Compatibility of heavy vehicle brake systems

The Ministry of Transport, in conjunction with Land Transport New Zealand, is proposing changes to the law on heavy-vehicle brakes. One proposed change is that combination vehicles must have balanced brake performance under all load conditions. This raises the obvious question as to what will happen when one vehicle in the combination has been fitted with a brake system that complies with new requirements while another vehicle in the combination has a brake system that only meets the old requirements. To investigate the impact on performance of mixing brake systems a series of braking tests was undertaken. A rigid truck and full trailer combination with EBS brakes was modified so that the brakes could be operated in either EBS mode or NZHVBC mode and both vehicles were extensively instrumented. Full brake application stopping tests were undertaken from speeds of 30 and 50 kilometres per hour. From these speeds all possible 16 combinations of brake (EBS or NZHVBC) and load (laden or unladen) configuration were tested. Interestingly the best stopping distance performance was achieved by the NZHVBC brake systems but the improved directional stability of the EBS systems would allow drivers to use full brake application with confidence in circumstances where they would not do so with NZHVBC brakes.


  • English

Media Info

  • Pagination: 11p
  • Monograph Title: 9th International Symposium on Heavy Vehicle Weights and Dimensions, June 18-22, 2006, Pennsylvania State University, State College, Pennsylvania

Subject/Index Terms

Filing Info

  • Accession Number: 01388846
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Aug 23 2012 1:20AM