Other Car Fluids

Castrol Brake Fluid DOT 4

VISCOSITY - Maintenance & Repair

Castrol Brake Fluid DOT 4


Castrol Brake Fluid DOT4 is a high-boiling synthetic brake fluid which far exceeds the requirements of the SAE J1703, SAE J1704, FMVSS 116 DOT 4, ISO 4925 and Jis K 2233 specifications. This brake fluid is designed for use in all brake systems particularly those which are exposed to extreme conditions.


Castrol’s brake fluid has been formulated from mixed polyalkylene glycol ethers and borate esters together with other high-performance additives and inhibitors which give ultimate system protection against the effects of corrosion and high-temperature vapour lock. The formulation has been developed such that the vapour lock point can be sustained at a higher level than conventional glycol ether-based fluids during the service life of the product. Castrol’s DOT4 brake fluid is fully compatible with other fluids meeting FMVSS 116 DOT3 and DOT4 however, to maintain the superior performance characteristics of Castrol Brake Fluid DOT4, avoid mixing with other brake fluids products. All conventional brake fluids deteriorate during use. It is strongly recommended that Castrol’s DOT4 Brake Fluid be changed according to the vehicle manufacturer’s advice. In the absence of such advice, a 2-year change period is recommended. As with all brake fluids which contain glycol ethers, care should be taken to avoid spilling this product on paintwork as it may have a damaging effect. In case of spillage rinse the affected area with water immediately. Do not wipe.

NameMethodUnitsCastrol Brake Fluid DOT4
AppearanceVisualClear and bright yellow liquid
Density @ 20CIP 160g/ml1.07
ERBP (Equilibrium Reflux Boiling Point)ASTM D1120°C260
Viscosity, Kinematic -40CIP 71mm²/s1200
Wet Equilibrium Reflux Boiling PointSAE J1703°C165
pHSAE J1703pH8.0
Water contentASTM D1123%0.15

ISO 4925 Class 4
JASO JIS K2233 Class 4
SAE J1703
SAE J1704
AS 1960.1-2005 Grade 2


Conditions of Use:
Castrol Brake Fluid DOT4 should not be used in braking systems for which a mineral oil based fluid is recommended (for example some Citroen systems for which Castrol LHM plus is suitable and Rolls Royce vehicles for which Castrol CHSMO Plus is approved. Storage All packages should be stored under cover. Where outside storage is unavoidable drums should be laid horizontally to avoid the possible ingress of water and the obliteration of drum markings. Products should not be stored above 60°C, exposed to hot sun or freezing conditions.

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Castrol Brake Fluid DOT4
12 x 1L

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