Division 5.4

In the case of hydraulic-transmission inertia braking systems, the following shall be determined:

1. 5.4.1.

   The reduction ratio i_h measured at the mid-travel position of the control device;

2. 5.4.2.

   The master cylinder output pressure p as a function of the thrust D on the drawbar and of the surface area F_HZ of the master-cylinder piston, as specified by the manufacturer; the supplementary force K and the efficiency are derived from the representative curve obtained from these measurements

   $${\eta }_{\mathrm{H0}}=\frac{1}{i_h}\times \frac{p\times F_{\mathrm{Hz}}}{D-K}$$

   (see Figure 3 of Appendix 1);

3. 5.4.3.

   The spare travel of the master cylinder s″, as referred to in point 2.2.19;

4. 5.4.4.

   Surface area F_HZ of the piston in the master cylinder;

5. 5.4.5.

   Stroke s_Hz of the master cylinder (in millimetres);

6. 5.4.6.

   Spare travel s″_Hz of the master cylinder (in millimetres).