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FYI-brake fluid

Old Sep 6, 2006
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FYI-brake fluid

ok so i lookd but didnt find one so i thought it would be cool to make one so hear we go ...

there are three main categories of brake fluid: DOT 3,4 and 5.
DOT 5 is synthetic brake fluid. DOT 3 and 4 are fluids made from polyglycol base, similar to that of engine coolent
glycol based fluids are hygroscopic, which means that they absorb water. being hygroscopic is an advantage for brake fluid because it can absorb moisture that enters the system. this prevents the formation of water drops that could boil or freeze.dispersing the moisture throughout the fluid also prevents localized corrosian that could cause holes to form in brake lines.
because brakes produce heat, brake fluid becomes hot. that is why one of the desirable properties of brake fluid is a high boiling temp.
water has a far lower boiling point then brake fluid .if brake fluid absorns enough water ,it can boil in the lines. this can result in a loss of efficiency,a brake pedal that feels "spungy" during applicaton,and evan a total loss of brakes.
DOT 3 fluid has a dry boilling point of 401 F and a wet boiling point of 284 F
DOT 4 fluid has a higher boiling point 446 F dry and 401 F wet
fluid that meets DOT 3 or DOT4 specs can be used in drum an disc systems

ok so about DOT 5 ...

its a synthetic silicone-based brake fluid.the wet boilling point does not come into play however with silicone fluid because it is not hygroscopic.because it does not absorb moisture, it is called a lifetime fluid.also most manufactures recomend it not be used in abs applications. DOT 5 is mostly used in high performance cars or race cars
DOT 5 501 F boiling point dry

ok well there you have it ... if any Q about what i put down post them hear
Old Sep 6, 2006
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http://www.7thgencivic.com/forums/sh...d.php?t=259901
Old Sep 6, 2006
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oh well i tried lol ...
Old Sep 6, 2006
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DOT 5 is not compatible with most street cars. It will eat up the rubber seals inside the system. So DOT 4 is the way to go for higher boiling points.
Old Sep 6, 2006
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Originally Posted by Ichiban
DOT 5 is not compatible with most street cars. It will eat up the rubber seals inside the system. So DOT 4 is the way to go for higher boiling points.
you can use DOT 5 in street cars but you need to flush out the system befor
iam not to sure about eating up the seals and stuff ive never heard such a thing
Old Sep 6, 2006
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you shouldnt ever use DOT 5 in MOST street cars, and NEVER in a civic.
Old Sep 6, 2006
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if DOT 5 ever used in a street car it needs to be flushd out on a reaguler bases because it does not absorb water and the water will find the lowst point in the brake system and start corroding the parts and it is not recomended for use in a abs system in a street car it is always best to go with oem spec
Old Sep 7, 2006
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Question remains, by bother with DOT 5, when a High end DOT4/5.1 fluid has the same boiling temps yet non of the drawbacks?

Example
Motul 600 (DOT 5.1) which has a Dry Boiling Point: 593˚F / Wet Boiling Point: 421˚F

or

ATE Super Blue With a Dry boiling point 280˚C (535˚F). Wet boiling point 200˚C (392˚F)

Hell, Willwood's 570 Brake fluid only holds a DOT3 rateing and it has a Dry Boiling Point - 570°F and a Wet Boiling Point - Wet 284°F

Basically, there's no reason to ever use a DOT5 fluid on a car, raceing or not.
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