OK, so I was driving this home after I purchased the burb. I thought the M/C went cause in a panic stop the pedal went to the floor. I finally went out to confirm it was a M/C. This is what I found. No leaks in the engine compartment, front reservoir low. The front res. is for the rear drums. I checked under the truck for signs of a leak, nothing. Our streets are icy so I drove down the cul-de-sac applied the brakes, the rears do not engage.

Now, I'm loosing fluid, can't find evidence of a leak, Do I just keep looking on the rear brake circuit for the problem? Could the ABS be bypassing the fluid?