Page 38 - TBIS_15194-2019_(EN)_3nd

TBIS 15194:2019

4.3.5.9.3 Linearity requirements

When tested by the methods described in 4.3.5.9.5.6 c) 1) and 2), the braking force
FBr average shall be linearly proportional (within ± 20 %) to the progressively
increasing intended operating forces FOp intend. The requirement applies to braking

forces FBr average equal to and greater than 80 N (see Annex F).
4.3.5.9.4 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 5:10.

The methods for calculating this ratio are given in 4.3.5.9.5.6 g).

4.3.5.9.5 Test method

4.3.5.9.5.1 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.

4.3.5.9.5.2 Symbols
F 0p
Operating force (i.e. force applied on brake-lever or pedal)
F 0p intend Intended operating force (e.g. 40 N, 60 N, 80 N etc.)
F 0p rec Recorded operating force (e.g. 38 N, 61 N, 79 N etc.)

F Br
Braking force
F Br rec
Recorded braking force
F Br corr
Corrected braking force (Corrected for difference between FOp intend
and FOp rec)
F Br average
The arithmetic mean of the three FBr corr at one level of FOp intend
F Br max
The maximum FBr average
D
F Br
Dry braking-force
W
F Br
Wet braking-force

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