On your truck, you are right in that when you pushed the pistons in- you
probly rode over some junk. but also pushing the wheel cylinders in may
have caused some air to be sucked into the cylinder.
If you haven't installed the new ones yet, try bleeding each one till
you get a good steady drip.
And as the other guy stated, adjust your brakes up with the adjuster,
backing up will never bring them up to where they should be.
Extend the adjusted a few clicks and try to slide the drum on, if its
still loose-adjust alittle more. once they are adjusted properly you
will hear the shoes just rubbing against the drum-but will be able to
turn the drum freely.
If after all of this, the pedal is still low and the brake light/abs
light is still on, you may have a baddump valve. the chey trucks are
famous for this valve going out for the slightest reason. I've replaced
many over the years, I'm a brake and front end mechanic.


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ssggbroot
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