Document ID: chunk:federal_register_of_legislation:F2006L03061:body:0:p10
Version: federal_register_of_legislation:F2006L03061
Segment Type: other
Provision Reference: 
Character Range: 28010–30936

Coefficient'. In the case of air 'Brake Systems' having service brake effectiveness specified as ARC, ERC may be determined by calculating K2 in the equation below.

where

S is stopping distance from initial movement of the 'Control' in metres.

V is the initial velocity, in km/h

K1 is a constant related to time delay where at a value of 0.09 is equal to a time delay of 0.32 second

K2 is a constant related to established retardation and at a value of 115 is equivalent to 0.45 g (4.4 m/s2).

38.3.1.3.3.              In the case of 'Brakes' friction materials, the substitute material would have to be identical in regard to its SAE J 866a - "Friction Identification System for Brake Linings and Brake Blocks for Motor Vehicles" (September 1966) and to meet or exceed the requirements of SAE J 840c - "Test Procedures for Brake Shoe and Lining Adhesives and Bonds" (May 1971), and SAE J 998 - "Minimum Requirements for Motor Vehicle Brake Linings" (January 1968), or other international standards.

38.3.1.3.4.              Submissions for compliance approval based in part on a previously approved trailer shall be in relation to an approval based on a complete submission of either test or calculation data.

38.3.2.                          General Test Conditions - Road Tests

38.3.2.1.                    The ambient temperature at the test site shall be greater than 0 and less than 40°C.

38.3.2.2.                    All road tests shall be conducted with tyres fitted of the size specified by the 'Manufacturer' as original equipment and shall be inflated to pressures not less than those recommended by the 'Manufacturer'.

38.3.2.3.                    Braking tests shall be carried out on approximately level surfaces. Where the levels are unsurveyed, the test shall be completed in both directions, the brakes being applied over the same section, and the two results averaged to determine the final result. Where the difference in start and finish elevations for a brake test, expressed as a percentage of the stopping distance, is shown, the brake test need only be completed in one direction and the result corrected for any difference in elevation exceeding 1 percent.

38.3.2.4.                    The wind speed difference between two tests in opposite directions, or against the direction of travel in the case of a single brake test, shall not exceed 15 km/h.

38.3.2.5.                    The towing vehicle used to facilitate the tests shall be of a type normally employed to tow the particular trailer under test and shall have enough power to attain the initial speed required for the specified braking tests.

38.3.2.6.                    All road tests shall be conducted with the trailer loaded to 'MLTM' and energy storage devices charged to 'Normal Minimum Energy Level', unless otherwise required by this Rule.

38.3.2.7.                    The test surface shall be either