after i got a complete new exhaust system,my front break line was leaking.i noticed when the fn break pedal went to the floor.the leak was coming from rubber on my front line(passenger side)repaired it.3 days later,then my driver side began to leak.repaired it also.it appeared to me that they were cut.to very fine cuts.then my trucks starts smoking,i thought it was ele. fire.it was my front breaks ( calipers) ,seizing up.had to replace them also.then i noticed that my master cylinder cap rubber was swelling up.like the break fluid is getting to hot.now the main problem that i got is i am not getting any break fluid to my rear break.the pin on my combination differential and metering valve or hydraulic system control valve assembly seems to operate properly when turning ign. key.ive loosened the lines on the control assembly to check for break fluid,its there.ived loosened the bleeder tip on the hydraulic valve(located inside the frame rail over rear axle driver side)no fluid.ive loosened the vent screw over the rear axel,no fluid.any suggestion on what any of you professionals think.also using my e-break to slow myself down.