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Hence why Glycol brake fluids have dry boiling points and wet boiling points, dry for when new, wet for when some moisture has been absorbed.

In a passenger car this is not a problem however in a race car it is a major issue, due to the boiling point decreasing, the performance ability will also decrease. This absorbed moisture will drastically reduce the boiling point of the fluid. Hence why road car manufacturers recommend changing brake fluid at suggested timed intervals A certain amount of Glycol will absorb a certain amount of moisture within a certain time frame. In fact, it will absorb a tiny amount of water from the moment it has been manufactured and nothing can be done to stop this. Glycol based brake fluid is hygroscopic meaning it has the ability to mix with water and still perform adequately. However this ingredient is not susceptible to boiling. The key ingredient Glycol Ethylene has high lubrication properties to lubricate the rubber parts. Glycol based brake and clutch fluid is that most commonly used within the motor industry. You can get Poly/Glycol Ethylene and Silicon based. Also leaks and air in the system will result in the pedal travelling to far and loose the pressure you have generated to stop the car.Ī very important thing to keep in mind is when you purchase brake fluid they are not all the same. One of the enemies of brake fluid is heat!! If enough heat is transferred into the fluid and is able to boil the fluid this will result in brake fade. The basic premise is the brake fluid is non compressible thus being able to exert the correct force through the brake lines and to the calipers. This brake fluid is the solid / physical connection delivering the force you exert on the brake pedal to the brake calipers. Brake Fluids- Glycol & Silicone explained Brake Fluids What's the difference between Glycol and Silicone based brake fluids?īrake fluid is the precious fluid in a brake system.