The most common problem for what you described is the rotors. For the cost of them just replace them and go from there. If they look smooth you can get away without replacing the pads like Ranger said, if they have grooves worn in them at all replace the pads too. For the cost of pads I always replace them with the rotors if they're needed or not.
The dealer isn't trying to sell you anything by saying it's warped rotors other then trying to fix the problem. Whether it can happen or not that's the most common name for that problem because of the way it feels. If they tell you the problem is dirty rotors you'd instinctively think why don't just clean them instead of trying to sell me the new part. Usually if a front caliper is sticking the car will try to pull to one side.
The dealer isn't trying to sell you anything by saying it's warped rotors other then trying to fix the problem. Whether it can happen or not that's the most common name for that problem because of the way it feels. If they tell you the problem is dirty rotors you'd instinctively think why don't just clean them instead of trying to sell me the new part. Usually if a front caliper is sticking the car will try to pull to one side.
