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Consider changing brake fluid at 30,000 miles or during brake pad
replacement |
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Types of Brake fluid
The most popular brake fluids used in
today's cars are DOT
3 and DOT 4, both of which are clear to amber in color.
Sometimes used is DOT 5 fluid which can be recognized by it's purple color. DOT
5 fluids are typically silicone-based. DOT 3 and DOT 4 fluids
are polyglycol.
Hydraulic system mineral oil brake fluid [HSMO] is a blend of mineral oil
and additives. It is the most rare, the most expensive, and is not compatible with any
other fluids.
Difference in fluids:
DOT 3 and DOT 4 have an affinity for moisture
causing both the reduction of the boiling point and also
rust and corrosion problems in the brake system. Dot 5 fluid can withstand
very high temperatures and has no affinity to moisture. However, it is higher in price and
it's air retention properties make it difficult to bleed air from the brake system. It
is not used in cars equipped with ABS because of this. HSMO has the
highest boiling point, and it does not contribute to rust or corrosion. HSMO
can be idenified by it's green color. No other fluid can be used in cars
equipped with this
fluid.
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Change Brake Fluid:
Many drivers overlook this critical fluid, believing that
if the car stops, the brake system is operating properly. In our shop we recommend
the fluid be changed each 30,000 miles or sooner if the fluid has a dark color;
which seems to indicate the presence of moisture.
Boiling point
Brake fluid is subjected to very high
temperatures, especially in the
wheel cylinders
of drum brakes and disk brake calipers. It must have a high boiling
point to avoid vaporizing in the lines. This vaporization is a problem
because vapor is compressible and negates hydraulic fluid transfer of
braking force. Stop and go driving, mountain driving and "riding" the
brakes will cause brake temperatures of several hundred degrees.
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