I just replaced both front calipers on my 1998 ranger 4x2. I'm using a vacuum tester/brake bleeder which works pretty good. I bled the master cylinder just for kicks to make sure, got the front left bled no problem, but now I can't get the front right bled, it's like it's sucking air from somewhere or it can't suck the fluid through but fluid is coming through because it will fill up the bleeder jar eventually but is a lot more air that fluid. I can't find any leak in the lines or anything. Any suggestions? Coming from the opposite side of the vehicle, can there be that much air in the line? Ive run through the bleeding process about 5 times filling up the bleeder jar each time with about 2 or 3 inches of fluid, but still mostly air. thank you

 

hmmmm, I think I might have a master cylinder problem. I started the truck and checked the pedal and it was like there were no brakes at all, so I grabbed a helper to pump the brakes while i bled them and when they held the pedal and I cracked the bleeder, I get no fluid or maybe just a trickle. So, master cylinder? the truck sat for several months over winter without any use.

 

Yes, that is what it reads like, Master issue, IF both front brakes have the same symptom.

The flexible brake lines on the front wheels can collapse internally, this will cause similar issue in just one wheel