Attempting to bleed the brakes with power bleeder.
Right rear has continues flow of air bubbles
Left rear has solid stream of brake fluid
Right front has light flow of air bubbles
Left front has solid stream of brake fluid

No visible leaks.
Power bleeder holds 10 Psi pressure for extended period of time with no drop.

Brakes work fine and car does not veer to the right or left when applying brakes

What is causing the air bubbles?

 

Did you know brake fluid absorbs water? Water lowers the boiling point of the brake fluid. Heavy brake use, as in going down a mountain pass, can cause the water in the brake fluid to boil causing loss of braking. Brake fluid also protects expensive Antilock brake system components. Most carmakers recommend changing/flushing the brake fluid every two years, some recommend yearly.

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Sherlock:

Wow, I am going to get jumped on after telling you this. Lots of folks love those power bleeders because they are easy to use.

I have used a power bleeder in the past and found the one I used to be less than optimal. It took forever to change the fluid, and used far more fluid than it should have. The reason, I think, is that the flow is slow small it really doesn’t flush out the old stuff or air very quickly. I have since resorted to the old fashioned two person method.

Now to your problem. I’m guessing you do have some air in the lines, and perhaps it is being caused by the power bleeder. You could have an internal leak inside the power bleeder jug, or at the top of the feeder tube. I’d do an old fashioned bleed on all four wheels to see if you still have air.

Good luck