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Q: trouble bleeding back brakes on 1991 GMC Vandura 2500

The rear brake line blew out half way back. I drove the van for 2 or 3 short trips with just front brakes. I replaced the brake line and am trying to bleed the back brakes, but when I have someone hold down the brake pedal while I open the bleeder valve, nothing happens. Is there some component that needs reset to allow fluid into the back system again? Also, the brake light on the dash is on.
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air bound. the light is on showing hydaulic difference. when you get a peadl, it will go out. you may have lost the master cylinder since the pedal went to the floor. it may have ripped the seals in the master.

you will have to blead with computer because of abs system you could have mest up mastercylinder bleed at mastercylinder take a line wrench pump up brake pedal hold down them bleed each line on mastercylinder unless you no witch line go to rear
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