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Research
Ref No FRX 090905 January 19th, 2006 Page Number 3
maintenance-relatedshopsaswellasfluidtestinglaboratories. Wehavecompiledthesepractices, recommendations and tests to determine fluid condition and posted them in the tables listed below for each fluid.
BrakeFluids
Amongall of thefluidslistedabove,brakefluidoil changerecommendationswerethemost consistent. Brakefluidsareeither DOT 3 or DOT 4 fluidsin North American passenger vehicles. These are polyalkylene glycol (PAG) synthetic fluids. A unique property of this fluid is that it is hygroscopic – it attracts water. The advantage in absorbing water is that it keeps water from collecting in calipers and wheel cylinders. However, by holding onto the water, the brake fluid's boiling point drops, rust inhibitor additives prematurely deplete and the system becomes susceptible to internal corrosion if left too long in the system.
Interval-based Recommendations:
When available, interval-based change recommendations varied from approximately every 25,000 to 35,000 miles or every two to three years for OEMs. Aftermarket articles recommended 15,000 to 60,000 miles or one to three years.
Condition-based Recommendations:
The following standards and documents have been reviewed in determining the condemning limits and recommendations listed below:
1. FMVSS116-FederalMotorVehicleSafetyStandard
2. ISO4925-International Organizationof Standards-RoadVehicles-Specificationof non-petroleum-base brake fluids for hydraulic systems
3. SAE J1703 - Society of Automotive Engineers Service Maintenance of Brake Fluids in Motor VehicleBrakeSystems
4. SA E J1704 - Soci ety of A utomoti ve Engi neers Recommended Practi ce A pri l 2004
5. BorateEster BrakeFluidsSociety of AutomotiveEngineers
6. Herguth Laboratories – Evaluation of Field Test Methods for DOT-3 and DOT-4 Brake Fluids Cleanliness and Fluid Degradation
The comments and recommendations rendered are for general advisory purposes only and intended for the sole use of Fluid Rx. Distribution of copyright protected items is limited. These services are offered by Noria without warranty or liability as to accuracy or completeness of this information.
Noria Corporation 1328 E. 43rd Court Tulsa, OK 74105 918-749-1400