Hello, You said you replaced the master cylinder, I am assuming you bench bled it before installing it. Did you replace the rear wheel cylinders yet ? Either fluid is not reaching the wheel cylinders or the bleeders are clogged up. To bleed mstr. cyl on vehicle pump up brake pedal and crack brake lines 1 at a time at the master cyl.& repeat until no air comes out w/ the fluid. After bleeding master cyl. pump pedal a few times and crack brake lines on rear of backing plate where they connect to the wheel cyl. on (RH) side and see if you have fluid present, if you have fluid there tighten line and crack bleeder if no fluid, remove and clean bleeder screw, if no fluid comes out with bleeder removed but fluid was present at line on rear side replace wheel cylinders, also a power bleeder may be helpful. Either way when you get fluid flowing thru bleeders, continue to bleed lines and re-filling master cyl. until clean fluid is present at all 4 corners, also bleed in order, (RR) first,(LR) second,(RF) next and (LF) last. Also if no fluid comes out of rear lines, but does come from both lines at master cyl. you may need to replace the proportioning valve. Hope this helps, let me know, Greg | 
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