I just did a complete all around brake job......well for the most part....I replaced Pads, Rotors, calipers, caliper brackets, and bled them........after doing so I no longer have good brakes.....what did i do wrong, or what do i need to do?

I also bled them back passenger===>back driver===>front passenger===>front driver.

I feel ridiculous as ive done multiple brake jobs before just never replaced a caliper and caliper bracket....

Oh wow and i guess you would kind of need to know which car im working on lol.....Pontiac Grand Prix GT 3.8L