One problem related to brake disc pads has been reported for the 2009 Subaru Impreza. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2009 Subaru Impreza based on all problems reported for the 2009 Impreza.
Rear left brake started making a scraping sound as if the brake pads were worn and gouging the rotor, also the brake pedal was pulsating as if the rotor was warped. Upon inspection I noticed that the brake pads were not worn but in fact the smooth surface on the back side of the rotor was chipping away and the rotor was very rough,. These are the original rotors and the rear left was the only one with this problem although the rear right rotor was worn badly also but the pads barely showed any wear. These rear brake pads are the second set since the car was purchased new by me.