CSA D313:M85 (R2022)

Preface This is the second edition of CSA Standard D313, Trailer Running Gear.  It is written in SI (metric) units. It supersedes the previous edition published in 1979. It was prepared at the request of the Federal and Provincial authorities responsible for administering regulations pertaining to safety of vehicles on highways. The purpose of this Standard is to ensure safe operation of trailers under normal and emergency conditions, especially as regards braking performance. The ever increasing use of all types of trailers, particularly the recreational vehicle type, at high speeds demands that running gear be of good quality and that its performance capabilities be checked by adequate testing. This Standard is intended as a guide for manufacturers in the development and manufacture of running gear. It will also assist authorities having jurisdiction in the preparation of suitable safety legislation. The problem of transporting mobile homes has been given special attention. Provision has been made for the use of "limited use" running gear intended for transporting a mobile home from the place of manufacture to its destination and for use during the occasional relocation of that particular mobile home. The performance requirements for this type of running gear are not as stringent as those for the reusable type. This Standard is not intended for trailers that will be used predominantly for agricultural purposes, nor for the heavy commercial trailers. In regard to the latter, it was determined that the most convenient way to express this limitation in the Standard was to exclude trailers with full air-brake systems. This Standard was prepared by the Technical Committee on Trailer Running Gear under the jurisdiction of the Standards Steering Committee on Automotive Safety and was formally approved by these Committees. It has been approved as a National Standard of Canada by the Standards Council of Canada. Scope 1.1 This Standard provides a testing procedure for defining a minimum level of structural adequacy and performance capability for running gear used under trailers, sectional homes, and mobile homes, but excludes trailers equipped with full air brakes or vehicles not required to be licensed for highway use. 1.2 This Standard covers general requirements and performance tests for axles, suspension systems, tires and wheels, and brakes. Identification and marking of components and the assembly are also covered. 1.3 The values given in SI (metric) units are to be considered the standard. The values given in parentheses are for information only.