Our strategy is simple - we are dedicated to making refractometers useful instruments that are easy for people, not scientists, to understand and use.

Other Points of Interest

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DOT3 Fluid Tester
DOT4 Fluid Tester
Engine Coolant Tester

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MISCO Refractometer
3401 Virginia Road
Cleveland, OH 44122

Toll Free 800-358-1100
Phone 216-831-1000
Fax 216-831-1195
Email info@misco.com

copyright © MISCO 2004

When To Change Your Brake Fluid

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Generally, the type of driving should influence when to change brake fluid. If the vehicle is used for towing, driving in mountainous regions, driven at high speeds or has ABS brakes, it would be best to change the fluid at 2% water content. All vehicles should have the brake fluid changed when the water exceeds 3%.

	Condition	Water Content	Boiling Point (F)	Boiling Point (C)
DOT3	OK	Less Than 2%	Above 356	Above 180
	Borderline	2% to 3%	320 to 356	160 to 180
	Change	Greater than 3%	Less than 320	Less than 160

DOT3 High Temp	OK	Less Than 2%	Above 374	Above 190
	Borderline	2% to 3%	320 to 374	160 to 190
	Change	Greater than 3%	Less than 320	Less than 160

DOT4	OK	Less Than 2%	Above 410	Above 210
	Borderline	2% to 3%	369 to 410	187 to 210
	Change	Greater than 3%	Less than 320	Less than 187

Super DOT4	OK	Less Than 2%	Above 414	Above 212
	Borderline	2% to 3%	374 to 414	190 to 212
	Change	Greater than 3%	Less than 374	Less than 190

Many motor vehicle companies recommend changing brake fluid every 12 months, others recommend changing every 24 months. The amount of moisture that brake fluid absorbs depends on a number of factors including the type of fluid, humidity, type of brake hoses, condition of the seals and mileage.

Generally, brake fluid will absorb 1% or more moisture per year of service life. A two year old car will have 2-3% water in the brake fluid. 2% water reduces the boiling point of DOT3 brake fluid by approximately 135 degrees Fahrenheit (75 degrees Celsius). 2% water in DOT4 brake fluid reduces boiling point by 81 degrees Fahrenheit (45 degrees Celsius).

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