Help bleeding brakes?

[rddiaz]

Hey guys,
I've been trying to get my brakes to work so I can actually roll it outside and pressure wash the frame before I paint it, but I can't seem to get them to bleed right. I mean the back wheels bled fine but I can't get the front to. I thought it was the combo/prop valve but there is no brake light in the cab, so I tested it anyways with a tester light like the (CPP link )mentioned, it said if the light didn't come on, it was positioned in the middle; otherwise good! So what am I not doing? or maybe I'm doing something wrong? please let me know.......thanks ahead of time.