so my car is mostly stock minus exhaust and intake. this morning before i headed to work i was backing up my car from my garage and i heard a "shrieking" noise coming from the passenger side. i slowly in pulled out of my neighborhood and i heard the noise again it became louder and louder then when i braked it stopped and didn't have noise again. then when i went out to lunch that "shrieking" noise came on again. it doesn't seem to be a engine problem. any help would be great. thanks furtherhand.

 

Low brake pad indicator?