Brake fluid
Race Director
Joined: Dec 2013
Posts: 12,502
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Your fine, but would still power flush the system to just have one type of fluid in the system.
Dot 4 has a higher boiling point, while Dot 3 will absorb humidity out of the air at a slower boiling point instead.
As for Dot 4, tend to advice street guys, and some auto cross guys to use Preston Dot 4 on the C6. It has the highest boiling out of all the less expensive type dot 4 fluids. So under $14 for a quart of it, verse some race type dot 4 fluid with higher boiling point that would cost $80 per quart of instead.
Note, I use about a quart of fluid when doing a power flush of the brake system, including cycling the ABS pump to get the old fluid out of it as well.
https://www.lelandwest.com/brake-flu...ison-chart.cfm
To add, service manual calls out for the brake fluid to be power flushed every 2 years, and on most C6's, have not been power flush in over 10 years, with the old brake fluid saturated with water to cause corrosion problems inside the brake system instead.
Dot 4 has a higher boiling point, while Dot 3 will absorb humidity out of the air at a slower boiling point instead.
As for Dot 4, tend to advice street guys, and some auto cross guys to use Preston Dot 4 on the C6. It has the highest boiling out of all the less expensive type dot 4 fluids. So under $14 for a quart of it, verse some race type dot 4 fluid with higher boiling point that would cost $80 per quart of instead.
Note, I use about a quart of fluid when doing a power flush of the brake system, including cycling the ABS pump to get the old fluid out of it as well.
https://www.lelandwest.com/brake-flu...ison-chart.cfm
To add, service manual calls out for the brake fluid to be power flushed every 2 years, and on most C6's, have not been power flush in over 10 years, with the old brake fluid saturated with water to cause corrosion problems inside the brake system instead.
Last edited by Dano523; Mar 16, 2021 at 02:53 PM.
