Document ID: chunk:federal_register_of_legislation:F2017L01554:body:0:p32
Version: federal_register_of_legislation:F2017L01554
Segment Type: other
Provision Reference: 
Character Range: 95285–98450

V + 0.0087 V2                                   ≥  4.4 m/s2
L4                           S ≤  0.1 V + 0.0105 V2                                   ≥  3.6 m/s2
L5 and L7                    S ≤  0.1 V + 0.0117 V2                                   ≥  3.3 m/s2
Rear wheel(s) braking only
L1                           S ≤  0.1 V + 0.0143 V2                                   ≥  2.7 m/s2
L2 and L6                    S ≤  0.1 V + 0.0143 V2                                   ≥  2.7 m/s2
L3                           S ≤  0.1 V + 0.0133 V2                                   ≥  2.9 m/s2
L4                           S ≤  0.1 V + 0.0105 V2                                   ≥  3.6 m/s2
L5 and L7                    S ≤  0.1 V + 0.0117 V2                                   ≥  3.3 m/s2

Annex 3 - Appendix 1

ALTERNATIVE METHOD FOR THE DETERMINATION OF
PEAK BRAKING COEFFICIENT (PBC)
(see paragraph 1.1.3. to this annex)

     1.1. General:

          (a) The test is to establish a PBC for the vehicle type when being braked on the test surfaces described in Annex 3, paragraphs 1.1.1. and 1.1.2..

          (b) The test comprises a number of stops with varying brake control forces.  Both wheels shall be braked simultaneously up to the point reached before wheel lock, in order to achieve the maximum vehicle deceleration rate on the given test surface.

          (c) The maximum vehicle deceleration rate is the highest value recorded during all the test stops.

          (d) The Peak Braking Coefficient (PBC) is calculated from the test stop that generates the maximum vehicle deceleration rate, as follows:

            where:

               t = time taken for the vehicle speed to reduce from 40 km/h to 20 km/h in seconds.

          Note: For vehicles unable to achieve a test speed of 50 km/h, PBC shall be measured as follows:

            where:

               t = time taken, in seconds, for the speed of the vehicle to reduce from 0.8 Vmax to (0.8 Vmax - 20), where Vmax is measured in km/h.

          (e) The value of PBC shall be rounded to two decimal places.

         1.2. Vehicle condition:

          (a) The test is applicable to all vehicle categories.

          (b) The anti-lock system shall be either disconnected or inoperative (ABS function disabled), between 40 km/h and 20 km/h.

          (c) Lightly loaded.

          (d) Engine disconnected.

         1.3. Test conditions and procedure:

          (a) Initial brake temperature: ≥  55 °C and ≤  100 °C.

          (b) Test speed: 60 km/h or 0.9 Vmax, whichever is lower.

          (c) Brake application:

          Simultaneous actuation of both service brake system controls, if so equipped, or of the single service brake system control in the case of a service brake system that operates on all wheels.

          For vehicles equipped with a single service brake system control, it may be necessary to modify the brake system if one of the wheels is not approaching maximum deceleration.

          (d) Brake actuation force:

          The control force that achieves the maximum vehicle deceleration rate as defined in paragraph 1.1.(c).

          The application of