WP.29-156-10
Addendum to document WP.29/2012/4
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Date
9 Mar 2012
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Subject
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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).

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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
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