Changes

[https://fixme.ch/wiki/Normes_et_homologations_du_Long_Andr%C3%A9#ISO_4210_-_Exigences_de_sPartie_4:_M.C3.A9curitA9thodes_d.C3.A9_des_bicyclettes 27essai_de_freinage '''ISO 4210-4''']

4.6 Braking performance 4.6.1 Test bicycle 4.6.2 Secondary brake levers 4.6.3 Track test method  4.6.3.1 Test track 4.6.3.2 Instrumentation 4.6.3.3 Mass of bicycle, rider, and instrumentation 4.6.3.4 Force applied to the brake levers 4.6.3.5 Running — in the braking surfaces 4.6.3.6 Test method — Test runs under dry conditions 4.6.3.7 Test method — Test runs under wet conditions 4.6.3.8 Number of valid test runs 4.6.3.9 Velocity/distance correction factor 4.6.3.10 Validity of test runs 4.6.3.11 Test results 4.6.4 Back-pedal brake linearity test 4.6.5 Machine test method  4.6.5.1 General 4.6.5.2 Symbols 4.6.5.3 Linearity 4.6.5.4 Test machine 4.6.5.5 Instrumentation 4.6.5.6 Vertical force on the tested wheel 4.6.5.7 Test method a) General b) Running-in the braking surfaces c) The performance tests 1) Testing under dry conditions 2) Testing under wet conditions d) Correction of braking force e) Test results f) Linearity g) Ratio between wet and dry braking for city and trekking, young adult, and mountain bicycles h) Simple track test (see ISO 4210-2:2014, 4.19) 4.7 Brakes — Heat-resistance test Annex A (informative) - Explanation of the method of least squares for obtaining the line of best fit and ±20 % limit lines for braking performance linearity