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Commission Delegated Regulation (EU) 2015/68Show full 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)
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- Revised 09/06/20182.16 MB
- Revised 14/10/20162.17 MB
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4. Requirements for towed vehicles
4.1.For drawbar towed vehicles fitted with compressed-air and hydraulic braking systems:
4.1.1.
For drawbar towed vehicles with two axles the following requirements apply:
4.1.1.1.
For k values between 0,2 and 0,8:
z ≥ 0,1 + 0,85 (k – 0,2)
The provisions of point 3.1.1. do not affect the requirements of Annex II relating to the braking performance. However, if, in tests made under the provisions of point 3.1.1, braking performances are obtained which are higher than those prescribed in Annex II, the provisions relating to the adhesion utilisation curves shall be applied within the areas of diagrams 1 of this Annex defined by the straight lines k = 0,8 and z = 0,8.
4.1.1.2.
For all states of load of the vehicle, the adhesion utilisation curve of the rear axle shall not be situated above that for the front axle for all braking rates between 0,15 and 0,30. This condition is also considered satisfied if, for braking rates between 0,15 and 0,30, the following two conditions are satisfied:
4.1.1.2.1.
the adhesion utilisation curves for each axle are situated between two lines parallel to the line of ideal adhesion utilisation given by the equations k = z + 0,08 and k = z – 0,08 as shown in diagram 1
and
4.1.1.2.2.
the adhesion utilisation curve for the rear axle for braking rates z ≥ 0,3 complies with the relation z ≥ 0,3 + 0,74 (k – 0,38).
4.1.1.3.
For the verification of the requirements of points 4.1.1.1 and 4.1.1.2 the procedure should be as that in the provisions of point 3.1.5.
4.1.2.
For drawbar towed vehicles with more than two axles the requirements of point 4.1.1 shall apply. The requirements of point 4.1.1 with respect to wheel lock sequence shall be considered to be met if, in the case of braking rates between 0,15 and 0,30, the adhesion utilised by at least one of the front axles is greater than that utilised by at least one of the rear axles.
4.1.3.
The permissible relationship between the braking rate TR/FR and the pressure pm shall lie within the designated areas in diagram 3 for all pressures between 20 and 750 kPa (pneumatic) and 350 and 13 300 kPa (hydraulic) respectively, in both the laden and unladen states of load.
4.2.For rigid drawbar towed vehicles and centre-axle towed vehicles fitted with compressed-air and hydraulic braking systems:
4.2.1.
The permissible relationship between the braking rate TR/FR and the pressure pm shall lie within two areas derived from diagram 3, by multiplying the vertical scale by 0,95. This requirement shall be met at all pressures between 20 and 750 kPa (pneumatic) and 350 and 13 300 kPa (hydraulic) respectively, in both the laden and unladen states of load.
4.3.For drawbar towed vehicles with inertia braking system
4.3.1.The requirements according to point 4.1.1 apply also for drawbar towed vehicles with inertia braking system.
4.3.2.For drawbar towed vehicles with inertia braking system and with more than two axles the requirements according to point 4.1.2 of this Appendix apply.
4.3.3.For the calculation to verify the compliance with the provisions of point 4.1.1.3 the influence of the permissible drawbar force D* (point 10.3.1. of Annex VIII) can be ignored.
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