Bsi bs au 180 6 1982 (2000) iso 6315 1980

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[.]

BRITISH STANDARD AUTOMOBILE SERIES

180-6:1982

ISO 6315:1980

[ISO title: Road vehicles— Brake l ning s— Seizure to fer ous

m ating sur ac due to c r osion— Test procedure]

U C 6 9.1 -5 7.6:6 0.1

This Bri shStan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Commi e ,was

published u der the authoriy

ofthe Bo rd of BSI an

comesinto fect on

3 Mar h1 8

© BSI0 -2 0

The folowing BSI references

relate to the work on this

stan ard:

Commi e reference AUE/11

Draft for comment7 /80 7 DC

This BritishStand rd has be n prep red u der the direction of the Automobie

Stand ards Commit e and is identical with ISO6 15:19 0 “ R oa d vehicle —

B r a ke lnings— Seizur e to fer r ous ma ting sur fa ce d ue to cor r osion—

Te tpr oc d ur e” publ shed b the International Org anization for

Stand rdization ( ISO)

Term inolog y and conventions The text of the International Stand rd has

be n a prov ed as suita le for publcation as a BritishStand rd without

dev iation Some terminolog y and certain conv entions are not identical with

those used in BritishStand rds; at ention is especialy d rawn to the fol owing

W herev er the words “ nternational Stand ard” a pear, refer ing to this

stand ard, they should be read as “ British Stand ard”

A British Stand rd do s not purport to include al the neces ary prov isions of

a contract User of British Stand ard s are responsible for their cor ect

a pl cation

Compl anc with a British Standard does not of itselfconfer imm unity

f om leg al o l g ations

Sum m ary of pag es

This d ocument comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 and 2 and a b ck cover

This stand rd has be n upd ated ( se copy rig ht d ate) and ma hav e had

amend ments incorporated This wi l be indicated in the amendment ta le on

the inside f ont cov er

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

Pag e

b

0 Introduction

Vehicles operating in wet weather ma be p rked

with brakes “ on” for considera le periods The wet

conditions are conduciv e to cor osion which ma

result in a bond forming betwe n l ning and mating

sur ace

I of suficient streng th,the bond ma be intact after

brake release th s restraining the roa whe ls

1 Scope and field ofappl cation

This International Stand ard specifies a la oratory

method for conditioning brake l ning s in an

env ironment that wi l promote cor osion, an a test

method to as es the streng th of bond formed b

cor osion For comp rison of lning behav iour , it is

es ential that the material and cond ition of fer ous

mating suraces be constant and repeata le

This International Stand rd a pl es to drum brake

lning s and dis brake p ds fit ed to the brakes of

road v ehicles They ma be tested in new or used

cond ition

2 Test apparatus

The req uired a p ratus shal consist of:

2.1 for drum brakes, a means such as s rews and

torq ue wrench, b which the sho s with l ning s ma

be maintained in contact with the drum at a k own

pres ure;

2.2 for drum brake lning s, an a le, to which the

drum ma be locked and a out which a lev er which

con ects fairly with a brake sho ma rotate A

means for measuring for e a pled to the lev er is

req uired;

2.3 for dis brake p d s, a means such as dea weig ht

or clamp,for maintaining p d and dis in contact at

a k own pres ure;

2.4 for dis brake p ds, a ta le, to which a dis ma

be clamped and a measura le for e a pled fairly to

a ra ial edg e of a p d;

2.5 a h midity chamber larg e enoug h to ac ept

d rums and d is s;

2.6 water a sorbent p per, fe of clay s,

diatomace us earth, etc and containing no

chemicals that could afect rusting behav iour

3 Sampl ng a nd pr pa ration

3.1 New com ponents

3.1.1 Drum brake

Six representativ e ful siz lning s, or p rts of such

lning s ( width equal to sho width, with ma imum

of8 mm, an leng th eq ual to lning sample wid th),

two sho s an one drum are required

W hen lning s are as embled to sho s, the

as embl es shal be g rou d to a ra ius that wi l

ensure ful area contact with the d rum braking

p th

The contacting sur aces of the lning s an drum

shal be clean, f e fom dust and of cond ition an

finish that are representativ e of normal

man facturing stand ard s

3.1.2 Dis brake

Six representativ e p d s and one dis are req uired

— Pad and d is contact sur aces must be flat

— The contacting sur aces of the p ds an d is

shal be clean,fe f om dust an of condition and

finish that are representativ e of normal

man facturing stand rd s

3.2 Used com ponents

Care must be exer ised when remov ing components

f om a v ehicle to av oid d mag e or contamination

The components shal be marked before remov al so

that they ma be reas embled in the same relativ e

positions d uring test

Components ma be tested with their working

sur aces as remov ed f om the v ehicle, or the fiction

material suraces ma be lg htly rub ed with g rit

p per and the iron sur aces rub ed with g rit p per

and cleaned with petroleum-ether

4 Test procedur

In testing new components, the same procedure is to

be car ied out for the six samples

— Set the humid ity chamber controls to prov ide a

relativ e h mid ity of9 ±2 % at5 ±3°C

— Place the l ning s or p ds to be tested in the

chamber in a position that ensures ful ex osure

of the working faces for a period of4h

— Place the test d rum or d is in the same ca inet

for1/ 2h, timed so that ex osure is completed at

the same time as the fiction materials

— In the case of lning s and drums, remov e them

f om the chamber, remov e sur ace droplets of

moisture with water a sorb nt p per, and

as emble the two sho s in the d rum using the

clamping d ev ice to g iv e a projected u it pres ure

of5 0kPa Exer ise care to av oid rub ing the

sur aces when remov ing surplus moisture

— In the case of p ds and dis , after remov al of

sur ace moisture with water a sorb nt p per,

locate the p ds on the dis an hold in position

u der a pres ure of25 0kPa

— Place the as embl es in the humid ity chamber

for a further16h u der the same conditions

— After ex osure in the ca inet, remov e the

as embles without d ismantlng and al ow to

airdry in normal ro m atmosphere( 20°C/6 %

relativ e h mid ity ) for4 h

— Place the as embles in their respectiv e test

rig s an remov e the clamping d ev ices careful y so

that the test samples are not jar ed or disturbed

— Apply a stead ily inc easing for e in the same

direction as would be per ormed b the mating

p rt of the brake, i.e.ra ialy for dis brakes and

tang ential y for drum brakes, u ti the p d sl ps

on the d is or the lning an sho sl de on the

d rum in er sur ace Record the for e at which slp

oc ur and its position a pled

5 Test report

The test report should include the folowing

p rticular :

a) siz an q ualty of lning s or p d s;

b) n mber of samples tested;

c) cond ition of f iction material ( new or used ,

natural or prep red);

d) ty pe an siz of d rum or dis ; new or used,

natural or prep red ;

e) mean v alue an rang e of torq ue or for e

req uired for al samples to sl de relativ e to the

cou ter sur aces

b

ISO 6315:1980

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