BS-AU-180-5-1983 ISO-6314-1980.pdf

BRITISH STANDARD AUTOMOBILE SERIES BS AU 180-5:1983 ISO 6314:1980 Brake linings Part 5: Method for determining resistance to water, saline solution, oil and brake fluid of brake lining material ISO title: Road vehicles Brake linings Resistance to water, saline solution, oil and brake fluid Test procedure UDC 629.11-597.6:620.1 Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1983 © BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference AUE/11 Draft for comment 78/80970 DC ISBN 0 580 13139 4 Committee responsible for this British Standard This British Standard was published under the direction of the Automobile Standards Committee AUE/-. Its preparation was entrusted to Technical Committee AUE/11 upon which the following bodies were represented: Association of Hydraulic Equipment Manufacturers Automobile Association British Friction Materials Council Department of Transport London Transport Executive Motor Industry Research Association National Caravan Council Limited Society of Motor Manufacturers and Traders Limited Transport and General Workers Union Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 © BSI 02-2000i Contents Page Committee responsibleInside front cover National forewordii 0Introduction1 1Scope and field of application1 2References1 3Definition1 4Test apparatus1 5Sampling and preparation1 6Test procedure1 7Evaluation of results2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 ii © BSI 02-2000 National foreword This British Standard has been prepared under the direction of the Automobile Standards Committee and is identical with ISO 6314:1980 “Road vehicles Brake linings Resistance to water, saline solution, oil and brake fluid Test procedure” published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard”. The Technical Committee has reviewed the provisions of ISO 611 and ISO 6312, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO 6312:1981 is BS AU 180 “Brake linings” Part 3 “Method for measurement of shear strength of disc brake pad and drum brake shoe assemblies”. At present there is no corresponding British Standard for ISO 611. However, it is intended to publish a related standard at a future date. NOTETextual error. Footnote 1) is not applicable. ISO 1817-1975 is in course of revision. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 1817:1975 BS 903 Methods of testing vulcanized rubber Part A16:1971 The resistance of vulcanized rubber to liquids (Technically equivalent) ISO 4926:1978 BS AU 174 Hydraulic brake systems, using non-petroleum base brake fluids, for road vehicles Part 1:1979 Specification for non-petroleum base reference fluids (Identical) ISO 6311:1980 BS AU 180 Brake linings Part 2:1982 Method for measurement of internal shear strength of lining material (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 © BSI 02-20001 0 Introduction In a variety of circumstances it is not unknown for automotive brake linings to become contaminated by water from rain, or salt from sea spray, or oil from axle seal failure or fluid from a wheel cylinder leak. Such contamination could cause changes in mechanical strength and or physical shape of a brake lining and thereby reduce its functional capability. 1 Scope and field of application This International Standard specifies a laboratory method for exposing samples to detrimental environments, measuring the effect on strength and shape and comparing the results with those from uncontaminated samples. It applies to drum brake linings and disc brake pads being of organic content and intended for service on road vehicles. 2 References ISO 611, Braking of motor vehicle and their trailers Terminology. ISO 1817, Vulcanized rubbers Resistance to liquids Method of test. ISO 4926, Road vehicles Hydraulic brake systems Non-petroleum base reference fluids. ISO 6311, Road vehicles Brake linings Internal shear strength of lining materials Test procedure. ISO 6312, Road vehicles Brake linings Shear strength of disc brake pad and drum brake shoe assemblies Test procedure. 3 Definition For the purpose of this International Standard, the following definition applies: resistance the ability to resist a change in thickness or shear strength due to contamination expressed as percentage of the figures for similar uncontaminated specimens 4 Test apparatus The test apparatus shall consist of: a) containers, for fluids and immersed samples; b) ball-ended micrometer, for measuring sample thickness; c) a material shear test rig, as described in ISO 6311 or ISO 6312. 5 Sampling and preparation Take at random, from the factory output, a minimum of fifteen representative linings or pads of nominally the same shape, size and material. Prepare samples in accordance with the requirements of ISO 6311 or ISO 6312, whichever appropriate for the samples. Mark all samples with a similar pattern of five selected spots for measurements of thickness. Mark each sample with a distinguishing identity. Measure and record the thickness to a tolerance of 0,01 mm at each spot on each sample, taking care not to indent the samples. Place the test samples at random into five groups of three and keep these groups apart. 6 Test procedure Test to be performed at ambient temperature, which should be noted. In order to present a maximum surface to the active agents, the samples shall be stored in a vertical position during the contamination period, without touching each other. 6.1 Group I Store the three samples in normal room atmosphere for 7 days. Measure and record thickness at each spot immediately prior to shearing. Shear test all samples in accordance with ISO 6311 or ISO 6312 and record the figures. 6.2 Group II Store the three samples in a bath of water for 7 days. Remove from bath and dry surfaces with absorbent paper. Measure and record thickness at each spot within 10 min of drying and immediately prior to shearing. Shear test all samples in accordance with ISO 6311 or ISO 6312 and record the figures. 6.3 Group III Immerse the three samples in a bath containing a solution of sodium chloride, 100 g/l, for 7 days. Remove from the bath and dry the surfaces with absorbent paper. Measure and record thickness at each spot within 10 min of drying and immediately prior to shearing. Shear test all samples in accordance with ISO 6311 or ISO 6312 and record the figures. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 2 © BSI 02-2000 6.4 Group IV Immerse the three samples in a bath of lubricating oil, conforming to specification oil no. 2 in the Annex of ISO 1817, for 48 h. Remove from bath and dry surfaces with absorbent paper. Measure and record thickness at each spot within 10 min of drying and immediately prior to shearing. Shear test all samples in acordance with ISO 6311 or ISO 6312 and record the figures. 6.5 Group V Immerse samples in a bath of brake fluid conforming to specification of compatibility fluid in ISO 4926, for 48 h. Remove from bath and dry surfaces with absorbent paper. Measure and record thickness at each spot within 10 min of drying and immediately prior to shearing. Shear test all samples in accordance with ISO 6311 or ISO 6312 and record the figures. 7 Evaluation of results For each sample and at each stage of thickness measurement, average the five readings and record. Change of thickness by contamination is expressed as the difference in average thickness for each sample before and after contamination. The figures for the three samples may be averaged to give a figure for the product. Change of shear strength by contamination is expressed as the difference between the average of the contaminated samples and that for the uncontaminated samples. This may be given as a percentage of the average value for uncontaminated samples. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 © BSI 02-2000 Publications referred to See national foreword. Licensed Copy: London South Bank University, London South Bank University, Sat Dec 09 01:52:14 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS AU 180-5:1983 ISO 6314:1980 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions British Standards are updated by amendment or revision. Users of British Standards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. 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