{
  "url": "https://openlegislation.uk/eu-regulation-2015-68/annex-VIII/division-2/division-2.4",
  "json_url": "https://openlegislation.uk/eu-regulation-2015-68/annex-VIII/division-2/division-2.4.json",
  "legislation": "eur/2015/68",
  "legislation_title": "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)",
  "legislation_url": "https://openlegislation.uk/eu-regulation-2015-68",
  "path": "annex/VIII/division/2/division/2.4",
  "kind": "division",
  "number": "2.4",
  "heading": "Symbols valid for hydraulic-transmission braking systems (see Figure 8 of Appendix 1)",
  "text": "2.4.1. ih reduction ratio between travel of coupling head and travel of piston in master cylinder;\n2.4.2. i′g reduction ratio between travel of cylinder thrust point and lift (application travel) of brake-shoe centre;\n2.4.3. FRZ surface area of piston of one wheel cylinder for drum brake(s); for disc brake(s), sum of the surface area of the caliper piston(s) on one side of the disc;\n2.4.4. FHZ surface area of piston in master cylinder;\n2.4.5. p hydraulic pressure in brake cylinder;\n2.4.6. po retraction pressure in the brake cylinder when the towed vehicle moves forward; i.e., in graph of M = f(p), the value of the pressure p at the point of intersection of the extrapolation of this function with the abscissa (see Figure 7 of Appendix 1);\n2.4.6.1. por brake retraction pressure when the towed vehicle moves rearward (see Figure 7 of Appendix 1 );\n2.4.7. p* hydraulic pressure in the brake cylinder to produce the braking force B*;\n2.4.8. pT test pressure according to point 6.2.1:\n2.4.9. ρ′ characteristic of the brake when the towed vehicle moves forward as defined from:\nM = ρ′ (p – po)\n2.4.9.1. ρ′r characteristic of the brake when the towed vehicle moves rearward as defined from:\nMr = ρ′r (pr – por)",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eur/2015/68/annex/VIII/division/2/division/2.4",
    "retrieved_at": "2026-11-01T14:46:56.586941+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}