I have a problem with the max, when ever I put the car in R and im stoping it makes this noise like a ummmmmm noise, and sometimes when im stoping at a light or something it makes that noise it sound like its coming from the back of the car, so I changed the back brakes and it still makes the noise, anybody know what it is??

 

wheel bearing?

 

Check the hanger bars for your exhaust. One might be broken causing your exhaust pipe to vibrate against something under the car.