25. The expert from CLEPA presented ECE/TRANS/WP.29/2016/22 based on GRRF-80-12 proposing amendments to provisions defined for equivalent brake discs and drums and a relaxation of the requirement on the thickness variation for interchangeable replacement discs or drums. The expert presented a revised proposal GRRF-81-04 limiting the thickness variation requirement modification to vehicles of category O2, O3, N3 and M3. The expert from Italy expressed his concern with the proposed requirement relaxation. After discussion, GRRF agreed on the revised document GRRF-81-04-Rev.1. GRRF adopted the proposal amended by Annex IV to the report and requested the secretariat to submit it to WP.29 and AC.1 for consideration at their June 2016 sessions, as Supplement 3 to the 02 series of amendments to Regulation No. 90.

26. The expert from CLEPA introduced GRRF-81-05-Rev.1 presenting the characteristics of Carbon – Ceramic brakes and proposing to introduce relevant provisions in the Regulation. After discussion, GRRF invited the expert from CLEPA to prepare an informal document proposing amendments to Regulation No. 90 that would include Carbon – Ceramics brakes for consideration at the next GRRF session.

27. The expert from FEMFM introduced GRRF-81-03 proposing a standard Conformity of Production (COP) form to be annexed to Regulation No. 90 that would specify the audit points checked by the Type Approval Authorities in the COP process. The expert from the Russian Federation explained that the proposal would be in contradiction to the provisions of the 1958 Agreement with regard to COP and that the proposal should be revised to be aligned to the provisions of the Agreement. GRRF didn’t oppose to the idea of streamlining the COP process but preferred that a transversal approach across the UN Regulations would be chosen. Therefore, GRRF invited the expert from FEMFM to present his proposal to the World Forum WP.29 or to the IWG on International Whole Vehicle Type Approval (IWVTA).

28. The secretariat introduced GRRF-81-27 containing the request for clarifications of paragraph 5.2.2.1.1 in Regulation No. 90. Only one minimum shear strength requirement is specified for brake shoe assemblies and one requirement for brake pad assemblies in Regulation No. 90 and it is therefore requested that clarification be provided if these requirements are for both cold and hot shear because ISO 6312 specifies methods for both cold and hot shear tests. GRRF confirmed that Regulation No. 90 requested that the test, according to the mentioned ISO standard, has to be run at ambient temperature only. Several experts noted that a general review of Regulation No. 90 would be useful in order to minimize interpretation issues. Following discussions, the expert from Spain prepared and presented ToR for a SIG of experts to explore whether the issues related to the interpretation of the Regulation were minor and could be managed by GRRF or whether they are significant and would require the establishment of a specific IWG. GRRF agreed with the proposal and endorsed GRRF-81-33.

29. The expert from Italy presented GRRF-81-29 introducing ECE/TRANS/WP.29/GRRF/2016/18. The experts from Spain, UK and EC expressed reservations with the aim of the proposal, taking into account the history of the Regulation No. 90 development. They suggested that a more strategic and coordinated approach was chosen to develop the Regulation. GRRF agreed that this proposal may be reviewed by a SIG dealing with Regulation No. 90.