Need Brake Help!

Hey guys i was wondering if anyone has run thru this in any car and what it was, my friend is a mechanic and he's thinking its the brake booster, but id like to get some feedback.

Problem: The brake pedal is really hard to push down, i mean we just put front rotors and pads on and bed em in and the pedal is still hard feels like ur driving on drum brakes. I took the rears apart and the rotors are junk not worn evenly so i didnt put rear pads on (which i have) but gonna wait for rear rotors as well.

Found a seized front slider but still hard brake pedal does anyone have any idea?

Thanks guys

[Alero2k4]

Not sure if this is possible on these or not, but on my mom's Bonneville, she had something in the abs I believe it was, and it actually made the pedal feel like you had absolutely 0 assistance. I mean absolutely no power help, really a PITA and unsafe to drive. Good luck.

yea but woudnt it leave an abs light if something was screwed up in there?

[Alero2k4]

Sorry, I can't remember if it threw a code or not. I believe it did, but I am not sure. I was just throwing it out as an alternative if that turns out to not be the case.