EN 14766:2005 - 64_e_stf - Baltik vairas

EN 14766:2005 (E)IV) Correction of braking forceEach recorded braking force, F Br rec , shall be corrected for any difference between the recorded operating force andthe intended operating force. The corrected braking force shall be calculated by multiplying the recorded brakingforce, F Br rec , with a correction factor which is the ratio between the intended operating force, F Op intend , and therecorded operating force, F Br rec .EXAMPLERecorded braking force F Br recIntended operating force F Op intendRecorded operating force F Op rec= 225 N= 180 N= 184 NCorrection factor = 180/184Corrected braking force F Br corr = 225 x (180/184)V) Test resultsSelect from the record the maximum output braking force, F Br max , for each combination of wheel (front or rear) andeach test condition (wet or dry).Calculate the average braking force F Br average as the arithmetic mean of three corrected brake force measurementsF Br corr .Calculate the braking distance, D, for each combination with the following equation:whereD = (K/F Br max ) + CDF Br maxKCis the calculated braking distance (m);is the maximum F Br average (N);is the braking specific test constant (Nm);is the delay specific test constant (m).Values for the constants are given in Table 2.Where a manufacturer specifies that his bicycle can carry a mass such that the sum of that mass plus the mass ofthe bicycle is in excess of 100 kg to some value M, increase the factors K in the ratio M/100.Table 2 — Constants for calculation of braking distances, D, from braking forces, F BrCondition Brake in use Constant, K Constant, CDry Front only 1 955 1,40Rear only 2 408 1,40Wet Front only 605 2,25Rear only 980 3,0032