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है”ह”ह

IS 11852-6 (2001): Automotive Vehicles - brakes and brakingsystems, Part 6: Vacuum braking system - Specialrequirements [TED 4: Automotive Braking Systems]

IS 11852 (Part 6): 2001

WYa%lm

Indian Standard

AUTOMOTIVE VEHICLES — BRAKES ANDBRAKING SYSTEMS

PART 6 VACUUM BRAKING SYSTEMS — SPECIAL REQUIREMENTS

(First Revision )

ICS 43.040.40

0 BIS 2001

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

April 2001 Price Group 2

Automotive Braking Systems Sectional Committee, TED 4

FOREWORD

This Indian Standard (Part 6) (First Revision) was adopted by the Bureau of Indian Standards, after the draftfinalized by the Automotive Braking Systems Sectional Committee had been approved by the TransportEngineering Division Council.

This Indian Standard on brakes and braking systems which was earlier issued in eight parts, has now beenrevised and issued in nine parts which are as unde~

Part 1

Part 2

Part 3

Part 4

Part 3

Part 7

Part 8

Part 9

Terminology

Generaj functions and features

Performance requirements and -evaluation

Compressed air and air assisted brakes — Special requirements

Compressed air and air assisted brakes — Pressure test connections

Inertia dynamometer test method for brake linings

Test procedures

Requirements for vehicles equipped with Anti-lock braking devices

IS 11852 (Part 7) :1995 Automotive vehicles — Recommendations for brakes and braking systems: Part 7model test report has been withdrawn in this revision and has been replaced with a part covering ‘Inertiadynamometer test methods for brake linings’. Part 9 covering the requirements for vehicles equipped with anti-Iock braking devices has been added.

This Indian Standard has been prepared to help the vehicle manufacturers in designing suitable braking systemfor various types of vehicles and also in evaluating their performance.

This standard is mainly based on EEC directive 7 l/320/EEC relating to the braking devices of certain categoriesof motor vehicles and of their trailers, as amended by EEC Directives 74/132/EEC, 75/524/EEC, 79/489/EEC,85/647 /EEC, 88/194/EEC and 91/422/EEC.

The composition of the committee responsible for formulating this standard is given in Annex A.

IS 11852 (Part 6): 2001

Indian Standard

AUTOMOTIVE VEHICLES — BRAKES ANDBRAKING SYSTEMS

PART 6 VACUUM BRAKING SYSTEMS — SPECIAL REQUIREMENTS

(First Revision )

1 SCOPE

This standard (Part 6) covers special requirementsapplicable to vacuum braking systemsfor road vehiclesas defined in IS 11852 (Part 2). The requirements forcapacity of storage devices and capacity of energysources are also covered.

2 REFERENCE

The following standard contains provisions whichthrough reference in this text, constitutes provisionsof this standard. At the time of publication, the editionindicated was valid. All standards are subject torevisions, and parties to agreements based on thisstandard are encouraged to investigate the possibilityof applying the most recent edition of the standardindicated below:

1SNo. Title11852 Automotive vehicles — Brakes and(Part 2) :2001 braking systems: Part 2 General

fimctions and features @strevision)

3 CAPACITY OF STORAGE DEVICES

3.1 General

3.1.1 Vehicles, on which operation of. the brakingsystem requires the use of a vacuum, shall be equippedwith energy storage devices of capacity meeting therequirements of 3.2 and 3.3 below.

3.1.2 However, the energy storage devices shall notbe required to be of a prescribed capacity if the brakingsystem is such that in the absence of any energy reserveit is possible for the system to achieve a brakingperformance at least equal to that prescribed for thesecondary braking system.

3.1.3 ‘In verifying compliance with the requirementsof 3.2 and 3.3, the brakes shall be adjusted-as closelyas possible.

3.2 M and N Vehicles (Motor Vehicles)

3.2.1 The energy storage devices of M and N categoryof vehicles as defined in IS 11852(Part 2) shall besuch that it is still possible to achieve the performanceprescribed for the secondary brakes as under.

3.2.1.1 Afler eight full-stroke actuations of the servicebrake control where the energy source is a vacuumpump.

3.2.1.2 Atler four fill-stroke actuations of the servicebrake where the energy source is the engine.

3.2.2 Testing shall be performed in conformity withthe following requirements:

a)

b)

c)

The initial energy level in the energy storagedevice or devices shall be that specified bythe manufacturer. It shall be such as to en-able prescribed service braking pefiormanceto be achieved and shall correspond to avacuum not exceeding 90 percent of the maxi-mum vacuum fiunished by the energy source.

The storage device or devices shall be dis-connected from the energy source. During thetest the auxiliary service storage device ordevices shall be isolated.

On vehicles to which the coupling of a traileror semi-trailer is authorized, the feed lineshall be stopped and an energy storage de-vice of 0.5 litre capacity shall be connectedto the control line. Afler the test referred toin 3.2.1, the vacuum level provided at thecontrol line shall not have fallen below a levelequivalent to one-half of the figure obtainedat the first brake application.

3.3 T Category of Vehicles (Trailers includingSemi-trailers)

3.3.1 The energy storage devices with which trailersare equipped shall be such that the vacuum levelprovided at the user points shall not have fallen belowa level equivalent to one-half of the value obtained atthe first brake application after a test comprising ofthe four full-stroke actuation of the trailer’s servicebraking system.

3.3.2 Testing shall be performed in conformity withthe following requirements:

a) The initial energy level in the energy storagedevice or devices shall be that specified bythe manufacturer. It shall be such as toenable the prescribed service braking

1

IS 11852 (Part 6): 2001

performance to be achieved.

b) The storage device or devices shall be dis-connected from the energy source. During thetest the auxiliary service storage device ordevices shall be isolated.

4 CAPACITY OF ENERGY SOURCES

4.1 General

4.1.1 Starting from the ambient atmospheric pressure,the energy source shall be capable of achieving in theenergy storage device or devices, in three minutes,the initial level specified in 3.2.2(a). In the case of amotor vehicle to which the coupling of a trailer isauthorized the time taken to achieve that level in theconditions specified in 4.2 below shall not exceed sixminutes.

4.2 Conditions of Measurement

4.2.1 The speed in revolutions per minute (rPm) ofthe vacuum source shall be as given below:

a) Where the vacuum source is the vehicle en-

b)

c)

gine itself the engine speed obtained with thevehicle being stationary, the gear in neutraIand the engine idling;

Where the vacuum source is a pump, the en-gine speed obtained with the engine runningat 65 percent of the revolutions per minutecorresponding to its maximum power output;and

Where the vacuum source is a pump and en-gine is~quipped with a governor, the speedobtained with the engine running at 65 per-cent of the maximum speed allowed by thegovernor.

4.2.2 Where it is intended to couple to the motorvehicle a trailer whose service braking system isvacuum operate~ the trailer shall be represented byan energy storage device having a capacity’ V’in litresdetermined by the formula

V=15R

where R is the maximum permissible mass, in tome,on the axles of the trailer.

ANNEX A

(Foreword)

COMMITTEE COMPOSITION

Chairman

SHRIR.C.%-m

MembersSHIUN.KURUPPAIAH1

Automotive Braking System Sectional Committee, TED 4

Representing

VRm Ahmdnagar

SHSIK. SENIHILKUMARJ (Akrnaw to

ShriR.C. Sethi)!?MINVUAYKUMAR

SHRIRAJFSHGOYAL(~~tefn~e)

SHIUR. R. G. MENON

.%FOB. GHOSH

SHRIM. S. C)OALE(~hefnate)

SHIUT. M. BALAMUAN

SHIUC. Y. I)EsHmNDE(t4kernate)

SHRIv.s.vmKAmSANSHRIK. N. BALM (Alternate)

SHIUH.CHANOntAMANISHRIR. M. KANnKAR(A/temate)

SHRJD. G. SHRXE

SHRIV. R kiiAoNKAR(i4ker?wte)

AlliedN@pcmL@ New Delhi

AshokLey!sn(iL.@ChennaiAutomotiveReseamhAssociationof Indiq Pune

Baja-iAutoL@ Pune

BrakesIndiaL~ Chcnnai

B@&TempoLtd,Pune

CentralInstituteofRosdTrsnspo~ Pune

(Continued onpoge 3)

2

(Confinuedfrom page 2)

Members

IS 11852 (Part 6): 2001

Repm.wnting

SHIOD. K. Srruw

SHroD. Cwmmum (Alternate)StooDmw.mTVAC1

SHJOD. DoOrm (A/femafe)

Sw S. VIWATATESH

Smo S.JAYAKw (Alremate)sHros.Rub4AswAMv

DR V. G.NAIK(Alfemafe)

SHRIHwrr SINGH

SHIUR. K. JAIN(Ahemafe)

SHRIJ. S. W-

SHWVmoo R.Ku~ (Alternate)Smo V. R M/&mm

Smu P.V. Bmmuw (A[iernate)SmuR.SWAKW

SHIG1.v.RAoSmuDEEPAKsAWtWR(AiteMOte)

SHIUv.c.MAIHURSHRIB. N.DAS(Alternate)

SHIOK. V. R+v@-DYSHIOM. K. MISHSA

SmuR. G. ILwMoi@ (Akrnafe)

Smu V.R KuuwmSHIUs.RAa’rmATHAN(lmrnate)

SmoS.N.SamwwmWooV.MutuxiN (Aherrrate)

sHIov.RAmKmmmSHRIS. M. IQBAL(A/@nate)

SHstvmwMAmurlStnuY.V.NAGARM(AlteMU@

SHRIP.D. JosroS!-nuC.M. MSHTA(Alternate)

Stnu L. S. JAYARAMAN

Stau V. R J.wwrummm (Alternate I)Swu K.N. Ww (Alternate11)

SHRIs.SELVAMANIStooMmxwtM. HFDGE(AkeMtie)

Smu S. R AGARHARJ

StnuV. R Pm-mm

SmoG.RNAGABIIUSHAN(Aknate)SHIOM. N. MUMUCIOSHNA

SW( AmoN F~wSHIUPAUMtAtEDWIN(Alternate)

SHIOK. C. JAIN

SHIUR, IL GUPTA(Alternate)SriruA.R Gum,

Dkector& Head(TED)

Controllaate ofQuaMyAsauraocc(vehicles), Jabrdpur

DacwooMotoraIndiaLt4 Dadri

EicberMotorsL@IWampur

H~ Compdes Ltd,Murnbai

HMTLtd(TractorDivision),Pinjore

KalyaniBrakesLtd,Punt

KineticEnginccringL@Punt

Mahindra& MahindraLq NaaikMarutiUdyogLt4 Ourgaon

Mnistry of HeavyInduatxicaandPublicEnter@e& Dq@rncnt of HeavyInduatica,NcwDelbi

Wdatry of SurfaccTranapo~New DelhiOrdnamxFactoryBoard,Calcutta

Pal-PeugeotL@ Dombivli (East),T%anc

PrernierAutomobilesLtd.Mumbai

RancBrakeLiigs Lti Chcnnai

RoyedEn6eldM~Cbcnnai

scooterIndiaLtd,Kanpur

SundramBmkeLiningsLtd.Clrcnnai

SundnurrClaytonL@ Clrcnnai

SwamjMazdaL@ M*TELco.Pune

TVS Suzuki LtclHoaurVolvo IodiaPvtL@ Bangrdorc

WmahaMotorkortsLtdj Faridabad

DircctorGeneral,91S (Er-o@cioA4ember)

Member-&ct@~

SwuA. K NAOPALDirector(T’ED),BIS

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

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Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaffirmed when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from DOC : No. TED 4 (235).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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