ISO INTERNATIONAL STANDARD 7634 Third edition 2007-06-01 Road vehicles Compressed air braking systems for towed vehicles including those with electronic braking control functions Test procedures Vehicules routiers - Dispositifs de freinage a air comprime pour vehicules remorqués, y compris ceux avec fonctions de commande de freinage électroniques Modes opératoires d'essai Reference number ISO 7634:2007(E) @ ISO 2007 py IHS under ted without license from IHS Not for Resale ISO 7634:2007(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The isO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below COPYRIGHTPROTECTEDDOCUMENT @ISO2007 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, IsO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ ISo 2007 - All rights reserved ed without license from IHS Not for Resale ISO 7634:2007(E) Contents Page Foreword. 1 Scope 2 Normative references 3 Terms and definitions.... 4 Symbols 5 Test site conditions 5.1 Test site .. 5.2 Road surface condition.. 5.3 Ambient conditions ...... 6 General requirements. 8 7 Recommended sequence of tests... 7.1 Preparation and static checks and tests ... 9 7.2 Basic performance tests - unladen ... 10 7.3 Antilock braking system/electronically controlled braking system (ABS/EBS) tests unladen ............. 7.4 Basic performance tests Laden. 10 8 Vehicle preparation.... 11 8.1 Documents and basic data .... 11 8.2 11 8.3 Adjustment of braking equipment .... 11 8.4 Tyre conditions .... 8.5 Towing vehicles ...... 12 8.6 Instrumentation - .General.... 12 8.7 Provision for failure simulation.. 12 8.8 Loading condition... 13 8.9 Additional vehicle to tow the combination of normal towing vehicle and test trailer.. 13 8.10 Additional instrumentation for ABS equipped trailers ..... 13 8.11 Additional instrumentation for trailer with an electric control line 13 9 Energy storage capacity test... 14 9.1 Test conditions .... 14 9.2 Test procedure .... 14 9.3 Test requirement. 14 9.4 Presentation of results .. 14 10 Service braking system - - Response time measurement. .14 10.1 14 10.2 Towing venicie simuiator..... 10.3 Test conditions .... 15 10.4 Test procedure.. 15 10.5 Presentation of results .. 16 11 Automatic braking . 16 12 16 12.1 Antilock braking system warning signal.... 16 12.2 EBS warning signal check.. 16 13 Tests on trailers equipped with spring brake actuators. .16 13.1 Initial conditions ... 16 13.2 Energy depletion test .... 17 CopyrightInternational Oganzaonsandardizaloghtsreserved ili ut license from IHS Not for Resale ISO 7634:2007(E) 13.3 Spring brake actuation test... 13.4 Auxiliary release system check 14 Dynamometer tests (alternative to vehicle tests) . .17 14.1 General.. 17 14.2 Alternative type I tests (fade test for trailers of categories O2 and O3). 17 14.3 Alternative type Ill tests (fade test for category O4 trailers). 15 Transfer of results of type I or type Ill tests to other vehicles 21 15.1 General..... 15.2 Presentation