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   Home > Auto resources > Glossary of Automotive Terms

 Brake Fluid

The brake system uses a glycol-based hydraulic fluid. The fluid is "hygroscopic," which means it tends to absorb moisture over time. 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. DOT 5 brake fluid is different from DOT 3 and DOT 4 in that it is silicone-based.

May we suggest: 
| Automatic Transmission Fluid (ATF) | Power Steering Fluid |

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