I am not going to lie to you.. it is very bad.. basically for the small mileage it has, it has received the harshest of beating.. with dozens of people driving it flooring the gas pedal than the break pedal, than the gas pedal, than the break pedal.. check out http://www.drivesrt.com/en/index.html and watch some videos to get an idea as to what has been done to your vehicle..

The sound coming from the breaks is pads or rotars which both will probably need to be changed among some other things.. other than that how does the car drive?

As for programing the garage door opener it is in the manual but if I recall you have to hold the right and left button simoultaneously while the key is in the on position till the light starts flashing, then hold the garage door remote next to the homelink and press hold the button on the garage opener and the button you want to serve as the garage opeaner in the homelink unit till the homelink unit starts flashing..