DOT3 vs DOT4 vs DOT5
- Brake Fluids Explained
Selecting the correct and most appropriate brake fluid comes hand in hand with
how good your brakes work under all situations and circumstances.
Polyglycol Based DOT3 - Color - Amber
| One of the most common finds on the market and have a specific for cars
designed for the late 80s period. Although compatible with our CL7/9s should
you cannot find the required selected grade, this is not the correct
specification to be used from factory recommendation guidelines. DOT3 also absorbs moisture
the quickest and has the lowest boiling point and should only strictly be for
Polyglycol Based DOT4 - Color - Amber
| The benchmark specifications by the majority of car manufacturers, this is
also the specific grade to be used with Hondas/Acura cars regardless of models.
DOT4 is designed to absorb
moisture slower than DOT3 and has a higher boiling point. This is both suitable
for road use and track work. While the OEM Honda DOT4 brakes fluid is
sufficient for weekend trackdays, meets etc. Using racing specific DOT4 refined brake fluids
will increase higher temperature tolerance particularly under hard braking
DO NOT USE! Silicone Based DOT5 - Color - Purple | Least common and also the
most different from both grades above. DOT5 are primarily designed for cars not
equipped with ABS units (Unless otherwise manufacturer specific) and this
should not be used unless you're absolutely sure of what you're doing. DOT5
does not absorb moisture and holds the highest boiling point. This brake fluid
is not compatible with either categories above and should never be mixed due to
it's chemical properties.
Always take care when handling brake fluid as this will corrode body paint work
in a matter of seconds if contact is made. Should accidental spills or drips
happen, immediately flush affected surface area with high spraying water and
wipe off area.
Should you choose to switch to a higher category or quality grade brake fluid,
it is strongly recommended that you perform a complete brake fluid flush. Never
use a mineral or synthetic based oil ala engine oil or transmission fluid in
substitute of specific designed brake fluid. Such incompatibility will cause
all rubber components in the brake hydraulic system to swell up and leak.