In spite of the improved reliability of the present braking systems, achieved by increasing the number of parallel links in the system, there still remains an especially delicate question relative to the reliability of the brakes themselves. Among other things they are liable to a special sort of failure, so-called transient failures, which affect the reliability a great deal and are very difficult to evaluate precisely. Transient failures, as a specific sort of failure in braking systems in respect to reliability, are manifested as a considerable temporary loss of braking efficiency. These failures are not of stable character and after a period of time the braking efficiency is spontaneously regained to approximately the same level as prior to the occurrence of such failures. The possibilities of identifying transient failures in service are very small. This is the reason why the importance of such failures should be stressed even more, since the driver very often is not aware of their occurrence. Namely, the basic transient failures are: fade, contamination and the vapour lock. The author suggests that the best way for evaluating the importance of transient failures is the development of laboratory testing methods and the appropriate theoretical analysis of the probability of their occurrence. In addition to this, the paper explains the mechanism of occurrence of transient failures, it gives the principles of the developed testing methodology which involves a great number of fade and contamination tests, and it offers some basic conclusions associated with the importance of the problem which are obtained from the performed testing. /Author/TRRL/

  • Supplemental Notes:
    • This report was presented at the 16th International Automobile Technical Congress.
  • Corporate Authors:

    International Federation of Auto Techniques Engs

    3 Avenue du President Wilson
    F 75116 Paris,   France 
  • Authors:
    • Dedovic, V
  • Publication Date: 0


  • English

Media Info

  • Features: Figures; Photos; References;
  • Pagination: 9 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00165635
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Report/Paper Numbers: Analytic
  • Files: ITRD, TRIS
  • Created Date: Jun 14 1978 12:00AM