Dodge Caravan Brake Shake

My Grandcaravan Has Started To Shimmy Badly When Braking At High Speeds. At Lower Speeds, It Feels Like It Is Pulsing. What Is The Cause?

The Grnd Caravan I Drive Shakes Really Bad When I Brake At Speeds Between 45 - 70 Mph What Could Be The Problem

I Was Driving Lately And When I Reched The Traffic Light, It Was Shaking When I Pressed The Breaks To Slowdown And Eventually To Stop. It...

My Car Shakes Only When I Break At High Speeds 50mph Or Higher.if You Apply The Breaks Slow And Stop And Reapply Its Not As Bad But Still...