ISO 4925:2020
(Main)Road vehicles — Specification of non-petroleum-based brake fluids for hydraulic systems
Road vehicles — Specification of non-petroleum-based brake fluids for hydraulic systems
This document provides the specifications, requirements and test methods, for non-petroleum-based fluids used in road-vehicle hydraulic brake and clutch systems that are designed for use with such fluids and equipped with seals, cups or double-lipped type gland seals made of styrene-butadiene rubber (SBR) and ethylene-propylene elastomer (EPDM).
Véhicules routiers — Spécifications pour liquides de frein à base non pétrolière pour systèmes hydrauliques
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INTERNATIONAL ISO
STANDARD 4925
Third edition
2020-07
Road vehicles — Specification of non-
petroleum-based brake fluids for
hydraulic systems
Véhicules routiers — Spécifications pour liquides de frein à base non
pétrolière pour systèmes hydrauliques
Reference number
ISO 4925:2020(E)
©
ISO 2020
---------------------- Page: 1 ----------------------
ISO 4925:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 4925:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Materials . 2
5 Specifications . 2
6 Test methods . 4
6.1 Viscosity . 4
6.1.1 General. 4
6.1.2 Repeatability (single analyst) . 4
6.1.3 Reproducibility (multi-laboratory). 4
6.2 Equilibrium reflux boiling point (ERBP) . 5
6.2.1 General. 5
6.2.2 Preparation of apparatus . 5
6.2.3 Test procedure . 5
6.2.4 Repeatability (single analyst) . 5
6.2.5 Reproducibility (multi-laboratory). 5
6.2.6 Wet ERBP test . 6
6.3 pH .
...
DRAFT INTERNATIONAL STANDARD
ISO/DIS 4925
ISO/TC 22/SC 33 Secretariat: DIN
Voting begins on: Voting terminates on:
2019-12-20 2020-03-13
Road vehicles — Specification of non-petroleum-base
brake fluids for hydraulic systems
Véhicules routiers — Spécifications pour liquides de frein à base non pétrolière pour systèmes hydrauliques
ICS: 75.120; 43.040.40
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 4925:2019(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2019
---------------------- Page: 1 ----------------------
ISO/DIS 4925:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 4925:2019(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Materials . 2
4 Specifications . 2
5 Test methods . 4
5.1 Viscosity . 4
5.1.1 General. 4
5.1.2 Repeatability (single analyst) . 4
5.1.3 Reproducibility (multi-laboratory). 4
5.2 Equilibrium reflux boiling point (ERBP) . 4
5.2.1 General. 4
5.2.2 Preparation of apparatus . 5
5.2.3 Test procedure .
...
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