WE PURCHASED A 2010 PRIUS IN AUGUST OF 2009 AND HAVE HAD THE FOLLOWING RECURRING ISSUES: 1. LOSS OF BRAKING WHEN SLOWING DOWN OVER ROUGH OR UNEVEN PAVEMENT, GRAVEL, WET LEAVES, SNOW, ICE, CRACKED PAVEMENT, POT HOLES... THE BRAKES ENGAGE FOR A SECOND, AND THEN WE EXPERIENCE NO BRAKING AT ALL FOR NUMBER OF SECONDS. WE TOOK OUR PRIUS INTO JON LANCASTER TOYOTA IN MADISON, WI WHERE WE PURCHASED THE VEHICLE AND TOLD THE MECHANIC OF THE BRAKING ISSUES WE WERE EXPERIENCING . HE CHECKED OUT THE VEHICLE AND SAID HE COULD NOT FIND ANY ISSUES WITH THE BRAKING SYSTEM AND SAID THAT HE HAD NEVER HEARD OF THIS PROBLEM AND NEITHER HAD TOYOTA. THIS LACK OF BRAKING RESULTED IN A REAR END COLLISION IN DECEMBER 2009. MY HUSBAND WAS DRIVING AT VERY LOW SPEED IN TOWN ONE EVENING AND THIS LACK OF BRAKING ISSUE OCCURRED AND HE SLID INTO ANOTHER VEHICLE. MY HUSBAND PUMPED THE BRAKES FOUR TIMES AND EACH TIME THIS DELAY IN BRAKING OCCURRED. THERE WAS NO BRAKING HAPPENING AT ALL. THE CAR WAS SLOWING DOWN FASTER WHEN THE BRAKES WERE NOT APPLIED, THAN WHEN THE BRAKES WERE APPLIED. THERE WAS FRESH SNOW ON THE ROAD. THERE WAS A DANE COUNTY SHERIFF AT THE INTERSECTION AND MY HUSBAND AND THE PERSON HE HIT RAN THE INCIDENT BY THE STATE PATROL WHO AGREED THAT IT WAS APPROPRIATE FOR THE TWO PARTIES INVOLVED IN THE ACCIDENT TO EXCHANGE INSURANCE AND CONTACT INFORMATION AND LEAVE THE SCENE WITHOUT CALLING THE LOCAL POLICE. THERE WAS DAMAGE TO OUR PRIUS FRONT BUMPER, AND TO THE BACK BUMPER OF THE OTHER VEH