WP.29/2012/4
Proposal for Supplement 1 to the 02 series of amendments to Regulation No. 90
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This proposal to establish a “bedding in” procedure was adopted at the March 2012 WP.29 session as amended by paragraph 64 of the session report. (Click the meeting link to access the report.)
64. Agenda item 4.7.2, UN Regulation No. 90, document ECE/TRANS/WP.29/2012/4,
Page 11, Annex 11, paragraph 4.2.2.2.2., amend to read:
“4.2.2.2.2. Test programme (brake drum high load test).
Table A11/4.2.2.2.2.
| Test provision | High load test |
| “Bedding in” procedure | 200 brake applications Initial speed: 60 km/h Final speed: 5 km/h dm alternating between 1 m/s2 and 2 m/s2 Initial temperature: ≤ 200 °C (beginning at room temperature) Alternatively bedding may be omitted if the applicant for approval does not consider it to be necessary |
| Type of braking | Braking to less than 5 km/h |
| Total number of brake applications | 150 |
| Initial brake drum temperature at each brake application | ≤ 100 °C |
| Brake applications from to | 60 km/h ≤ 5 km/h |
| Brake torque set to produce a deceleration of | 6 m/s² |
| Cooling (also deviating from paragraph 3.2.3. of this annex) | Permitted |
22. The expert from CLEPA presented GRRF-72-15, superseding ECE/TRANS/WP.29/GRRF/2012/3, on the “Bedding in” test procedure for brake drums. GRRF adopted the proposal as reproduced in Annex VI and requested the secretariat to submit it to WP.29 and AC.1, as a Corrigendum to ECE/TRANS/WP.29/2012/4, for consideration at their March 2012 sessions.
23. The expert from FEMFM introduced GRRF-72-05 superseding ECE/TRANS/WP.29/GRRF/2012/3 clarifying the meaning of “identical” brake linings.
Following the discussion, he presented, jointly with the expert from Spain, a revised proposal (GRRF-72-05-Rev.1).
GRRF supported the approach but noted some concerns and agreed to resume consideration of this subject at its next session. This will be on the basis of an official document to be prepared by FEMFM jointly with Spain, the Russian Federation and OICA.