Brake oil is used by hydraulic braking
systems of automobiles. Read to know the characteristics of brake oil
and when to replace it.
Automobile braking systems work on hydraulics and a
lubricating fluid called brake oil is necessary for them to function.
Brake oil over the years has evolved greatly to ensure better operation
and reliability of the system. The different types of brake oils
according to their application include grades like DOT 3, DOT 4, DOT 5
and DOT 5.1. These types of brake oil listed correspond to their boiling
points as they work in very high temperature and pressure environments.
DOT 3 and DOT 4 brake oils are most commonly used in both India and
internationally.
The boiling point of brake
oil needs to be high to avoid vapourisation, as vapour is compressible
and will hamper the effectiveness of a hydraulic system. Vapour in the
hydraulic system will also result in pressure differences which in the
case of brake oil can cause problems like juddering. This can also cause
uneven pressure differences in the brake system and can lead in
rupturing of the brake lines. Over time, due to moisture content in the
atmosphere brake oil absorbs moisture. The boiling point of brake oil
after absorbing moisture is known as its wet boiling point.
DOT 3, DOT 4 and DOT 5.1
are able to absorb water to an extent (hygroscopic) under normal
humidity levels. DOT 5 is silicon based and cannot absorb water
(non-hygroscopic). DOT 5 brake oil is not compatible with anti-lock
braking systems. Silicone brake oil, which contains additives that
prevent the oil from becoming sludgy under low temperatures, is used in
very cold climates.
Most modern cars, if not
all, come with brake fluid reservoirs that allow one to see through so
you can check on the level of brake fluid without physically opening the
cap. Usually, the reservoir is located on the engine firewall or
towards the back of the engine bay towards the driver’s side. The
reservoir is also higher up in the engine bay so that it is easily
accessible. Once you locate the reservoir, it is easy to identify
certain markings on it to know if you need to fill more brake fluid or
if it is at an acceptable level. As the container is in the engine bay
and is often exposed to elements like grime, heat and oil, one might
need to clean off a little grime on it to ensure correct levels.
Brake oil must be changed
every two years as the oil gets saturated with moisture. The moisture
content can also corrode seals and metal inside the braking system. Old
brake oil is flushed out completely and replaced with new oil. Always
remember to bleed the brake system of all air bubbles before using the
car. Forgetting to bleed the brake system can lead to catastrophic brake
failure and can result in an accident.
Ensure an adequate level
of brake oil is refilled according to the marking on the container
located in the engine bay. If the level drops, top up with the grade of
brake oil recommended by the car manufacturer. Also visit to the
authorized workshop for checking & functioning of brake system as
there may be chances of leakage in the hydraulic system. Always
remember to thoroughly clean the rim of the container and the cap
before putting it back on to ensure no stray particles enter the
reservoir. Do not use brake oil from an opened bottle as it will have
absorbed moisture from the atmosphere. Wash off any brake oil residue
that might have spilled in the engine bay while refilling as it can
corrode the paint.
Talk to us at Shreenath Hyundai for more Details on
Hyundai Cars Sevice in Mumbai. Contact us Shreenath Hyundai @ Andheri 022 6688 7777 | Chembur 022 6193 9393 | Thane 022 2584 6666
