Document ID: chunk:federal_register_of_legislation:F2017L01554:body:0:p13
Version: federal_register_of_legislation:F2017L01554
Segment Type: other
Provision Reference: 
Character Range: 36382–39453

two successive steps or levels of actuation of a rotating knob, a touch panel switch or a menu option selector;

         (c)    Disabling of the antilock brake system function shall only be allowed when the riding mode selector is in the "off-road" or "all terrain" mode; and

         (d)    The antilock brake system function shall be automatically activated after each start-up of the vehicle, except for restarts after unintentional stalling of the engine; and

         (e)    The disablement of the antilock brake system function shall be indicated by the activation of symbol B.18 as specified in ISO 2575:2010/Amd1:2011 (ISO 7000-2623) or any other equivalent unequivocal indication of the disabled antilock brake system state. Alternatively the warning lamp referred to in paragraph 5.1.13. shall be continuously activated (i.e. lit or flashing); and

         (f)     Prohibition of any software and/or hardware defeat device compromising or allowing to circumnavigate one or more of the requirements set out in points (a) to (e); and

         (g)    Instantaneous re-enablement of a functional stage which complies with anti-lock brake system approval requirements of the antilock brake system under all operation modes shall be warranted and shall be demonstrated to the satisfaction of the certification authority (e.g. simple press of a button).

       5.2. Durability

       5.2.1 Wear of the brakes shall be compensated for by means of a system of automatic or manual adjustment.

       5.2.2. The friction material thickness shall either be visible without disassembly, or where the friction material is not visible, wear shall be assessed by means of a device designed for that purpose.

       5.2.3. During all the tests in this Regulation and on their completion, there shall be no friction material detachment and no leakage of brake fluid.

       5.3. Measurement of dynamic performance

        The method used to measure performance is as specified in the respective tests in Annex 3. There are three ways in which the service brake system performance may be measured:

       5.3.1. MFDD (Mean Fully Developed Deceleration):

        Calculation of MFDD:

         in m/s2

        where:
              dm = mean fully developed deceleration
              V1 = vehicle speed when rider actuates the control
              Vb = vehicle speed at 0.8 V1 in km/h
              Ve = vehicle speed at 0.1 V1 in km/h
              Sb = distance travelled between V1 and Vb in metres
              Se = distance travelled between V1 and Ve in metres

       5.3.2. Stopping distance:

        Based on the basic equations of motion:

         S = 0.1·V + (X) ·V2

        where:
         S = stopping distance in metres
         V = vehicle speed in km/h
         X = a variable based on the requirement for each test

        To calculate the corrected stopping distance using the actual vehicle test speed, the following formula is used:

         Ss = 0.1·Vs + (Sa – 0.1·Va) · Vs2/Va2

        where:
         Ss = corrected stopping distance