1、BRITISH STANDARD BS ISO 4925:2005 Incorporating Corrigendum No. 1 Road vehicles Specification of non-petroleum-base brake fluids for hydraulic systems ICS 43.040.40; 75.120 BS ISO 4925:2005 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 1 Ma
2、rch 2005 BSI 15 March 2005 ISBN 0 580 45557 2 National foreword This British Standard reproduces verbatim ISO 4925:2005 and implements it as the UK national standard. It supersedes BS AU 174-2:1985 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PRI/6
3、9, Components and fluids for vehicle braking systems, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may
4、 be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users a
5、re responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, an
6、d keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 25 and a back cover. The BSI copyright n
7、otice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments 15630 Corrigendum No. 1 15 March 2005 Correction to supersession Reference number ISO 4925:2005(E) OSI 5002INTERNATIONAL STANDARD ISO 4925 Second edition 2005-02-0
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13、1-HC 02 av leT. 4 + 10 947 22 1 11 xaF0 947 22 14 + 9 74 E-mail coirypthgiso.o gr We bwww.is.o gro Published in Switzerland ii ISO 5002 Allr ithgsr esedevrBS5002:5294CEIBSISO4925:20052ISO 4925:2005(E) I SO 5002 All irthgs ersedevr iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative ref
14、erences . 1 3 Materials. 2 4 Specifications 2 5 Test methods. 5 5.1 Viscosity. 5 5.1.1 General. 5 5.1.2 Repeatability (single analyst). 5 5.1.3 Reproducibility (multi-laboratory) . 5 5.2 Equilibrium reflux boiling point (ERBP) . 5 5.2.1 General. 5 5.2.2 Preparation of apparatus 5 5.2.3 Test procedur
15、e 6 5.2.4 Repeatability (single analyst). 6 5.2.5 Reproducibility (multi-laboratory) . 6 5.2.6 Wet ERBP test . 6 5.3 pH 9 5.4 Fluid stability . 9 5.4.1 High-temperature stability 9 5.4.2 Chemical stability 10 5.5 Corrosion . 10 5.5.1 Metal strip characteristics prior to testing . 10 5.5.2 Preparatio
16、n of joints . 10 5.5.3 Test procedure 11 5.6 Fluidity and appearance at low temperatures 11 5.6.1 At 40 C for 144 h . 11 5.6.2 At 50 C for 6 h . 12 5.7 Water tolerance . 12 5.7.1 At 40 C for 22 h . 12 5.7.2 At 60 C for 22 h 12 5.8 Compatibility/miscibility with ISO 4926 fluid 12 5.8.1 At 40 C for 22
17、 h . 12 5.8.2 At 60 C for 22 h 12 5.9 Resistance to oxidation 12 5.10 Effect on rubber 13 5.10.1 General. 13 5.10.2 Test procedures 13 5.10.3 Repeatability (single analyst). 14 5.10.4 Reproducibility (multi-laboratory) . 14 Annex A (normative) ISO Styrene-butadiene rubber (SBR) brake cups for testin
18、g brake fluid. 15 Annex B (normative) Corrosion test strips 18 Annex C (normative) Corrosion strip assembly 19 Annex D (normative) Standard ethylene, propylene and diene (EPDM) terpolymer rubber slabstock 20 Annex E (normative) Triethylene glycol monomethyl ether (TEGME) brake fluid grade 22 Bibliog
19、raphy . 25 BSIEC4925:2005BSISO4925:20053IS:5294 O5002(E) iv I SO 5002 All irthgs ersedevrForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out
20、 through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO col
21、laborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International S
22、tandards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements
23、 of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 4925 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking systems and equipment. This second edition cancels and replaces th
24、e first edition (ISO 4925:1978), which has been technically revised. 5002:5294CEISBBSISO4925:20054IS:5294 O5002(E) I SO 5002 All irthgs ersedevr vIntroduction The specifications for fluids given in this International Standard incorporate a range of performance standards in use throughout the world a
25、t the time of publication. The classes include fluids technically equivalent to those designated DOT 3, DOT 4 and DOT 5.1. The major use of these fluids is in the hydraulic brake and clutch systems of road vehicles, but they can also be used in any suitable hydraulic system. 5002:5294CEISBBSISO4925:20055blank
