i have replaced my differential yesterday, it wasn't to bad of a job to do it, but i ran into some problems along the way with my rear brakes.
I had to replace my wheel cylinder on the driver side as the bleeder got stuck and snaped. So i had to get another one with all the new goodies with it.
ie new brake lines, new shoes, wheel cyl and spring kit.
my dad and i blead the lines "all 4 of them" for quite some time and occasionaly, i apply the brake "on test drive" it will suddenly become stiff and won't brake. The thing is, it doesn't do all the time. 80% of the time, it will brake on a dime and some odd occasion, it will become stiff and hard to stop.
anybody have an idea of what might be the problem? i am pretty sure there is no air pocket in there, but i thought that maybe my brake booster is going or the master cyl.
or maybe a bad vaccum line?
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93, Chevy Astro van, Saphire Blue, Led tail light.
looking for:

Euro clear corner lights and Billet grill "chrome" and a good shinny 5 spoke rims and a disc brake rear differential