2 issues I need some help with
 

Hello everyone I have just recently traded my 03 srt4 for a 06 300c and have a couple issues and questions.. First off the brakes were bad on the car when I got it so I bought new pads installed them inspected everything used grease and everything seemed good after driving for just a bit I noticed the drivers side rear brake was squealing and makes a strange rotational noise when not on the brakes.. it's like 1 thing is hitting the rotor every revolution and can figure it out the new pads have been on for about 3 weeks so that is plenty of break in time oem pads as well I don't understand why they are sqeeking... the second question is I get a check tpms on the evic and have no tire pressure readings at all so I'm trying to figure out what needs to be done in both situations thanks in advance