Page 20 - TBIS_79010-2019_(EN)_1nd
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TBIS 79010:2019
operation of the secondary brake-levers in addition to tests with the normal levers.
When tested in accordance with 4.2.2.9.3, the bicycle shall fulfil the requirements
shown in Table 1.
Table 1 — Calculated braking performance value
Condition Brake in use Requirement of F Br N
Front only 425
Dry
Rear only 280
Front only 220
Wet
Rear only 140
NOTE These values are based on the reference mass ”m“ (100 kg).
4.2.2.9.2.1 Linearity requirements
When tested by the methods described in 4.2.2.9.3.6 c) 1) and 2), the braking force
F Br average shall be linearly proportional (within ± 20 %) to the progressively increasing
intended operating forces F Op intend. The requirement applies to braking forces F Br
average equal to and greater than 80 N (see Annex A).
4.2.2.9.2.2 Ratio between wet and dry braking performance requirements
In order to ensure safety for both wet and dry braking, the ratio of braking
performance wet:dry shall be greater than 4:10.
The methods for calculating this ratio are given in 4.2.2.9.3.6 g).
4.2.2.9.3 Test method
4.2.2.9.3.1 General
The test machine enables the braking distances or deceleration for both brakes or
the rear brake alone to be calculated from measurements of the individual braking
forces of the front and rear brakes on a drum or belt.
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