DOT 5 Brake Fluid

I'm converting the brake system in my 66 to the 67 style set up. my question is everything will be new so instead of the dot 3 fluid can i convert over to the dot 5 without any problems?

Many DOT 5 fluids are silicone based and may not be compatible with the rubber components and in your brake system. Need to make sure you stick with one fluid base whatever you do; the two different bases (even residual) are not compatible. Most of the DOT 4 fluids are more than you will ever need for the street. IF you plan on getting your brakes red hot, then look at the DOT 5 fluids. The key to having good brake fluid is changing it every couple of years. It attracks moisture which degrades the capabilities of the fluid. Check the wet and dry heat ratings of the fluid to determine the best. They are not all the same. DOT 3, DOT4, and DOT 5 are minimum standards, they are not all the same. I personally use Valvoline DOT 4 or Mercedes Benz DOT 4+.

yes you will be ok. if everything is new than you are ok.

they just came out with synthetic dot 4. but 5 is good to go.

Thanks, What is the difference between the 4 & 5?

Thanks, What is the difference between the 4 & 5?

Read this:

http://www.stoptech.com/tech_info/wp_brakefluid_1a.shtml

Read this:

http://www.stoptech.com/tech_info/wp_brakefluid_1a.shtml

Very good article! Good reading on the 5.1 fluids. Now I know why MB calls their fluid 4+.

Dot 3,4 it's a good idea to flush the system every couple of years to get out the attracted and accumulated water. You won't have much if any water/moisture problem with dot 5 and many (including myself) have run the stuff for years with flushing or any problems connected to same.

Some will advise it's absolutely necessary to clean off all the Dot 3-4 (glycol based) assembly fluid (and relube with Dot 5) that's in your new or rebuilt calipers or cylinders to avoid contamination to the Dot 5. I haven't personally found this to be necessary but I WOULDN'T mix any measurable quantity of the two dissimilar fluids together.

Two advantages to the Dot 5. You can expect extended service life from your cylinders and calipers due to minimal moisture accumulation and there is NO paint damage involved on your car in case of a spill. Those who have had an expensive paint job ruined by Dot 3,4 understand this point very well.