STOP AND GO TRAFFIC. STOPPED AT TRAFFIC SIGNAL 4 CARS BACK. TRAFFIC STARTED MOVING ON GREEN LIGHT, I TAPPED MY BRAKES 3X, 4TH TIME NO BRAKES. I ROLLED INTO THE BACK OF A JEEP SLOWLY, 2MPH, WHILE STANDING ON MY BRAKE PEDAL WITH NO HYDRAULIC PRESSURE AT ALL. WE MOVED TO THE SHOPPING MALL PARKING LOT, BRAKE PRESSURE WAS RESTORED. HAPPENED ONLY WHEN PUMPING BRAKES REPEATEDLY AT SLOW RATE OF SPEED. BROUGHT VEHICLE TO DEALER. TOLD BRAKE BOOSTER WOULD HAVE TO BE REPLACED. CUSTOMER SATISFACTION PROGRAM # 13N02.COMPLETED 7/29/14. PREVIOUSLY RAN VEHICLE HEALTH REPORT THROUGH MYSYNC = BRAKES OK. FEB'14 - OIL CHANGE AT DEALERSHIP. ASKED ABOUT LETTER I RECEIVED ABOUT BRAKE BOOSTER BUT WAS TOLD "I WASN'T READY FOR THAT JUST YET. I WOULD FEEL SPONGY BRAKES BEFORE IT NEEDED REPLACING". THEY DROVE MY VEHICLE INTO BAY AND TECH SAID BRAKES WERE FINE. OBVIOUSLY NOT. BRAKES FAILED WITHOUT WARNING. 77% INCREASE IN PREMIUMS DUE TO MERIT RATING BOARD, INSURANCE AGENT SAID THEY COULD DO NOTHING ABOUT SURCHARGE (10 YR OLD JEEP BUMPER THAT WAS ALREADY RUSTED OUT) .