Castrol React SRF Racing DOT 4 Brake Fluid 1L

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Castrol

Castrol React SRF Racing DOT 4 Brake Fluid 1L

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Castrol React SRF Racing is a competition brake fluid made for heavy braking on track and on rally stages. It boils at 320 °C when new and at 270 °C once it has absorbed water.

Specifications

Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925 Class 4, SAE J1703, JIS K2233 Class 4
Quantity 1 litre
Colour yellow, clear
Brake systems disc and drum, except those that require mineral oil
Change interval 18 months at most

Typical values from the Castrol data sheet

Dry boiling point (ERBP) 320 °C
Wet boiling point 270 °C
Viscosity at -40 °C 1300 mm2/s
Viscosity at 100 °C 3.5 mm2/s
Density at 20 °C 1.066 g/ml
Water content 0.15 %

Why the wet boiling point matters

Brake fluid absorbs water from the air, and water lowers its boiling point. The wet value is measured to SAE J1703, on fluid humidified in the lab. When the fluid boils in the caliper, vapour bubbles form and the pedal goes soft. Castrol states that SRF keeps its high threshold throughout its service life.

Before you fill
  • It mixes with conventional DOT 3 and DOT 4 fluids, but mixing lowers its performance. Castrol advises draining the old fluid and flushing the system before filling
  • Changing it within 18 months keeps the boiling threshold where the data sheet puts it
  • Not for brake systems that require mineral oil
  • Castrol asks for the bottle to be stored under cover, below 60 °C and away from frost

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