NHTSA'S HEAVY DUTY VEHICLE BRAKE RESEARCH PROGRAM REPORT NUMBER 9--STOPPING DISTANCES OF 1988 HEAVY VEHICLES. INTERIM REPORT

A 1978 ruling by the U.S. Ninth Circuit Court of Appeals effectively eliminated the stopping distance requirements in Federal Motor Vehicle Safety Standard (FMVSS) No. 121, Air Brake Systems. Recent interest in reestablishing heavy vehicle stopping distance requirements resulted in the need to evaluate the braking performance capability of current vehicles. This report describes testing to determine straight line stopping capability of two single unit trucks and six truck tractors. The single unit trucks were tested empty and fully loaded while the truck tractors were tested bobtail, with an empty and with a fully loaded trailer. Tests were conducted to determine the effect of automatic front axle limiting valves (ALV), bobtail proportioning systems (BPS) and antilock braking systems (ABS). All tests were straight line stops from 60 mph on a dry concrete surface.

Media Info

  • Features: Figures; References; Tables;
  • Pagination: 33 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00607627
  • Record Type: Publication
  • Source Agency: National Highway Traffic Safety Administration
  • Report/Paper Numbers: VRTC-87-0052, HS-807 531
  • Files: HSL, TRIS, USDOT
  • Created Date: Apr 30 1991 12:00AM