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<p>[QUOTE=&quot;Tee+, post: 903335, member: 62296&quot;]The U.S. Department of Transportation issues specifications for brake fluid. The three main types of brake fluid now available are DOT3, DOT4 and DOT5. DOT3 and DOT4 are glycol-based fluids, and DOT5 is silicon-based. The main difference is that DOT3 and DOT4 absorb water, while DOT5 doesn&#039;t. </p><p><br /></p><p>One of the important characteristics of brake fluid is its boiling point. Hydraulic systems rely on an incompressible fluid to transmit force. Liquids are generally incompressible while gases are compressible. If the brake fluid boils (becomes a gas), it will lose most of its ability to transmit force. This may partially or completely disable the brakes. To make matters worse, the only time you are likely to boil your brake fluid is during a period of prolonged braking, such a drive down a mountain -- certainly not the best time for brake failure! </p><p><br /></p><p>As a DOT3 or DOT4 brake fluid absorbs water, its boiling point decreases. It can absorb water from the air, which is why you should avoid opening your car&#039;s brake fluid reservoir. For the same reason, you should always keep containers of brake fluid tightly sealed. </p><p><br /></p><p>DOT5 fluid does not absorb water. This means the boiling point will remain relatively stable, but it also means that any water that does get into your brake system will tend to form pure water pockets, which could cause brake corrosion. </p><p><br /></p><p>Two other important things about brake fluid: DOT3 and DOT4 eat paint, so don&#039;t spill it on your car. Also, none of the different types of brake fluid should be mixed. They can react badly with each other and corrode your brake system. </p><p><br /></p><p>?ѹ??? ?ҡ autorepair </p><p><br /></p><p>The brake system uses a glycol-based hydraulic fluid. The fluid is &quot;hygroscopic,&quot; which means it tends to absorb moisture over time (never leave a can of brake fluid open for this reason). Moisture lowers the boiling point of the fluid and causes internal corrosion in the brake system. That?s why the fluid should be replaced when brake repairs are made or every two years for preventive maintenance. There are several different types, based on the boiling temperature and other characteristics of the fluid. DOT 3 or DOT 4 is used in most passenger cars and light trucks. Use only the type of fluid specified by the vehicle manufacturer. Using DOT 3 in an application that calls for DOT 4 might create a safety hazard. DOT 5 brake fluid is different from DOT 3 and DOT 4 in that it is silicone-based. DOT 5 is NOT recommended for any vehicle equipped with antilock brakes - but it can provide long-lasting protection against corrosion for vehicles that are stored for long periods of time or are driven in wet environments.[/QUOTE]</p><p><br /></p>

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