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Performance Engine Oils
Castrol React SRF Racing Dot 3 & 4 Car Brake Fluid

Castrol React SRF Racing Dot 3 & 4 Car Brake Fluid


Castrol SRF Racing Brake Fluid - 1 Litre

1 Litre


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  • Description
  • Benefits
  • Specifications
  • Shipping Explained

Castrol React SRF Racing Dot 3 & 4 Car Brake Fluid

General Details:

SpecificationFMVSS 116 DOT 3
SpecificationFMVSS 116 DOT 4
SpecificationISO 4925
SpecificationJASO JIS K2233
SpecificationSAE J1703
for components see parts list

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Castrol React SRF Racing brake fluid is a high performance brake fluid of special value in competitive motor sport where extreme braking conditions are encountered. It is an exclusive Castrol product registered under patents in many countries. Castrol React SRF Racing exceeds US Federal Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925, JIS K2233 and current SAE J 1703 specifications.

Castrol React SRF has been especially formulated to maximise braking performance under arduous competitive conditions. In order to achieve the optimum benefits in such applications, advanced materials have been employed in a unique and patented Castrol formulation. The use of Castrol React SRF should be restricted to not more than eighteen months before draining and refilling for maximum efficiency. Prolonged use in excess of the recommended period may give rise to a deterioration in performance at very low temperatures. Castrol SRF is suitable for all disc and drum brake systems with the exception of those for which mineral oil is prescribed.

PDF Downloads:

Download the Technical PDFDownload the Safety PDF


The exceptionally high dry boiling point, (higher than 300oC) makes Castrol React SRF ideal for use under arduous braking conditions such as racing or rallying.

Castrol React SRF has a very high vapour lock point (the more important measure of high temperature performance under actual braking conditions), and has the additional advantage of sustaining high vapour lock point characteristics during its service life. The compressibility of Castrol React SRF is very similar to that of current DOT 3 and DOT 4 fluids. It can, therefore, be filled into any non-mineral oil braking system. Castrol React SRF is miscible with all conventional fluids meeting US Federal Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925 and current J 1703. However, mixing Castrol SRF and conventional brake fluids will merely reduce the higher quality of Castrol SRF. It is, therefore, recommended that conventional brake fluids be drained from the system before flushing and refilling with Castrol React SRF.


  • Castrol SRF
    • Exceeds US Federal Standards FMVSS 116 DOT 3
    • DOT 4, ISO 4925, JIS K2233
    • SAE J 1703 & SAE J 1704
    • SAE J1703
    • FMVSS 116 DOT 3 & 4


SHIPPING IS FREE* for orders of £75 and over , regardless of the weight of your order.
We've tried to keep all other shipping costs as low as we can.

Carriage starts at just £0.95 (inc VAT) for small items, with our most common courier rate set at £5.99 for orders of 5kg (enough for 5 litres of oil).

  • *Free shipping is available for UK Royal Mail, UPS Access Point™ (click & collect) and standard UK courier services (not express / priority / islands).
  • Courier surcharges mean we are unable to offer free "to the door" courier shipping from us in Cornwall up to Highlands / Grampian in Scotland - and because we send a lot of liquids, not every courier option is available to us. UPS Access Point™ (click & collect) is available as a free shipping option across Scotland, Wales and England, wherever there is a UPS Access Point™ Location.
  • Carriage charges are based on weight - please see our table of carriage costs for full details (although adding an item to your cart and viewing the calculated carriage is often easier!).
  • Priority shipping is also available.

How long will it take to get my order?

We give an estimate of delivery dates as you shop and in your basket. The vast majority of items are held in stock and dispatched from our UK warehouse and we'll do all we can to get your order to you as quickly as possible.

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"It does not get better... the reason this oil is used by Formula 1!"