ASSESSING THE CORROSION OF HYDRAULIC BRAKE PIPES ON MOTOR VEHICLES

DIE BEURTEILUNG DER KORROSION VON HYDRAULIKBREMSLEITUNGEN AN DRAFTFAHRZEUGEN

Measurement methods used in the testing of materials are studied in relation to their suitability for testing corroded built-in brake pipes. The study shows that all traditional methods of examination are too expensive and in certain cases even dangerous for the examiner (nuclear physical methods). It is a disadvantage that those brake pipes situated in the most corrosion prone places are also the most inaccessible. On the basis of systematic bursting tests, the second section of the paper determines what degree of compression stress corroded brake pipes will stand and how much the wall thickness can be reduced before splitting occurs in the case of emergency braking. Mechanically worn pipes were studied for the purpose of a precise comparison. The studies revealed that bursting pressures of 1500 bar occurred even on brake pipes built into sixteen year old vehicles. Only in cases where the wall thickness has been reduced to approximately 0.05 mm is cracking of the pipes to be expected. An analysis of the dependence of corroded brake failures on age shows that a type of old age split occurs in the seventh year. The older the car the greater the element of risk involved. In the case of badly maintained vehicles which exceed the critical age, it is left to the judgement of the examiners to demand proof that invisible brake leads have been renewed. In future the risk can be markedly reduced by not laying brake pipes in inaccessible cavities of the body or floor of the vehicle, unless they are capable of being flushed out. In this way the corrosion areas caused by wet, dirt and deicing salt residues can be avoided. /TRRL/

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/3181202517
• Corporate Authors:

  Deutsche Kraftfahrtforschung i Strassenverkehrstic

  VDI-Verlag, Postfach 1139
  D-4000 Duesseldorf,   Germany 
• Authors:
  • Hutter, M
• Publication Date: 1975

Language

• German

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 16 p.
• Serial:
  • Deutsche Kraftfahrtforschung u Strassenverkehrstec
  • Issue Number: 251
  • Publisher: VDI Nachrichten

Subject/Index Terms

• TRT Terms: Age; Brakes; Compression; Corrosion; Failure; Hazards; Hydraulic brakes; Hydraulic fluids; Hydraulics; Inspection; Loss and damage; Maintenance; Measurement; Motor vehicles; Pipe; Research reports; Stresses; Vehicles
• ITRD Terms: 1057: Air transport network; 1361: Brake; 5252: Corrosion; 1614: Damage; 5431: Hydraulics (fluid); 3361: Pipe; 8559: Research report; 9150: Risk; 1575: Vehicle inspection
• Subject Areas: Highways; Maintenance and Preservation; Safety and Human Factors; Vehicles and Equipment; I94: Vehicle Corrosion; I95: Vehicle Inspection;

Filing Info

• Accession Number: 00159847
• Record Type: Publication
• Source Agency: Bundesanstalt für Straßenwesen (BASt)
• ISBN: 3181202517
• Report/Paper Numbers: Monograph
• Files: ITRD, TRIS
• Created Date: Feb 16 1978 12:00AM