losing brakes

Ok, well I went through the rear brakes. They were a bit out of adjustment so I feel like I got them straightened out. However that did not solve the problem. I noticed that when I am backing up AND turning the steering wheel to the right the brakes fail (lose pressure) and the pedal goes to the floor. I am still not seeing any leaks. If I turn the wheel to the left while backing it does not do this.

Any other suggestions?