I just moved to a place a few miles out of town, and my road is gravel-covered. It frequently develops a washboard style surface, ridges a few inches wide which cause a very rough ride. The situation to be described occurs after I've driven ~1/2 to 1 mile on this surface, but does not occur when I drive on the rough but not washboard dirt road beside my road. So what happens? My brakes are mysteriously solid after driving on this surface. They're not bad normally, but they have a little more play than I like. After driving down this road, they're solid no play whatsoever. A few minutes after I leave the washboard surfaced road, they're back to normal. My mechanic commented just a couple of months ago (after installing rear axles and front bearings) on the fact that my brakes were nearly new and high quality.
Thanks for you help