BS ISO BRITISH STANDARD 4928:2006 Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (Service temperature 120 C max.) ICS 43.040.40; 83.140.50 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSIS04928:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO 4928:2006. The UK participation in its preparation was entrusted to Technical Committee PRI/69, Components and fluids for vehicle braking systems. Alist of organizations represented on PRI/69 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendmentsissuedsincepublication published underthe authority of the Standards Policy and Amd. No. Date Comments Strategy Committee on 29 September 2006 BSI 2006 ISBN0580487334 BSISO4928:2006 ISO INTERNATIONAL 4928 STANDARD Third edition 2006-07-15 Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (Service temperature 120 °C max.) Vehicules routiersCoupelles et joints en caoutchoucpourcylindres de dispositifs de freinage hydrauliques utilisant un liquide de frein a basenonpetroliere (Temperaturemaximale d'utilisation120C) Reference number ISO 4928:2006(E) BSISO4928:2006 ii BSISO 4928:2006 Contents Page Foreword iv 1 Scope. 2 Normative references. 3 Terms and definitions... 4 General requirements.. 4.1 Workmanship and finish 4.2 Marking ..... 4.3 Packaging. 4.4 Sampling.... 5 Test requirements... 5.1 Resistancetofluid at elevatedtemperature 5.2 5.3 Wheel cylindersealsheatpressurestroking 5.4 Master cylinder sealsheat pressure stroking 5.5 Low-temperature performance... 5.6 Oven ageing .. 5.7 Corrosion..... 5.8 Storage corrosiontest.... 9 Test procedures.. 6.1 Resistancetofluidatelevated temperature- Dimensionaltest. 6.2 Precipitation test.... 6.3 Wheel cylindersealsheat pressurestroking ... 6.4 Master cylinder seals heat pressure stroking 6.5 Low-temperature performance... 6.6 Oven ageing .... 6.7 Hardness determination... 6.8 Corrosiontest 6.9 Storage corrosion test. ili BSIS04928:2006 Foreword ISsO (the International Organization for Standardization) is a worldwide federation of national standards bodies technical committees. Each member body interested in a subject for which a technical committee has been InternationalElectrotechnicalCommission(lEC)onallmattersofelectrotechnicalstandardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2 The main task of technical committees is to prepare International Standards. 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 of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO40421waspreparedbyTechnicalCommitteeISO/TC22,Roadvehicles,SubcommitteeSC2,Braking andsystemsequipment. This third edition cancels and replaces the second edition (isO 4928:1980), which has been technically revised. iv BSISO4928:2006 Road vehicles Elastomeric cups and seals for cylinders for hydraulic braking systems using a non-petroleum base hydraulic brake fluid (Service temperature 12o °C max.) 1 Scope for road vehicles; it does not include requirements relating to chemical composition, tensile strength and elongation of the rubber compound. Disc brake seals are not covered by this International Standard. This International Standard is applicable to