Trailer Brake Stopping Distance

I wouldn't think there should be grease on the brake linings unless it were done that way at the factory since it is a brand new trailer. The axles haven't been greased since. I'm not sure if the guy who adjusted that would have noticed anything on the brake pads - he didn't say anything about it.

I don't have any gravel roads around home to try but we are headed out with the rig this week and will definately come across some. Sounds like there is some hope that they simply need to wear themselves in. I'll sure be paying attention to them!
Thanks