TRAVELING AT ABOUT 45 MPH WITH ABOUT 3 TO 4 CAR LENGTHS BETWEEN US, TRAFFIC IMMEDIATELY AND ABRUPTLY STOPPED. I STOMPED ON THE BRAKE PEDAL ONLY TO FIND IT HARD AND RIGID WITH LITTLE RESPONSE. THE TRUCK SLOWED BUT WOULD NOT STOP. I REAR ENDED THE CAR IN FRONT OF ME. RESULTING IN SUBSTANTIAL DAMAGE TO MY TRUCK AS WELL AS THE OTHER CAR, ALSO A TICKET FOR ME. THE TRUCK DIDN'T SLIDE, JERK OR ANYTHING, JUST GRADUALLY SLOWED TILL IMPACT. I DRIVE A TRACTOR-TRAILER THAT HAS BETTER BRAKING RESPONSE. *TR