Bsi bs au 174 1 1979 (2000) iso 4926 1978

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BRITIS H S TAND ARD AUTO MO BILE S E RIE S

BS AU
1 74 -1 : 1 979
IS O 4 92 6: 1 978

H ydraulic b rake
systems, using
non-petroleum b ase
b rake fluids, for road
vehicles —
Part 1 : Specification for non-petroleum
base reference fluids

[IS O title : Road ve hicle s — H ydraulic b rake syste ms —
Non-p etrole um b ase reference fluids]

UD C 62 9 . 1 1 3 – 5 9 2 . 2 : 62 0 . 1 6


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BS AU 1 74-1 :1 979

National foreword

This Part of this British Standard has been prepared under the direction of the
Rubber Standards Committee in consultation with the Automobile Standards
Committee. It is identical with ISO 4926 “Road vehicles — Hydraulic brake

systems — Non-petroleum base reference fluids ”.

This is Part 1 of BS AU 1 74 which covers components for vehicle braking
systems using non- petroleum base fluids. It is intended to issue other Parts
specifying non- petroleum base brake fluid and cups, boots and seals for use
in the braking system.
An associated British Standard will specify similar components for vehicle
braking systems using petroleum base fluids.
In drafting this series of British Standards full consideration has been given
to the work of subcommittee TC 22/SC2 of the International Organization for
Standardization (ISO) .
Terminology and conventions. The text of the International Standard

has been approved as suitable for publication, without deviation, as a
British Standard. 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 throughout as a decimal marker. In
British Standards it is current practice to use a full point on the baseline
as the decimal marker.
Where 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.

This British Standard, having
been prepared under the

Summary of pages

direction of the Rubber
Standards Committee in

This document comprises a front cover, an inside front cover, pages i and ii,

consultation with the

pages 1 and 2 and a back cover.

Automobile Standards
Committee, was published

This standard has been updated (see copyright date) and may have had

under the authority of the

amendments incorporated. This will be indicated in the amendment table on

Executive Board and

the inside front cover.

comes into effect on
31 October 1 979
© BSI 02- 2000

Amendments issued since publication

The following BSI references

Amd. No.

relate to the work on this
standard:
Committee reference RUC/40
Draft for comment 76/5451 9 DC

ISBN 0 5 80 1 0872 4

1)

Originally prepared under

Committee reference PTC/9

1)

Date of issue

Comments


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BS AU 1 74-1 :1 979

Contents

Page
National foreword

© BSI 02 - 2 000

Inside front cover

1

Scope and field of application

1

2

ISO compatib ility fluid — composition

1

3

ISO fluid for storage corrosion test

2

4

Availab ility

2

i


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ii

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BS AU 1 74-1 :1 979

1 Scope and field of application

This International Standard specifies the composition and some characteristics of two reference fluids used
for the testing of hydraulic braking systems and components mounted on road vehicles.
2 ISO compatibility fluid — composition
Item

1
2
3
4
5
6
7
8
9

10
11
12
13
14
15
16
17
18
19
20
21
22
23
24

Constituent

Monoethyl ether of diethylene glycol
Monobutyl ether of diethylene glycol
Methyl ether of tripropylene glycol
Polyalkylene oxide triol, kinematic viscosity 200 ± 10 cSta at 38 °C, relative
density 20/20 °C 1,064
Ethylene glycol
Diethylene glycol
Propylene glycol
Methyl isobutyl carbinol
Polypropylene glycol, average molecular mass 2 025
Polypropylene glycol, average molecular mass 150
Propylene glycol monoricinoleate

Reacted castor oil — polypropylene glycol
2-Methyl, 2,4 pentanediol
Monobutyl ether 1,2 oxyethylene, 1,2 oxypropylene glycols, relative
density 20/20 °C 1,058, kinematic viscosity 440 ± 22 cSta at 38 °C
Monobutyl ether 1,2 oxyethylene, 1,2 oxypropylene glycols, relative
density 20/20 °C 1,038, kinematic viscosity 56,5 ± 3 cSta at 38°C
Borax-ethylene glycol condensate (25 % sodium tetraborate, anhydrous)
Diphenylol propane
Sodium nitrate
Sodium tetraborate
Potassium tetraborate
Tricresyl phosphate
Amino imidazoline salt 33 % solution
Potassium castor oil soap (neutral-anhydrous)
N-phenylmorpholine

C omposition

mass %

51,70
2,26
5,12
5,30
2,47
1,34
2,45
4,30
2,30
1,30

3,30
1,90
2,80
3,16
8,85
0,25
0,53
0,01
0,10
0,18
0,10
0,01
0,18
0,09

NOTE Item 4: Glycerine initiated triol using charges of 50 % ethylene oxide and 50 % propylene oxide.
Items 14 and 15: Butanol initiated monoether using charges of 50 % ethylene oxide and 50 % propylene oxide.
a 1 cSt = 1 mm 2/s. A recommended submultiple of the SI unit (m 2/s) for kinematic viscosity is the mm2 /s. In practice the
centistokes (cSt) is generally used.

© BSI 02-2000

1


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BS AU 1 74-1 :1 979

3 ISO fluid for storage corrosion test

3.1 Composition
Item

1
2
3
4
5
6

C onstituent

Castor oil
Diethylene glycol monomethyl ether
Ethylene glycol monobutyl ether
Borax-glycol condensate
Di- t-butyl- p-cresol
m-Cresol

C omposition

mass %

38,7 ± 1,0
31,4 ± 0,5
27,3 ± 0,5
2,1 ± 0,2
0,475 ± 0,050
0,025 ± 0,005

NOTE Items 2, 3, 5: The diethylene glycol monomethyl ether, ethylene glycol monobutyl ether, and di- t-butyl- p -cresol shall be
technical grade.
Item 4: The borax-glycol condensate shall be 30 parts by mass of sodium borate decahydrate (Na2B4O 7.10H2O) combined
with 100 parts by mass of 1,2 propylene glycol.
3.2 Physical and chemical requirements

Boiling point at 101,3 kPa
pH value
Relative density 20/20 °C

167 to 186 °C
9,9 to 10,7
0,962 0 to 0,968 0

4 Availability

The two above fluids can be obtained from the Society of Automotive Engineers, Inc., 400 Commonwealth
Drive, Warrendale, Pa. 15096 U.S.A. or from the Laboratoire de recherches et de contrơle du
caoutchouc 12, rue Carvés, 92120-Montrouge, FRANCE.

2

© BSI 02-2000


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BS AU
1 74-1 :1 979
ISO 4926:1 978

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