I'm having no luck getting the rear brakes to work on a neighbors 55 GMC 350 series truck. I've bled the brakes numerous times but still no pedal. The master cylinder went out and I installed a new one but can't get the rear wheel cylinders to even move. But when I bleed them I get solid fluid. I plugged the rear line just before the rear wheel cylinders and have plenty of pedal. So I'm thinking the problem is in the rear. Any suggestions? Thanks,....
