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Council Directive 93/14/EEC (repealed)Show full title

Council Directive 93/14/EEC of 5 April 1993 on the braking of two or three-wheel motor vehicles (repealed)

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1.DETERMINATION OF THE COEFFICIENT OF ADHESION (K)
1.1.The coefficient of adhesion is determined from the maximum braking rate, without wheel lock, of the vehicle with the anti-lock device(s) disconnected and braking all wheels simultaneously(1).
1.2.The braking tests are carried out by applying the brakes at an initial speed of 60 km/h (or, in the case of vehicles which are unable to reach 60 km/h, a speed of roughly 0,9 Vmax), the vehicle being unladen (apart from the test instruments and/or the necessary safety equipment). The effort exerted on the brake control must be constant throughout the tests.
1.3.A series of tests may be carried out up to the critical point reached immediately before the wheel(s) lock by varying both the front and the rear brake forces, in order to determine the maximum braking rate of the vehicle(2).
1.4.The braking rate (Z) shall be determined by reference to the time taken for the speed of the vehicle to reduce from 40 km/h to 20 km/h, using the formula

where t is measured in seconds.

Alternatively, for vehicles unable to attain 50 km/h, the braking rate is determined by reference to the time taken for the speed of the vehicle to reduce from 0,8 Vmax to 0,8 Vmax – 20 where Vmax is measured in km/h.

The maximum value of Z = K.

(1)

Additional requirements may have to be established in the case of vehicles equipped with combined braking systems.

(2)

As an initial step, to facilitate these preliminary tests, the maximum control force applied before the critical point may be obtained for each individual wheel.

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