VAC Motorsports can tell you, Castrol SRF Racing brake fluid is the benchmark performer!
Castrol SRF wet and dry boiling point exceed all the competition and surpass everything else
available for the serious race and track car. We have used SRF in all of our seriously tracked and raced vehicles
for years.
The cost is high but this is the max performance choice when coming in first
is the goal!
Castrol SRF Specifications:
Dry Boiling Point - 590 °F
Wet Boiling Point - 518 °F
Fully compatible with ABS braking systems.
Safe for all non-mineral oil-based disc and drum brake systems
Meets or exceeds all DOT 4 specsNow sold in (1 liter) plastic bottles.
VAC Tech Tips:
-SRF with its very high wet boiling point can be used on a street vehicle.
-SRF can be mixed with DOT3 and 4 HOWEVER, NEVER do this on a race vehicle, this is only for the emergency situation of a street vehicle that needs to be topped off.
This will degrade performance to the lower fluids.
-SRF is to be flushed and
refilled at least every 18 months
Info from Castrol:
Castrol SRF Racing Brake Fluid is an ultra high performance product formulated specifically to satisfy the
ever increasing stresses placed upon the braking systems used in international motorsport. The
exceptional performance of Castrol SRF is due to a novel silicon ester technology pioneered by Castrol
and unique to the extent that it has been granted patent-protection in numerous countries throughout the
world.
Castrol SRF evolved as a direct result of Castrol's ongoing Research and Development program for brake
fluids which identified this silicon ester technology as providing considerable performance benefits when
compared with conventional glycol ether borate ester fluids.
Following exhaustive laboratory tests at Castrol's International Technology Centre in the UK, the final
formulation for Castrol SRF was subjected to an extensive road-test programme on the Gross Glockner
and Stelvio passes high in the Austrian and Italian Alps. It then underwent an independent track test
program conducted by a famous Formula One racing team. Their assessment was that "Castrol SRF is the
best racing brake fluid we have ever used."
Subsequently, Castrol SRF was offered to top flight racing and rally teams throughout the world including
most of the Formula One teams, the all-conquering Jaguar and Mercedes -Benz sports car teams and the
Audi, Nissan and Toyota rally teams. Enthusiastic recommendation by these experts soon created an
immense interest in Castrol SRF throughout the whole spectrum of national and international motorsport.
Today, Castrol SRF is regarded by the international motorsport community as being without equal and it is
chosen not only by factory-supported teams but by private competitors throughout the world.
All conventional brake fluids used in cars and motor cycles are hygroscopic, that is, they absorb water
from their surroundings. Strange though it may seem, the flexible hoses incorporated in braking systems
are permeable to water and in time enough, water can find its way into the system via the hoses, and
seriously affect the brake fluid's performance. This water reduces the boiling point of the fluid (ie, it lowers
the temperature at which gas bubbles begin to form). When these bubbles form, they turn a virtually
incompressible liquid into a mixture of gas and liquid which can be compressed quite considerably, thus
severely reducing the efficiency of the brakes. In this situation, a driver finds that the brakes feel spongy.
Brake-pedal travel will increase and it may be necessary to 'pump' the pedal to get the brakes to function
effectively. However, when the brake fluid reaches a temperature at which the water in the fluid causes gas
to be produced, which is equal to the volume swept by the piston in the rake master-cylinder, vapor-lock
occurs and the brakes become inoperative. When this happens, the first indication the driver has that
something is wrong is when he applies the brakes. The pedal goes down to the floor and the car carries on
at undiminished - and possibly fatal speed.
The silicon ester technology in Castrol SRF addresses this problem in two ways. Firstly, Castrol SRF is
less hygroscopic than conventional brake fluids - it absorbs less water in a given time. Secondly, unlike
conventional glycol ether fluids, Castrol SRF reacts chemically with the absorbed water to reduce its
adverse effects, thus preventing the fluid's high temperature performance and safety margins from
deteriorating as rapidly as they would otherwise do.
Castrol SRF exceeds the US Federal Standards FMVSS 116 DOT 3 and DOT 4, ISO 4925, JIS K2233 and
current SAE J1703 and is miscible with all conventional brake fluids conforming to these standards.
However, mixing Castrol SRF and conventional brake fluids will reduce the benefits of Castrol SRF. It is
strongly recommended that conventional brake fluid be drained from the system before flushing and refilling
with Castrol SRF.
The wet boiling point of Castrol SRF, 270 C, is vastly superior to the minimum requirement of 155 C
demanded by the current US DOT 4 specification. The product's typical dry boiling point of 310 C is
likewise outstanding. This ability to withstand temperatures in excess of 300 C, and its superior resistance
to the effects of absorbed water, have established Castrol SRF as the world's premier fluid for the hydraulic
brakes used in all forms of motorsport.
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