Document ID: chunk:federal_register_of_legislation:F2010C00150:front:0:p26
Version: federal_register_of_legislation:F2010C00150
Segment Type: other
Provision Reference: 
Character Range: 70785–73764

to the maximum mass declared by the motor vehicle manufacturer. However, the minimum combination performance shall be not less than 5.4m/s2 both in laden and unladen conditions.

          The combination performance shall be verified by calculations referring to the maximum braking performance actually achieved by the motor vehicle alone (laden) during the Type-0 test with the engine disconnected, using the following formula (no practical tests with a coupled unbraked trailer are required):

 where :
          dM + R = calculated mean fully developed deceleration of the motor vehicle when coupled to an unbraked trailer, in m/s2
          dM = maximum mean fully developed deceleration of the motor vehicle alone achieved during the Type-0 test with engine disconnected, in m/s2
 PM = mass of the motor vehicle (laden)
          PR = maximum mass of an unbraked trailer which may be coupled, as declared by the motor vehicle manufacturer.

2.2. Secondary braking system

         2.2.1. The performance of the secondary braking system shall be tested by the Type-0 test with the engine disconnected from an initial vehicle speed of 100km/h and a force applied to the service brake control not less than 6.5daN and not exceeding 50daN.

         2.2.2. The secondary braking system must give a stopping distance not exceeding the following value:

0.1v + 0.0158v2 (m)

          and a mean fully developed deceleration not less than 2.44m/s2 (corresponding to the second term of the above formula).

         2.2.3. The secondary braking effectiveness test shall be conducted by simulating the actual failure conditions in the service braking system.

         2.2.4. For the electric vehicles, the performances for two following additional failures will be checked:

    2.2.4.1.  For a total failure of the electric component of the service brake;

         2.2.4.2.  In the case where the electric component delivers the maximum braking force where a failure of the electric transmission occurs.

2.3. Parking braking system

         2.3.1. The parking braking system must be capable of holding the laden vehicle stationary on a 20% up or down gradient.

         2.3.2. On vehicles to which the coupling of a trailer is authorized, the parking braking system of the motor vehicle must be capable of holding the combination of vehicles stationary on a 12% up or down gradient.

         2.3.3. If the control device is manual, the force applied to it must not exceed 40daN.

         2.3.4. If it is a foot control device, the force exerted on the control must not exceed 50daN.

         2.3.5. A parking braking system which has to be actuated several times before it attains the prescribed performance is admissible,

         2.3.6. To check compliance with the requirement specified in paragraph 5.2.2.4. of this Regulation, a Type-0 test must be carried out, with the engine disconnected, at an initial test speed of 30km/h. The mean fully developed deceleration