BS ISO 4925:2020
$167.15
Road vehicles. Specification of non-petroleum-based brake fluids for hydraulic systems
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 34 |
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).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | Introduction |
| 9 | 1 Scope 2 Normative references |
| 10 | 3 Terms and definitions 4 Materials 5 Specifications |
| 12 | 6 Test methods 6.1 Viscosity 6.1.1 General 6.1.2 Repeatability (single analyst) 6.1.3 Reproducibility (multi-laboratory) |
| 13 | 6.2 Equilibrium reflux boiling point (ERBP) 6.2.1 General 6.2.2 Preparation of apparatus 6.2.3 Test procedure 6.2.4 Repeatability (single analyst) 6.2.5 Reproducibility (multi-laboratory) |
| 14 | 6.2.6 Wet ERBP test |
| 17 | 6.3 pH 6.4 Fluid stability 6.4.1 High-temperature stability |
| 18 | 6.4.2 Chemical stability 6.5 Corrosion 6.5.1 Metal strip characteristics prior to testing 6.5.2 Preparation of joints |
| 19 | 6.5.3 Test procedure 6.6 Fluidity and appearance at low temperatures 6.6.1 At −40 °C for 144 h 6.6.2 At −50 °C for 6 h |
| 20 | 6.7 Water tolerance 6.7.1 At −40 °C for 22 h 6.7.2 At 60 °C for 22 h 6.8 Compatibility/miscibility with ISO 4926 fluid 6.8.1 At −40 °C for 22 h 6.8.2 At 60 °C for 22 h 6.9 Resistance to oxidation |
| 21 | 6.10 Effect on rubber 6.10.1 Test procedures |
| 22 | 6.10.2 Repeatability (single analyst) 6.10.3 Reproducibility (multi-laboratory) 6.11 Reserve alkalinity according to ASTM D 1121 |
| 23 | Annex A (normative) ISO styrene-butadiene rubber (SBR) brake cups for testing brake fluid |
| 26 | Annex B (normative) Corrosion test strips |
| 27 | Annex C (informative) Corrosion strip assembly |
| 28 | Annex D (normative) Standard ethylene, propylene and diene (EPDM) terpolymer rubber slabstock |
| 30 | Annex E (normative) Triethylene glycol monomethyl ether (TEGME) brake fluid grade |
