BS EN ISO 4210-4:2014 pdf download

BS EN ISO 4210-4:2014 pdf download.Cycles — Safety requirements for bicycles Part 4: Braking test methods (Iso4210-4:2014).
4.3 Brake-block and brake-pad assemblies — Security test
Conduct the test on a fully assembled bicycle with the brakes adjusted to a correct position with a rider or equivalent mass on the saddle. The combined mass of the bicycle and rider (or equivalent mass) shall be 100 kg.
Actuate each brake lever with a force of 10 N applied at the point specified in Figure 5 or a force sufficient to bring the brake lever into contact with the handlebar grip, whichever is lesser. Maintain this force while subjecting the bicycle to five forward and five rearward movements, each of which is not less than 7S mm distance.
Then conduct the test described in 4A or 4.5 as appropriate, depending on the style of brake, and then the test described in 4.
4.4 Hand-operated braking-system — Strength Lest
Conduct the test on a fully assembled bicycle. After it has been ensured that the braking system is adjusted according to the recommendations in the manufacturer’s instructions, apply a force to the brake lever at the point specified in FienreS. This force shall be 450 N. or such lesser force as is required to bring
a) a brake lever into contact with the handlebar grip or the handlebar where the manufacturer dues not fit a grip,
b) a brake extension lever level with the surface of the handlebar or In contact with the handlebar, and c) a secondary brake lever to the end of its travel.
Repeat the test 10 times on each brake lever, secondary brake lever, or extension lever.
4.5 Back-pedal braking system — Strength test
Conduct the test on a fully assembled bicycle. After it has been ensured that the braking system Is correctly adjusted, and with the pedal cranks in a horizontal position, as shown in Figure 6. apply a vertically downward force to the centre of the left-hand pedal spindle.
4.6.3 Track Lest method
4.6.3.1 Test track
a) Use an Indoor test track If possible. If an outdoor test track Is used, pay special attention to ambient conditions throughout the test.
b) The gradient of the track shall not exceed 0,5 %. lithe gradient is less than 0,2% carry out all runs in the same direction, lithe gradient lies between 0,2 % and 0,5 %. carry out alternate runs in opposite directions.
c) The surface shall be hard, ofconcrete orfine asphalt, and free from loose dirt orgravel.The minimum coefficient of friction between the dry surface and the bicycle tyre shall be 0.75.
d) The track shall be essentially dry at the commencement of tests. When testing to the requirements of 4.6.3.6. the track shall remain dry throughout the tests.
e) The wind speed on the track shall not exceed 3 m/s during the tests.
4.6.3.2 Instrumentation
The test bicycle or the test track shall be instrumented to include the following:
a) a calibrated speedometer or tachometer (accurate to within ±5 %) to Indicate to the rider the approximate speed at the commencement of braking
b) a velocity-recording device (accurate to within ±2 %) to record the velocity at the commencement of braking:
c) a distance recording system (accurate to within ±1 %) to record the braking distance;
d) a water spray system, to provide wetting of the braking surface, consisting of a water reservoir connected by tubing to a pair of nozzles at the front wheel and a pair of nozzles at the rear wheel. A quick-acting on/off valve shall be included for control by the rider. Each nozzle shall provide a flow olwatcr at ambient temperature of not less than 4 mI/s. Details of the positions and directions of nozzles for rim brakes, hub brakes, band brakes, disc brakes, and backpedal brake are given in Eigur1 to U.
NOTE Figures land for rim brakes show side-pull callipers but the same arrangements apply to centre- pull callipers and cantilever brakes.
e) a brake-actuation indicating system to record independently when each lever or pedal is actuated.
4.6.3.3 Mass of bicycle, rider, and instrumentation
The combined mass of the bicycle, the rider, and the instrumentation shall be 100 kg.
When wet condition braking tests are performed, the combined mass can decrease throughout the test due to water consumption, but it shall not be less than 99 kg at the end of the valid test runs.
Where a manufacturer specifies that their bicycle can carry a mass such that the sum of that mass plus the mass of the bicycle is in excess of 100 kg (60 kg for young adults) to some value M, apply M as total weight.
Any extra weight shall be positioned above the rear wheel and in front of the rear axle.
4.6.3.4 Force applied to the brake levers
a) Magnitude and position of force on brake levers.