I WAS DELIVERY FOR DHL FOR 5 HOURS PIER TO THE ACCIDENT. I WAS ON A CITY STREET IN UPPER CHI-CHESTER, PA. WHEN I TRIED TO YIELD AND PREPARE FOR A STOP SIGN. WHEN I WENT TO APPLY THE BREAKS AND ADDED MORE PRESSURE TO THE BREAKS THEY JUST THEN DROPPED THE FLOOR. I THEN TRIED TO PUMP THE BREAKS, STILL NOTHING, NO BREAKS. FROM NOT BEING ABLE TO STOP AT THE STOP SIGN, I WENT THROUGH THE INTERSECTION CAUSING AN ACCIDENT. AFTER RESEARCHING ONLINE, I HAVE FOUND THAT THESE VEHICLES HAVE ALOT OF BREAK PROBLEMS AND A NUMBER OF REPORTS THAT SHOWN BREAK FAILURE TO THESES TYPES OF DELIVERY VANS.