2003 z71 1500

I've replaced front calipers,rotors,pads, and brake hoses. And when trying to bleed the brakes I'm getting good strong fluid to the rear calipers but zero fluid to both front calipers. I've also done new master cylinder.

I've tried doing the automated abs module bleed with a scanner, and still no fluid up front. I'm stumped. Anyone got any suggestions??

 

Did you put the calipers on the correct sides? Bleeders pointing up?
You might have collapsed flex hoses or a faulty master cylinder.

 

yes calipers are in the right positions, could be a faulty master but I figured it was good cause I'm getting fluid to the rear. I've read where the proportioning valve could be causing my problem. Im gona try putting a new proportioning valve on and see if it fixes it soon

 

some MC's have separate seals and valves for front and rear.
Yes, if you have a PV that could be the culprit