Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. इंटरनेट मानक “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda “Invent a New India Using Knowledge” “प0रा1 को छोड न’ 5 तरफ” Jawaharlal Nehru “Step Out From the Old to the New” “जान1 का अ+धकार, जी1 का अ+धकार” Mazdoor Kisan Shakti Sangathan “The Right to Information, The Right to Live” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS 2742-2 (1999): Automotive Vehicles - Brake Linings - Rubberised, Part 2: Specification [TED 4: Automotive Braking Systems]
Transcript
Disclosure to Promote the Right To Information
Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public.
इंटरनेट मानक
“!ान $ एक न' भारत का +नम-ण”Satyanarayan Gangaram Pitroda
“Invent a New India Using Knowledge”
“प0रा1 को छोड न' 5 तरफ”Jawaharlal Nehru
“Step Out From the Old to the New”
“जान1 का अ+धकार, जी1 का अ+धकार”Mazdoor Kisan Shakti Sangathan
“The Right to Information, The Right to Live”
“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता है”Bhartṛhari—Nītiśatakam
“Knowledge is such a treasure which cannot be stolen”
“Invent a New India Using Knowledge”
है”ह”ह
IS 2742-2 (1999): Automotive Vehicles - Brake Linings -Rubberised, Part 2: Specification [TED 4: AutomotiveBraking Systems]
C
IS 2742 (Part 2) : 1999
Indian Standard
AUTOMOTIVE VEHICLES - BRAKE LININGS - RUBBERISED
PART 2 SPECIFICATION
ICS 43.040.40
0 BIS 1999
BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG
NEW DELHI 110002
April 1999 Price Group 3
Automotive Braking Systems Sectional Committee, TED 4
FOREWORD
This Indian Standard (Part 2) was adopted by the Bureau of Indian Standards, after the draft finalized by the Automotive Braking Systems Sectional Committee had been approved by the Transport Engineering Division Council.
The brake linings for automotive vehicles is considered as of significant importance because of their role in overall safety of the vehicle. This standard is one in the series of Indian Standards being developed for braking systems.
The temperature requirements of IS 2742 (Part 4) have been found to be not relevant to rubber based brake linings. Hence a need was felt to change the test cycle for such a liner.
Approval of the brake liner for application on a specific vehicle model is based on vehicle test as laid down in this standard applicable to the category to which the vehicle model belongs to. As the tests in this standard are not intended to replace the testing of brakes on a vehicle or dynamometer, it being accepted that a full assessment of a linihg can be made only under operating conditions.
This standard is hence intended to be used for checking consistency of the brake linings manufacturer.
The properties shall be identified with a particular brake lining and not with the brake or vehicle on which this lining is used.
The committee responsible for preparation of this standard is given in Annex C.
IS 2742 (Part 2) : 1999
Indian Standard AUTOMOTIVE VEHICLES - BRAKE LININGS -
RUBBERISED
PART 2 SPECIFICATION
I SCOPE
This standard (Part 2) covers the terminology, dimensional tolerances and performance requirements for rubber based brake linings.
2 REFERENCES
The following standards contain provisions which through reference in this text, constitute provision of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:
IS No.
2500 (Part 1) : 1992
2742 (Part 3) : 1994
2742 (Part 4) : 1994
3400 (Part 1) : 1987
Title
Sampling inspection procedures : Part 1 Attribute sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection (second revision)
Automotive vehicles - Brake linings : Part 3 Methods of test
Automotive vehicles - Brake linings : Part 4 Co-efficient of friction - Method of test
Methods of test for vulcanized rubbers : Part 1 Tensile stress-strain properties (second revision)
3 TERMINOLOGY
For the purpose of this standard, the following definitions shall apply.
3.1 Brake Lining
A piece of friction material used on brake assembly.
3.2 Rigid Lining
Lining which is formed to suit a specific brake drum diameter.
3.3 Heat Swell
It is the difference in the thickness of the specimen measured while it is hot, from the initial thickness.
3.4 Water Swell
The difference in thickness measured at the five points equally spaced along the length of the blank and on
the centre point of the width, before and after soaking
in water.
3.5 Normal Co-efficient of Friction
It is defined as the average of four points on the fade cycle located at 93-C, 12 l”C, 149°C and 205°C.
3.6 Hot Co-efficient of Friction
It is defined as the average of seven points on 149°C 205-C, 233°C and 261°C on the fade cycle and 261°C 205°C and 149°C on the recovery cycle.
NOTE-If any temperature point or points required for calculating
friction coefficient are not reached in the prescribed time limit of
10 minutes, the coeff%zient of friction value at tenth minute shall
be used to give the full number of points required.
4 DIMENSIONAL TOLERANCE
Unless otherwise agreed to, the tolerances on width, thickness and length shall be as given in Table 1. These tolerances are applicable to the brake lining either in moulded or in the form of coil lengths as supplied by manufacturer for assembly.
Table I Dimensional Tolerances of Piece Type Brake Linings
(Chuse 4)
Parameter Tolerance, mm
Width * 0.4
Thickness f 0.2
Length f 1.5
5 GENERAL REQUIREMENTS
5.1 The finished linings shall be free from defects such as cracks, scouring marks, indentations, unevenness or any other defects affecting its life and serviceability.
IS 2742 (Part 2) : 1999
5.2 The frictional characteristic.+ of the lining as declared by the lining manufacturer as per 7.8 shall be maintained throughout the life of the wearing portion.
5.3 The lining shall conform to the requirements stipulated when tested any time within one year of normal storage, provided the linings are stored according to the lining manufacturers recommendations.
5.4 The properties required for bonding and bonding process shall be as agreed to between the manufacturer and the purchaser.
5.5 The tests for the properties shall be carried out as specified in IS 2742 (Part 3) for each test. The acceptance norms for the properties other than those specified shall be as agreed between the purchaser and the manufacturer of brake linings.
6 SAMPLING
Unless otherwise agreed to between the manufacturer and the purchaser the sampling plan shall be in accordance with IS 2500 (Part 1). All brake linings of same type, size and same material and manufactured under similar conditions shall constitute a lot for sampling purposes.
7 TEST REQUIREMENTS
The following properties shall be specified by the lining manufacturer. Any other requirements shall be as agreed between the manufacturer and the purchaser :
a> b) c) 4 e! f3 8) h)
Density, Shore hardness, Tensile strength, Acetone extract, Water swell, Loss of weight on ignition, Heat swell test, and Frictional test : i) Normal co-efficient of friction, and ii) Hot co-efficient of friction.
7.1 Density
When tested in accordance with 5.1 of IS 2742 (Part 3) the density shall comply with values stated by the manufacturer.
7.2 Shore Hardness
The shore hardness test shall be carried out according to 5.3 of IS 2742 (Part 3).
7.3 Tensile Strength
Tensile strength test shall be carried out on a dumb bell shaped sample as per IS 3400 (Part 1) on a tensile testing machine. In case design width of the lining is less than 25 mm, actual width of the sample may be
used for conducting the test instead of the dumb bell shaped sample.
7.4 Acetone Extract
When tested by the method described in 5.5 of IS 2742 (Part 3) the linings shall comply with the values stated by the manufacturer.
7.5 Water Swell Test
The test shall be carried out as per 5.6 of IS 2742 (Part 3) and shall meet the values recommended by the manufacturer.
7.6 Loss of Weight on Ignition
The linings shall comply with the recommended values when tested in accordance with 5.7 of IS 2742 (Part 3).
7.7 Heat Swell Test
The heat swell of lining shall not exceed 0.25 mm when tested as per 5.8 of IS 2742 (Part 3).
7.8 Frictional Test
The normal co-efficient of friction and hot co-efficient of friction values shall meet the manufacturer’s recommended values when tested in accordance with IS 2742 (Part 4), at the temperature specified in 3.5 and 3.6.
8 PACKING
The linings shall be packed as per accepted trade practices.
9 MARKING
9.1 The normal co-efficient of friction and hot co-efficient of friction shall be marked on the lining as indicated below:
Example : A rubberised brake lining having coefficient of friction as 0.40 and hot coefficient of friction as 0.28 shall be marked as 40128.
9.2 The brake lining shall be clearly marked with its make, type and manufacturer’s trade-mark, where applicable, the vehicle reference or part number shall also be marked.
9.2.1 An oversize lining shall be marked with a suffix of the standard size to indicate the extent of oversize. The suffix shall only be a number which shall indicate the oversize in millimetres. The marking shall be preferably on the inner surface or sides. In case this is not possible because of non-availability of space or functional requirements, the markings may be made on the upper surface.
2
IS 2742 (Part 2) : 1999
9.3 Presentation of Test Data
9.3.1 Data shall be presented in format given in Annex A.
9.3.2 Data shall be plotted on graph in the format given in Annex B.
ANNEX A (CZuuse 9.3.1)
FORMAT FOR REPORTING TEST DATA
Job No. Material
Lot
Reference
Test No.
Date
Operator
Mass Thickness Indicator Reading
Intitial
Final
Loss
First Base Line I Recovery Indicator Reading Wear Test
Appli- Friction cation Force No. N
1 10 20 30 40 50 60 70 80 90
100
FADE
Appli- cation No.
Friction Force N
FC* FC* Temp “C
Friction Force N
FC* TemF “C
Frictior Force N
FC*
1 5 10 15 20
93 121 149 205 233 261
261 205 149
Minutes to achieve 26 1 “C or
=
Temperature reached at 10th minute Friction force =
P zz
Remarks :
FC* = Friction coeffkient p.
3
.
IS 2742 (Part 2) : 1999 .
ANNEX B (Clause 9.3.2)
FORMAT FOR GRAPH
First Base Line
0.7
Friction
co- Efficient
93 121 149 205
FADE RECOVERY
0.2
0.1 I I I
0 10 20
WEAR MASS THICKNESS : START
261 205 149
Temperature
WEAR
FINISH
LOSS
PERCENT
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IS 2742 (Part 2) : 1999
ANNEXC (Foreword)
COMMITTEE COMPOSITION
Chairman
BRIG (RETD) S. R. %KANIK
Automotive Braking Systems Sectional Committee, TED 4
Representing
Automotive Research Association of India, Pune
Members
SHRI H. S. DEW
>
[Alternate to
SHRl M. S. 0CAI.E Brig (Retd.) S.R.Puranik]
SHRI VOAY KUMAR SHRI RAIESH G~YAL (Alternate)
Allied Nippon Ltd, Sabibabad
SHRI P. NAGESHWAR RAO Ashok Leyland Ltd, Chennai
SW T. M. BALARAMAN Stun C. Y. DESHPANDE (Alfernote)
Bajaj Auto Ltd, Pune
SHRI V. S. VENKATESAN SHIU K. N. BALAJI (Alternate)
Brakes India Ltd, Chennai
SHR~ V. M. MUNDADA Smu R. M. KANITKAR (Alfernate)
Bajaj Tempo Ltd, Pune
SHRI S. R. TAPADE SHR~ S. KUMAR (Alternate)
Central institute of Road Transport, Pune
SHIU D. K. SHUKLA SHFZ A. CHAITEIUEE (Alternate)
Contrellorate of Quality Assurance (Vehicles), Ahmednagar
SHRI DINESH TYAGI
SHRI V. RADHA MANOHAR (Alternate)
Daewoo Motors India Ltd, Dadri
SHRI S. VENKA-~ATE~H SW S. P. DESHPANDE (Alternate)
Either Motors Ltd, Pithampur
SHN K. C. JAIN Smu R. K. Guw~ (Allenate)
SHN S. RAMASWAMY DR V. G. NAIK (Alternofe)
Escorts Ltd (MSD), Faridabad
Hindustan Composites Ltd, Mumbai
Sm S. RAMASWAMY Hindustan Ferodo Ltd, Mumbai
SHRI HAIUIT SINGH Stun ATUL KUMAI~ (Allernofe)
Sm 1. S. KHADILKAR SHRI S. S. PATIL (Alternote)
SHRI V. R. MARATHE SHRI P. V. BHANLXE (Alternate)
SHRI R. SIVA KUMAR
HMT Ltd (Tractor Dim), Pinjore
Kalyani Brakes Ltd, Pune
Kinetic Engg Ltd, Pune
Mahindra and Mahindra Ltd, Nasik
SHRI I. v. RAO SHRI DEEPAK SAWKAR (Alternate)
Maruti Udyog Ltd, Gurgaon
SHRI K.V. RAMI REDDY Ministry of Surface Transport, New Delhi
&RI s. s. kiHOSLA
SHW A. P. SINGH (Alternate)
SHN M. K. MISHM
SHRI R. G. KAKEMORE (Alternote)
SHRI V.R. KULKARNI SHRI S. RAMANATHAN (Alternate)
Ministry of Industry, New Delhi
Ordnance Factory Board, Jabalpur
Pal-Peugeot Ltd, Dombivli (East), Thane
5
(Continued on page 6)
a
IS 2742 (Part 2) : 1999
(Continuedfrom page 5)
Members
SHUI S. N. SRWWASAN
SHRI V. MURUGAN (Alternafe)
SHIU V. RAMAKWHNAN
SHRI S. M. IQBAL (Alfernate)
SHRI VEENU MATHUR
SHRI Y. V. NAGARAJ (Alternate)
SHRI P. D. JoSHl
SHR~ C. M. MEHTA (Ahernate)
SHRI K. PANDARINATH
SHRI V. R. JANARDHAM (Alternate I) SHRI K. N. RAVI (Alternate II)
SH~U S. SELVAMANI SW MANOHAR M. HEGDE (Alternafe)
SHRI S. R. AGARHARI
SHW V. R. PALUSKAR
SHRI G. R. NAGABHUSHAN (Alternate)
SHRI M. N. MLIRALIKRISHNA
SW R. C. SETHI SHRI N. KURUPPAIAH (Alternate I) SHRI K. SENTHLL KUMAR (Alternate II)
