ISO INTERNATIONAL STANDARD 7635 Third edition 2006-06-01 Road vehicles Air and air/hydraulic braking systems of motor vehicles, including those with electronic control functions Test procedures Véhicules routiers Systemes de freinage a air comprimé ou hydropneumatiques pour les vehicules a moteur, y compris les systemes a fonctions de commande électroniques Methodes d'essai Reference number ISO 7635:2006(E) @ ISO 2006 by IHS under lic ted without license from IHS Not for Resale ISO 7635:2006(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 accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF fle 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. ?ISO2006 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 2006 - All rights reserved ted without licensefrom IHS Not for Resale ISO 7635:2006(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. 7 Recommended sequence of the tests 7.1 Preparation and static checks and tests .. 8 7.2 Basic performance tests Unladen ... 7.3 Failure tests -- Unladen.... 9 7.4 ABS tests Unladen.. 7.5 ABStestsLaden. 10 7.6 Failure tests Laden. 10 7.7 Basic performance tests Laden. 10 8 Vehicle preparation.... 11 8.1 Documentsandbasicdata.. 11 8.2 Braking system condition and bedding .. 8.3 Adjustment of braking equipment ..... 8.4 Tyre conditions..... 11 8.5 Devices and instruments needed for the testing .. 11 9 Static tests and checks .... 13 9.1 Static braking force and control force vs. line pressure .... 9.2 13 9.3 Service braking system - Response time measurement.... 14 9.4 Automatic braking . 15 9.5 Brake failure and defect warning signals. 15 9.6 Tests on vehicles equipped with spring brake actuators... 17 9.7 Additional tests on vehicles equipped with EBS .... 18 10 Basic performance tests - Unladen .. 10.1 Type 0 test (service braking system cold brake effectiveness, engine disconnected). 18 10.2 Type O test (service braking system cold brake, engine connected)..... 19 10.3 Parking braking system - Hili hoiding test ...... 10.4 Secondary braking system test..... 19 10.5 Wheel locking sequence .. 20 11 Failure tests Unladen..... 11.1 Service braking system partial failure test (type 0 test, cold brake effectiveness, engine disconnected).. 11.2 Failed load sensing device test/function test. 21 11.3 Failure of the energy source on vehicles equipped with EBs.... 21 12 ABStests -Unladen. 22 12.1 ABS failure... 12.2 Determination of the peak coefficient of adhesion on the high adhesion surface.... .23 Copyright IntemationalOorganizansadardizaloghtsreserved ili ut license from IHS Not for Resale ISO 7635:2006(E) 12.3 Determination of adhesion utilization on high adhesion surface ..... ..24 12.4 Determinationofadhesionutilizationonlowadhesionsurface. 26 12.5 Additional checks .... 26 13 ABS tests Laden .. 27 13.1 Additional split adhesion test..... 27 13.2 Energy consumption on low adhesion surface.. 14 Failure tests Laden.... 14.1 dis