2001 Cadillac Deville Problems with the Breaks

I took off the old break caliper and was going to put the new one on.
My granddad told me to wait so the whole day the break caliper was off and off the break line
next day we put the caliper and router on there and was going to bleed the breaks
while pumping the breaks the break pedal got loose n not getting hard at all
what should I do