Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p35
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 94441–97359

anti-lock system

          A vehicle equipped with a category 1 anti-lock system shall meet all the requirements of this annex.

3.1.2. Category 2 anti-lock system

          A vehicle equipped with a category 2 anti-lock system shall meet all the requirements of this annex, except those of paragraph 5.3.5.

3.1.3. Category 3 anti-lock system

          A vehicle equipped with a category 3 anti-lock system shall meet all the requirements of this annex, except those of paragraphs 5.3.4. and 5.3.5. On such vehicles, any individual axle which does not include at least one directly controlled wheel must fulfil the conditions of adhesion utilization and the wheel-locking sequence of annex 5 to this Regulation, instead of the adhesion utilization requirements prescribed in paragraph 5.2. of this annex. However, if the relative positions of the adhesion utilization curves do not meet the requirements of paragraph 3.1. of annex 5 to this Regulation, a check shall be made to ensure that the wheels on at least one of the rear axles do not lock before those of the front axle or axles under the conditions prescribed in paragraph 3.1. of annex 5 to this Regulation, with regard to the braking rate and the load respectively.  These requirements may be checked on high- and low-adhesion road surfaces (about 0.8 and 0.3 maximum) by modulating the service braking control force.

4. GENERAL REQUIREMENTS

         4.1. Any electrical failure or sensor anomaly that affects the system with respect to the functional and performance requirements in this annex, including those in the supply of electricity, the external wiring to the controller(s), the controller(s) [2/]and the modulator(s) shall be signaled to the diver by a specific optional warning signal. The yellow warning signal specified in paragraph 5.2.21.1.2. of this Regulation shall be used for this purpose.

         4.1.1. The warning signal shall light up when the anti-lock system is energized and with the vehicle stationary it shall be verified that none of the above-mentioned defects are present before extinguishing the signal.

         4.1.2. The static sensor check may verify that a sensor was not functioning the last time that the vehicle was at a speed greater than 10km/h. [3/]Also during this verification phase, the electrically controlled pneumatic modulator valve(s) shall cycle at least once.

         4.1.3. The above-mentioned optical warning signal must be visible even in daylight and it must be easy for the driver to check that it is in working order.

         4.2. In the event of a single electrical functional failure which only affects the anti-lock function, as indicated by the above-mentioned yellow warning signal, the subsequent service braking performance must not be less than 80% of the prescribed performance according to the Type-0 test with the engine disconnected. This corresponds to a stopping distance