# Commission Delegated Regulation (EU) 2015/68 of 15 October 2014 supplementing Regulation (EU) No 167/2013 of the European Parliament and of the Council with regard to vehicle braking requirements for the approval of agricultural and forestry vehicles (Text with EEA relevance), Division 7.4

Extent: E+W+S+N.I.

In the case of hydraulic brakes, the following shall be determined:
7.4.1. Reduction ratio ig′ (see Figure 8 of Appendix 1)
7.4.2. Pressure p* for braking torque M*
7.4.3. Torque M* as a function of the pressure p* applied to the brake cylinder in hydraulic transmission systems.
The rotational speed of the braking surfaces shall correspond to an initial vehicle speed of 30 km/h in the case of Class C1 vehicle, 40 km/h in the case of Class C2 vehicle, 60 km/h in the case of Class C3 vehicle, when the towed vehicle moves forward and 6 km/h when the towed vehicle moves rearward. The following shall be derived from the curve obtained from these measurements (see Figure 7 of Appendix 1):
7.4.3.1. The retraction pressure po and the characteristic ρ′ when the towed vehicle moves forward;
7.4.3.2. The retraction pressure por and the characteristic ρ′r when the towed vehicle moves rearward;
7.4.3.3. Maximum braking torque Mr up to the maximum permissible fluid volume Vr when the towed vehicle moves rearward (see Figure 7 of Appendix 1);
7.4.3.4. Maximum permissible fluid volume Vr absorbed by one braking wheel when the towed vehicle moves rearward (see Figure 7 of Appendix 1).
7.4.4. Surface area FRZ of the piston in the brake cylinder.

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Source: https://www.legislation.gov.uk/eur/2015/68/annex/VIII/division/7/division/7.4 (the official version)
Page: https://openlegislation.uk/eu-regulation-2015-68/annex-VIII/division-7/division-7.4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.