Document ID: chunk:federal_register_of_legislation:F2006L03061:body:0:p16
Version: federal_register_of_legislation:F2006L03061
Segment Type: other
Provision Reference: 
Character Range: 44598–47358

force. The complete test procedure requires seven stops to be made, each from the specified initial temperature, with the first run pressure being 138 kPa and increasing an additional 69 kPa for each of the remaining stops.

38.3.9.2.                    If a comparison of 'ERC' determined under clause 38.3.9.1 is to be made with that obtained under the road test described in clause 38.3.3 of this Rule, due allowance must be made for the effect that test speed may have on the result. A direct comparison of dynamometer data from an initial speed of 60 km/h or that derived by interpolating between a high and lower speed is acceptable.

38.3.10.                      Service Brake Fade Performance Dynamometer Test

38.3.10.1.                When mounted on an inertia dynamometer, each brake shall be capable of making 10 consecutive decelerations at an average rate of 2.75 m/s from 80 km/h to 24 km/h at equal intervals of 72 seconds, and shall be capable of decelerating to a stop from 32 km/h at an average deceleration rate of 4.25 m/s2 one minute after the 10th deceleration. The series of decelerations shall be conducted as follows.

38.3.10.1.1.          With an initial brake temperature between 65 and 95 ° Celsius for the first brake application, and the drum or disc rotating at a speed equivalent to 80 km/h, apply the brake and decelerate at an average deceleration rate of 2.75 m/s2 to 24 km/h. Upon reaching 24 km/h accelerate to 80 km/h and apply the brake for a second time 72 seconds after the start of the first application. Repeat the cycle until 10 decelerations have been made.
 The service line air pressure shall not exceed 690 kPa during any deceleration.

38.3.10.1.2.          One minute after the end of the last deceleration required by clause 38.3.10.1.1 and with the drum or disc rotating at a speed of 32 km/h decelerate to a stop at an average deceleration rate of 4.25 m/s2.

38.3.10.2.                Starting 2 minutes after completing the tests required by clause 38.3.10.1 the brake shall be capable of making 20 consecutive stops from 48 km/h at an average deceleration rate of 3.65 m/s2 at equal intervals of one minute measured from the start of each brake application. The service line air pressure needed to attain a rate of  3.65 m/s2 shall be not more than 586 kPa and not less than 137 kPa for a brake not subject to the control of an 'Antilock System', or 82 kPa for a brake subject to the control of an 'Antilock System'.

38.3.11.                      Time Response Measurement

38.3.11.1.                Except where hydraulic brakes are used, each 'Unique' trailer 'Brake System' shall be shown to meet the requirements of clause 38.2.2.3 (actuation time) and clause 38.2.2.4 (release time) by