No leaks and no rear brakes....need help

Need some help please. There is a lot going on with this one.

I have a soft brake pedal
There are no leaks of any kind anywhere.
I have no rear brakes. If I push on the brake you can spin the tire by hand.
Entire system has been bled. Some fluid comes out the back brakes, but won't hold pressure of any kind. I replaced the master cylinder and that did not fix it.

I am thinking it is either the Brake Load Sensing Proportionate Valve isn't letting fluid through or the ABS system either has air in it or it is bad.

Front brakes bleed perfectly, but the rear brakes hardly any brake fluid comes out. Emergency brake does work when activated and the rear brakes are engaged like they should be.

Has anyone ever experienced something like this before?

 

Be careful out there. My sister had a vehicle with faulty brakes and wrecked her car ~ couldn't stop at the bottom of a hill at a "T" intersection.

 

Rears should bleed fine, not as fast though. Take it to a shop.

 

- side note - The emergency brake is cable actuated for the drum style brakes in side the hub housing in the rear discs.
1.) when you bleed the brakes you should always start with the brakes furthest away from the master cylinder so for are Tundra's it would be passenger rear , drivers rear, passenger front, drivers front.
2.) I would put a power bleeder on it and keep the master cylinder topped off and see where it goes.

a few questions though
1.) what was the original issue? did it just stop working? did you do brakes or servicing of any thing?
2.) when you changed out the mater cylinder did you bench bleed it?

 

I'd say there's still air in the system and you need to bleed the rear brakes more. I've never had less brake fluid come out of the rears than the fronts after a brake change.