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Old 12-19-2005   #11
Tom
 
Join Date: Jan 2004
Location: Southern CA
Posts: 108
Default Re: Brake Bleeding Advice

DOT 5.1 is a synthetic non-silicone brake fluid. I use DOT 3 brake fluid and change it once a year. Some track day events require you to have changed the brake fluid within so many days before the event, for example within 30 days of the event, to ensure the fluid has not had time to absorb moisture and reduce the boiling temperatures. You can look up most brake fluids at the manufacturers website and see what the new boiling point is. Different DOT 3's and 4's will have different boiling points, they just have to meet the minimum boiling point.

MINIMAL boiling points for these specifications are as follows:
Boiling Point Ranges
Dry Boiling Point Wet Boiling Point
DOT 3 205°C (401°F) 140°C (284°F)
DOT 4 230°C (446°F) 155°C (311°F)
DOT 5 260°C (500°F) 180°C (356°F)
DOT 5.1 270°C (518°F) 191°C (375°F)

Last edited by Tom; 12-19-2005 at 11:57 AM.
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