Page 25 - TBIS_79010-2019_(EN)_1nd

TBIS 79010:2019

s and 1,0 s after the commencement of braking, start the measurement when the
operating force is fully applied.

2) Testing under wet conditions

The method shall be as given in 4.2.2.9.3.6 c) 1) with the addition that wetting of the
brake system shall commence not less than 5,0 s before the commencement of
braking and shall continue until the measurement period has ended.

Water nozzles shall be arranged according to Figure 8.

d) Correction of braking force

Each recorded braking force, F Br rec, shall be corrected for any difference between the
recorded operating force and the intended operating force. The corrected braking

force shall be calculated by multiplying the recorded braking force, F Br rec, with a
correction factor which is the ratio between the intended operating force, F Op intend,
and the recorded operating force, F Br rec.

EXAMPLE

Recorded braking force F Br rec = 225 N
Intended operating force F Op intend = 180 N
Recorded operating force F Op rec = 184 N

Correction factor = 180/184
Corrected braking force F Br corr = 225 × (180/184)

e) Test results

Select from the record the maximum output braking force, F Br max, for each

combination of wheel (front or rear) and each test condition (wet or dry).
The braking performance value shall be calculated using the following equation:

where
B p is the braking performance value（N）；
F Br max is the maximum F Br average（N）；
m is the reference mass as 100 kg for adult bicycle;
M is the maximum permissible total mass specified by the manufacturer if in excess of 100
kg
Where a manufacturer specifies that his CARGO BIKE can carry a mass such that the sum of
that mass plus the mass of CARGO BIKE is in excess of 100 kg, to some value M, apply M as
total weight.

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