 I read reviews before i bought the car and many comments said the brakes would go after only 15.  I mentioned it to the dealer and they discounted it to poor driving habits.  sure enough, at 14,800kms the front brakes and rotors had to be replaced.  they would not cover the replacement as i didn't get my regular maintenance done there.  the service absoulutely sucks.  you wonder why i didn't get my maintenance there.  my first and only maintenance was to get an oil change and winter studded tires removed.  when they placed the tires in the car they scratched my car and refused to admit it.  When purchasing a Sentra insist in writing that they would cover a brake job if they fail after <20k.