I installed my brembos and AEM brake pads yesterday, and it feels different now, it feels like I have to press down more on my brake pedal, is there a reason for this...?

 

Usually right after installing brand new pads/rotors it may feel soft, you need to bed the pads in correctly and the pedal SHOULD come back up after that, if not you may need to bleed your brakes lines of any air.

 

bleed the lines, use like 2-3 bottles of dot3/dot4 brake fluid. just make sure theres always fluid in the lines, and no air bubbles. air in the lines will make the pedal feel "mushy"

 

what AEM Pads did you use. Some pads need to get really hot b4 they start working. Mainy racing pads.. and AEM's might be racing pads...

 

did u pump the pedal for a while after the install? u should always do that right after, then check ur fluid level. If it is low u can fill it more or change it if u want.
when u pump the pedal u force the air in the line up to the resevoir, it shouldnt be neccessary to change the brake fluid unless u havent in many years or u wanna upgrade.

 

It might also be a factor of the coating on the rotors and the brand new pads. Scuff the rotors and spray some brake cleaner on them. Then wipe that down and take it easy on the brakes until you get the pad properly bedded to the rotor (I don't know the procedure for the AEM pads, but if they are street pads just take it easy for the first 500 miles or so). The fluid should be changed if you haven't done that in a while, but there's nothing that you did with the pad/rotor install that should have changed the condition of your fluid (other than pushing more of it into the MC if the AEM pads have more material than your old pads).