sound like the warning switch is bad. there is a part inside the kind of floats in the center. in your case that part should have moved toward the rear brake side and closed off fluid to the rear brakes. if your fronts didnt work, that tells me that part is stuck in the center. did the brake warning light come on?

 

 

I am not sure that the warning switch will actually close off the bad half of the system. I do wonder why he lost both circuits. My first thought which he confirmed is that his system is not stock, but you would still think half of the system would work if only marginally...

My brake warning light did come on immediately. 

Edited March 13, 201610 yr by dmoralesbello