CERTAIN HEAVY DUTY TRUCKS FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 121, "AIR BRAKE SYSTEMS." THE PRIMARY AND SECONDARY AIR SUPPLY HOSES FROM THE FOOT VALVE…
ON CERTAIN SCHOOL AND TRANSIT BUSES BUILT WITH BOSCH ZERO OFFSET PIN SLIDE (ZOPS) HYDRAULIC DISC BRAKES, THE ZOPS HYDRAULIC DISC BRAKES MAY EXPERIENCE CALIPERS STICKING IN THE APPLIED POSITION, WHICH CAN…