Commission Delegated Regulation (EU) 2015/68Show full title

3.5. Test procedures

3.5.1. Supplementary cold performance test

The preparation of the brake shall be in accordance with point 3.5.1.1.

3.5.1.1. Bedding in (burnishing) procedure

3.5.1.1.1. In the case of drum brakes the tests shall start with new brake linings and new drum(s), the brake linings shall be machined to achieve the best possible initial contact between the linings and drum(s).

3.5.1.1.2. In the case of disc brakes the tests shall start with new brake pads and new disc(s), machining of the pad material shall be at the discretion of the brake manufacturer.

3.5.1.1.3. Make 20 brake applications from an initial speed of 60 km/h with an input to the brake theoretically equal to 0,3 TR/Test Mass. The initial temperature at the lining/drum or pad/disc interface shall not exceed 100 °C before each brake application.

3.5.1.1.4. Carry out 30 brake applications from 60 km/h to 30 km/h with an input to the brake equal to 0,3 TR/Test Mass and with a time interval between applications of 60 s. If the track test method or the rolling road test methods are to be utilised, energy inputs equivalent to those specified shall be used. The initial temperature at the lining/drum or pad/disc interface on the first brake application shall not exceed 100 °C.

3.5.1.1.5. On completion of the 30 brake applications specified in point 3.5.1.1.4 and after an interval of 120 s carry out 5 brake applications from 60 km/h to 30 km/h with an input to the brake equal to 0,3 TR/Test Mass and with an interval of 120 s between applications.

3.5.1.1.6. Make 20 brake applications from an initial speed of 60 km/h with an input to the brake equal to 0,3 TR/Test Mass. The initial temperature at the lining/drum or pad/disc interface shall not exceed 150 °C before each brake application.

3.5.1.1.7. Carry out a performance check as follows:

3.5.1.1.7.1.

Calculate the input torque to produce theoretical performance values equivalent to 0,2, 0,35 and 0,5 + 0,05 TR/Test Mass.

3.5.1.1.7.2.

Once the input torque value has been determined for each braking rate, this value shall remain constant throughout each and subsequent brake applications (e.g. constant pressure).

3.5.1.1.7.3.

Make a brake application with each of the input torques determined in point 3.5.1.1.7.1 from an initial speed of 60 km/h. The initial temperature at the lining/drum or pad/disc interfaces shall not exceed 100 °C before each application.

3.5.1.1.8. Repeat the procedures laid down in point 3.5.1.1.6 and 3.5.1.1.7.3, where point 3.5.1.1.6 is optional, until the performance of five consecutive non monotonic measurements at the 0,5 TR/(Test Mass) constant input value has stabilised within a tolerance of minus 10 per cent of the maximum value.

3.5.1.2. It is also permissible to carry out the two fade tests, Type-I and Type- III, one after the other.

3.5.1.3. This test is carried out at an initial speed equivalent to 40 km/h in the case of Type-I test and 60 km/h in the case of Type-III test in order to evaluate the hot braking performance at the end of Type-I and Type-III tests. The Type-I and/or Type-III fade test has/have to be done immediately after this cold performance test.

3.5.1.4. Three brake applications are made at the same pressure (p) and at an initial speed equivalent to 30 km/h and 40 km/h respectively (in the case of Type-I test, as determined in the test report) or 60 km/h (in the case of Type-III test), with an approximately equal initial brake temperature not exceeding 100 °C, measured at the outside surface of the drums or discs. The applications shall be at the brake actuator pressure required to give a brake torque or force equivalent to a braking rate (z) of at least 50 per cent. The brake actuator pressure shall not exceed 650 kPa (pneumatic) or 11 500 kPa (hydraulic), and the brake input torque (C) shall not exceed the maximum permissible brake input torque (C_max). The average of the three results shall be taken as the cold performance.

3.5.2. Fade test (Type-I test)

3.5.2.1. This test is carried out at a speed equivalent to 40 km/h with an initial brake temperature not exceeding 100 °C, measured at the outside surface of the drum or brake disc.

3.5.2.2. A braking rate is maintained at 7 per cent, including the rolling resistance (see point 3.2.4.).

3.5.2.3. The test is made during 2 minutes and 33 seconds or during 1,7 km at a vehicle speed of 40 km/h. In case of towed vehicles with v_max ≤ 30 km/h or if the test velocity cannot be achieved, then the duration of the test can be lengthened according to point 2.3.2.2 of Annex II.

3.5.2.4. Not later than 60 seconds after the end of the Type-I test, a hot performance test is carried out in accordance with point 2.3.3 of Annex II at an initial speed equivalent to 40 km/h. The brake actuator pressure shall be that used during the Type-0 test.

3.5.3. Fade test (Type-III test)

3.5.3.1. Test methods for repeated braking

3.5.3.1.1. Track tests (see Annex II, point 2.5)

3.5.3.1.2. Inertia dynamometer test

For the bench test described in point 3.2, the conditions may be the same as for the road test described in point 2.5.4 of Annex II with:

3.5.3.1.3. Rolling road dynamometer test

For the bench test described in point 3.3, the conditions shall be as follows:

Number of brake applications	20
Duration of braking cycle	60 s (braking time 25 s and recovery time 35 s)
Test speed	30 km/h
Braking rate	0,06
Rolling resistance	0,01

3.5.3.2. Not later than 60 seconds after the end of the Type-III test a hot performance test is carried out in accordance with point 2.5.5 of Annex II. The brake actuator pressure shall be that used during the Type-0 test.