BRITISH STANDARD AUTOMOBILE SERIES BS AU 180 6 1982 ISO 6315 1980 Brake linings — Part 6 Method for assessment of seizure to ferrous mating surface due to corrosion [ISO title Road vehicles — Brake li[.]
Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BRITISH STANDARD AUTOMOBILE SERIES BS AU 80-6:1 982 ISO 631 :1 980 Brake linings — Part 6: Method for assessment of seizure to ferrous mating surface due to corrosion [ISO title: Road vehicles — Brake linings — Seizure to ferrous mating surface due to corrosion — Test procedure] UD C 62 1 - 597 6: 620 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 80-6:1 982 National foreword This British Standard has been prepared under the direction of the Automobile Road vehicles — Brake linings — Seizure to ferrous mating surface due to corrosion — Test procedure” published by the International Organization for Standards Committee and is identical with ISO 631 5: 980 “ 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 Wherever the words “International Standard” appear, referring to this standard, they should be read as “British Standard” 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 Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages and and a back cover This standard has been updated (see copyright date) and may have had This British Standard, having been prepared under the direction of the Automobile amendments incorporated This will be indicated in the amendment table on the inside front cover Standards Committee, was published under the authority of the Board of BSI and comes into effect on Amendments issued since publication 31 March 982 © BSI 02- 2000 The following BSI references relate to the work on this standard: Committee reference AUE/1 Draft for comment 78/80971 DC ISBN 80 25 37 Amd No Date of issue Comments Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 80-6:1 982 Contents Page National foreword © BSI 02 - 000 Inside front cover Introduction Scope and field of application 1 Test apparatus Sampling and preparation Test procedure Test report i Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI ii blank Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 80-6:1 982 Introduction Vehicles operating in wet weather may be parked with brakes “on” for considerable periods The wet conditions are conducive to corrosion which may result in a bond forming between lining and mating surface If of sufficient strength, the bond may be intact after brake release thus restraining the road wheels Scope and field of application This International Standard specifies a laboratory method for conditioning brake linings in an environment that will promote corrosion, and a test method to assess the strength of bond formed by corrosion For comparison of lining behaviours, it is essential that the material and condition of ferrous mating surfaces be constant and repeatable This International Standard applies to drum brake linings and disc brake pads fitted to the brakes of road vehicles They may be tested in new or used condition When linings are assembled to shoes, the assemblies shall be ground to a radius that will ensure full area contact with the drum braking path The contacting surfaces of the linings and drum shall be clean, free from dust and of condition and finish that are representative of normal manufacturing standards 3.1 Disc brakes Six representative pads and one disc are required — Pad and disc contact surfaces must be flat — The contacting surfaces of the pads and disc shall be clean, free from dust and of condition and finish that are representative of normal manufacturing standards 3.2 Used components Care must be exercised when removing components from a vehicle to avoid damage or contamination The components shall be marked before removal so that they may be reassembled in the same relative positions during test Components may be tested with their working Test apparatus surfaces as removed from the vehicle, or the friction The required apparatus shall consist of: material surfaces may be lightly rubbed with grit 2.1 for drum brakes, a means such as screws and paper and the iron surfaces rubbed with grit paper torque wrench, by which the shoes with linings may and cleaned with petroleum-ether be maintained in contact with the drum at a known pressure; Test procedure 2.2 for drum brake linings, an axle, to which the testing new components, the same procedure is to drum may be locked and about which a lever which In be carried out for the six samples connects fairly with a brake shoe may rotate A — Set the humidity chamber controls to provide a means for measuring force applied to the lever is relative humidity of 95 ± % at 50 ± °C required; — Place the linings or pads to be tested in the 2.3 for disc brake pads, a means such as dead weight chamber in a position that ensures full exposure or clamp, for maintaining pad and disc in contact at of the working faces for a period of h a known pressure; — Place the test drum or disc in the same cabinet 2.4 for disc brake pads, a table, to which a disc may for 1/2 h, timed so that exposure is completed at be clamped and a measurable force applied fairly to the same time as the friction materials a radial edge of a pad; — In the case of linings and drums, remove them 2.5 a humidity chamber large enough to accept from the chamber, remove surface droplets of drums and discs; moisture with water absorbant paper, and 2.6 water absorbent paper, free of clays, assemble the two shoes in the drum using the diatomaceous earth, etc., and containing no clamping device to give a projected unit pressure chemicals that could affect rusting behaviour of 500 kPa Exercise care to avoid rubbing the surfaces when removing surplus moisture Sampling and preparation — In the case of pads and disc, after removal of 3.1 New components surface moisture with water absorbant paper, locate the pads on the disc and hold in position 3.1 Drum brakes under a pressure of 500 kPa Six representative full size linings, or parts of such — Place the assemblies in the humidity chamber linings (width equal to shoe width, with maximum for a further 16 h under the same conditions of 80 mm, and length equal to lining sample width), two shoes and one drum are required © BSI 02-2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 80-6:1 982 — After exposure in the cabinet, remove the Test report assemblies without dismantling and allow to The test report should include the following air dry in normal room atmosphere (20 °C/65 % particulars: relative humidity) for 48 h a) size and quality of linings or pads; — Place the assemblies in their respective test b) number of samples tested; rigs and remove the clamping devices carefully so that the test samples are not jarred or disturbed c) condition of friction material (new or used, natural or prepared); — Apply a steadily increasing force in the same direction as would be performed by the mating d) type and size of drum or disc; new or used, part of the brake, i.e radially for disc brakes and natural or prepared; tangentially for drum brakes, until the pad slips e) mean value and range of torque or force on the disc or the lining and shoe slide on the required for all samples to slide relative to the drum inner surface Record the force at which slip counter surfaces occurs and its position applied © BSI 02-2000 Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI blank Li cen sed Copy: Lon d on Sou th Ban k U n i versi ty, Lon d on Sou th Ban k U n i versi ty, Sat Dec 09 01 : 52: G M T+00: 00 2006, U n trol l ed Copy, (c) BSI BS AU 80-6:1 982 ISO 631 :1 980 BSI — British Standards Institution BS I is the indep endent national b ody res p ons ib le for p rep aring Britis h S tandards It p res ents the UK view on s tandards in E urop e and at the international level It is incorp orated b y Royal C harter Revisions Britis h S tandards are up dated b y amendment or revis ion Us ers of Britis h S tandards should make s ure that they p oss es s the latest amendments or editions It is the constant aim of BS I to imp rove the quality of our p roducts and services We would b e grateful if anyone finding an inaccuracy or amb iguity while us ing this Britis h S tandard would inform the S ecretary of the technical committee res p ons ib le, the identity of which can b e found on the inside front cover Tel: 02 89 96 90 00 Fax: 02 89 96 40 BS I offers memb ers an individual up dating s ervice called PLUS which ens ures that s ub s crib ers automatically receive the lates t editions of s tandards Buying standards O rders for all BS I, international and foreign s tandards p ub lications s hould b e addres s ed to C us tomer S ervices Tel: 899 00 Fax: 899 7001 In res p ons e to orders for international standards , it is BS I p olicy to sup p ly the BS I imp lementation of thos e that have b een p ub lis hed as Britis h S tandards, unless otherwis e requested Information on standards BS I p rovides a wide range of information on national, E urop ean and international standards through its Lib rary and its Technical H elp to E xp orters S ervice Various BS I electronic information s ervices are also availab le which give details on all its p roducts and s ervices C ontact the Information C entre Tel: 02 89 96 71 1 Fax: 02 89 96 048 S ub s crib ing memb ers of BS I are kep t up to date with s tandards develop ments and receive sub s tantial discounts on the p urchase p rice of s tandards For details of thes e and other b enefits contact Memb ership Adminis tration Tel: 02 89 96 70 02 Fax: 02 89 96 00 Copyright C op yright s ub s is ts in all BS I p ub lications BS I als o holds the cop yright, in the UK, of the p ub lications of the international s tandardization b odies E xcep t as p ermitted under the C op yright, D es igns and Patents Act 988 no extract may b e rep roduced, s tored in a retrieval s ystem or transmitted in any form or b y any means – electronic, p hotocop ying, recording or otherwis e – without p rior written p ermis s ion from BS I This does not p reclude the free us e, in the cours e of imp lementing the standard, of necess ary details such as s ymb ols, and size, typ e or grade designations If thes e details are to b e used for any other p urp os e than imp lementation then the p rior written p ermiss ion of BS I must b e ob tained If p ermis sion is granted, the terms may include royalty p ayments or a licensing agreement D etails and advice can b e ob tained from the C op yright Manager BS I 89 C his wick H igh Road London W4 4AL Tel: 02 89 96 70