ON 1 DEC 2009 I WAS DRIVING BEHIND A LEBANON RIII DISTRICT SCHOOL BUS AT APPROXIMATELY 3PM ON WASHINGTON AVE IN LEBANON MO. I WAS DRIVING MY 2007 TOYOTA TACOMA AT APPROXIMATELY 20-25 MPH WHEN THE SCHOOL BUS BEGAN TO SLOW TO MAKE A LEFT TURN. I WAS APPROXIMATELY 30 FEET BEHIND THE BUS AND LIFTED MY FOOT OFF THE ACCELERATOR TO COAST MY TRUCK AND THEN BEGAN TO BRAKE WHEN THE BUS STOPPED TO MAKE ITS TURN. WHEN I APPLIED THE BRAKES THE TRUCK DID NOT SLOW, INSTEAD IT KEPT AT ABOUT THE SAME SPEED DESPITE PRESSURE ON THE BRAKE PEDAL. AT FIRST I THOUGHT I HAD BRAKE FAILURE AND PUSHED HARDER ON THE PEDAL AND WAS PRACTICALLY STANDING ON THE PEDAL WHEN I IMPACTED THE REAR OF THE BUS. THE CRASH RESULTED IN MINOR DAMAGE TO THE BUS, BUT MAJOR DAMAGE TO THE TACOMA ($8K). THERE WERE NO INJURED CHILDREN ON THE BUS, HOWEVER, SOME PARENTS TOOK THEIR CHILD TO A DOCTOR FOR A CHECK-UP. EYE WITNESSES OF THE ACCIDENT VERIFIED THAT I TRIED TO STOP THE TACOMA AND COULD NOT. ADDITIONALLY, THERE WAS APPROXIMATELY 20 FEET OF FRESH TIRE SKID MARK BEHIND THE TRUCK WHICH INDICATED THE BRAKES WORKED AS INTENDED. THE CRASH OCCURRED AFTER BOTH VEHICLES HAD CROSSED A SERIES OF RAILROAD TRACKS AT A TRAIN CROSSING. I CALLED TOYOTA LATER ON IN THE DAY TO REPORT THE ACCIDENT AND FOLLOWED UP BY MAILING A NARRATIVE DESCRIPTION OF THE ACCIDENT, POLICE REPORT AND INSURANCE ADJUSTER'S ESTIMATE OF DAMAGES TO THE TRUCK ON 15 DEC 09. TOYOTA ALSO SEND A REPRESENTATIVE TO INVESTIGATE THE TRUCK WHO INTURN FILED A RE