Overview of special interest group discussions on replacement brake discs and drums, as well as on replacement brake pads and calipers (especially remanufactured).

Proposal to introduce provisions for the approval of replacement brake discs for L-category (motorcycle and related) vehicles, to remove tables specifying general values for replacement discs and drums that are identical to the original, change the maximum permitted thickness variation of discs for medium and heavy vehicles from 0.030 mm to 0.040 mm, and clarify the text in order to avoid additional administrative and financial costs to the applicant due to misinterpretation of the intent of the text.

Revised version of the proposal to remove tables specifying general values for replacement discs and drums that are identical to the original (2.3.3.4), taking into account comments received during the February 2016 GRRF session. The tables are considered superfluous since replacement parts identical to the original parts must by definition have values identical to the corresponding original parts. This proposal also would change the maximum permitted thickness variation of discs for medium and heavy vehicles from 0.030 mm to 0.040 mm (the common OEM specification). This has been changed from the previous proposal of 0.050 mm. This revised proposal clarifies that the proposal would revise the specifications for vehicles of categories M3, N3, O3 and O4 but retain the maximum permitted specification of 0.030mm for vehicles of categories M2 and N2.

Technical services have reported difficulties in interpreting the requirements and procedures incorporated in the 02 series of amendments to UN R90. Therefore, this submission proposes a special interest group to consider whether an informal working group may be needed to revised UN 92.02.

Presentation explaining the proposal to establish requirements for the approval of replacement brake lining assemblies for L-category vehicles.

UN R90 specifies one minimum shear strength requirement for brake shoe assemblies and one requirement for brake pad assemblies in Regulation No. 90 via a reference to ISO 6312. However, ISO 6312 specifies test methods for hot and cold shear tests. Therefore, GRRF is requested to clarify whether the strength requirements are for both hot and cold shear.

Updated version of the proposal to remove tables specifying general values for replacement discs and drums that are identical to the original (2.3.3.4) since such replacements must by definition have values identical to the corresponding original parts. The proposal also would change the maximum permitted thickness variation of discs for medium and heavy vehicles from 0.030 mm to 0.050 mm (the common OEM specification). This revised proposal clarifies that the proposal would revise the specifications for vehicles of categories M3, N3, O3 and O4 but retain the maximum permitted specification of 0.030mm for vehicles of categories M2 and N2.

Presentation highlighting the growing use of carbon-ceramic (CSiC) brake discs and the need to address these products under UN R90 given that the replacement discs regulation is founded upon conventional cast iron technologies.

Proposal to establish a uniform CoP inspection questionnaire to harmonize conformity of production administrative requirements across Contracting Parties under UN R90. The intent is to increase efficiency and lower costs due to the absence of mutual recognition of CoP certifications among approval authorities.