1 2 3 4 5 6 7 8 9 10
Document Title Addendum to document WP.29/2012/4
Reference Number WP.29-156-10
Date
9 Mar 2012
Summary Submission of the Working Party on Brakes and Running Gear (GRRF) amending provisions concerning the brake drum "bedding in" procedures proposed in document WP.29/2012/4 (Proposal for Supplement 1 to the 02 series of amendments to Regulation No. 90).
Rulemaking Area(s) UN R90 Replacement Brake Components
Meeting(s)
Downloads
UNECE server .pdf format
Excerpts from session reports related to this document
WP.29 | Session 156 | 13-16 Mar 2012

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 provisionHigh 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 brakingBraking to less than 5 km/h
Total number of brake applications150
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 of6 m/s²
Cooling (also deviating from paragraph 3.2.3. of this annex)Permitted
New and Upcoming
System Pages
Regulations
Working Groups
GlobalAutoRegs
© 2025 GlobalAutoRegs