brake fluid
Drifting
Joined: Jan 2004
Posts: 1,468
Likes: 223
From: Sherman CT
2023 C3 of the Year Finalist - Unmodified
2019 C3 of Year Finalist (stock)
St. Jude Donor '24-'25-'26
Burning Brakes
Joined: Jun 2004
Posts: 872
Likes: 3
From: Cortlandt Manor New York
If you want to add brake fluid you need to know what is in there first. Silicone brake fluid does not mix with DOT3. If you change types of fluid you need to drain and flush the brake lines. The advantage of silicone is that it doesn't absorb water.
That being said i have used DOT3 for 30 years without ever having a problem. I just change the fluid every 2 years.
That being said i have used DOT3 for 30 years without ever having a problem. I just change the fluid every 2 years.
Le Mans Master
Joined: Mar 2001
Posts: 6,640
Likes: 287
From: Ann Arbor Michigan
Thread Starter
Intermediate
Joined: May 2009
Posts: 37
Likes: 0
From: Houston Texas
If you want to add brake fluid you need to know what is in there first. Silicone brake fluid does not mix with DOT3. If you change types of fluid you need to drain and flush the brake lines. The advantage of silicone is that it doesn't absorb water.
That being said i have used DOT3 for 30 years without ever having a problem. I just change the fluid every 2 years.
That being said i have used DOT3 for 30 years without ever having a problem. I just change the fluid every 2 years.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
Keep it the same as your manual describes, unless your brake system has been thoroughly purged of all previous fluid and you put a tag on the top cover to your M/C calling out what fluid you have in it. Otherwise, some yo-yo at a repair shop or quick-lube place will do you an nice 'favor' and top off your M/C with the wrong fluid. 
Thread Starter
Intermediate
Joined: May 2009
Posts: 37
Likes: 0
From: Houston Texas
Keep it the same as your manual describes, unless your brake system has been thoroughly purged of all previous fluid and you put a tag on the top cover to your M/C calling out what fluid you have in it. Otherwise, some yo-yo at a repair shop or quick-lube place will do you an nice 'favor' and top off your M/C with the wrong fluid.
as i said before there is NO, zero, nada brake fluid in there!! if there is it is at the bottom rock hard. we will be blowing out the brake lines and replacing the rubber lines. so no worries about that.
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Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
"Blowing" through the brake lines will not purge them. You must completely flush the lines with a product that will eliminate the existing brake fluid completely. If you don't get it all out, you are risking contaminating the system and future problem. That's why I offered the "caution" to you. You asked...I provided my input. Use it or not.....
Thread Starter
Intermediate
Joined: May 2009
Posts: 37
Likes: 0
From: Houston Texas
"Blowing" through the brake lines will not purge them. You must completely flush the lines with a product that will eliminate the existing brake fluid completely. If you don't get it all out, you are risking contaminating the system and future problem. That's why I offered the "caution" to you. You asked...I provided my input. Use it or not.....
we pulled of the bleeder valves off of the rear caliper and there was not any thing left...? can anyone explain? I didnt think that hydraulic fluid could evaporate?
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN