COMMENTS ON THE BRITISH PROPOSAL ON BRAKE TESTING. TYPE 3

STELLUNGNAHME ZU DEM BRITISCHEN VORSCHLAG BREMSPRUEFUNG TYP III

THE DEPARTMENT OF THE ENVIRONMENT (DOE) PRESENTED A PROPOSAL FOR THE CONTINUOUS TESTING OF TRAILER BRAKES TO THE ECONOMIC COMMISSION FOR EUROPE - GROUP OF RAPPORTEURS ON BRAKING AT THEIR 24TH MEETING. THE OBJECT OF THE RESEARCH WAS TO COMPARE THE BRITISH PROPOSAL WITH THE SPECIFICATION ON BRAKING EQUIPMENT (RREG 71/320/EWG). CONTINUOUS BRAKING TESTS WERE CARRIED OUT IN ACCORDANCE WITH THE BRITISH PROPOSAL, THE SPECIFICATION AND A PROPOSAL MADE BY THE TECHNICAL SERVICE FOR BRAKING EQUIPMENT (TDB). MEASURED VALUES WERE OBTAINED FOR THE PRESSURE IN THE BRAKING CYLINDER, THE DECELERATION, THE TEMPERATURE IN THE BRAKE DRUM AND TOW-BAR FORCE. THE DISADVANTAGE OF THE BRITISH PROPOSAL IS THAT IT REQUIRES A LONG, LEVEL STRETCH OF ROAD. THE METHOD IS BASED ON BRAKING AT SET INTERVALS. IN PRACTICE HOWEVER CONSTANT SPEEDS ARE STRIVEN FOR ON GRADIENTS. SHORTCOMINGS IN THE BRITISH PROPOSAL LED TO THE TDB PROPOSAL.