Page 18 - TBIS_79010-2019_(EN)_1nd
P. 18
TBIS 79010:2019
Repeat the test for a total of 10 times on each brake-lever, secondary brake lever or
extension lever.
4.2.2.8 Back-pedal braking system – Strength test
4.2.2.8.1 General
If the back-pedal braking system is fitted, the brake shall be actuated by the
operator's foot applying force to the pedal in a direction opposite to that of the drive
force. The brake mechanism shall function regardless of any drive-gear positions or
adjustments. The differential between the drive and brake positions of the crank
shall not exceed 60°.
The measurement shall be taken with the crank held against each position with a
pedal force of at least 250 N. The force shall be maintained for 1 min in each
position.
4.2.2.8.2 Requirement
When tested in accordance with 4.2.2.8.3, there shall be no failure of the brake
system or any component thereof.
4.2.2.8.3 Test method
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 5, apply a vertically-downward force to the centre of the
left-hand pedal spindle. Increase the force progressively to 1,500 N and maintain
fully for 1 min.
Page 14 for 43
