@JohnNewb No, there's no fluid leaks at Idle. It just feels like it has either a big air bubble in the PR brake line or a clog given how very little fluid flows out compared to the other lines. I may need to take more of the line apart to find out.
The rear brake line follow this path. Master cylinder has a line that goes along the drivers side of the tunnel inside the car and out by the transmission. It should split there and go to a set of hoses to the wheel cylinders. You might have a pinched metal line or more likely a clogged/rusted metal line.
Since you said the brakes were not that good, it could be that only the front brake system is actually working since it is completely separate from the rear brake system. Sometimes the interior section of brake line will rust out by the drivers seat. You can get a clog in the line going back to the rear of the car. The front of the clog may still have air and so will allow the pedal movement to seem ok. The line from the rear of the clog could have a rust hole (there or somewhere further back), so when you draw fluid from the wheel cylinders you will keep getting air.