internal leak in the master cylinder will cause that condition. The seals inside it have failed and prevent it from building pressure in the hydraulic system.

It's also possible the master cylinder is leaking externally...into the vacuum booster. If that's the case, both components must be replaced.