If DOT 4 is easily available in your area go with it - it is slightly higher temp than DOT 3 But if DOT 3 is more available then use it.
Unless you drive pretty hard you won't notice the difference.

 

Both are available and I am not running the coupe very hard.

Thanks

Greg

 

Dot 3 and 4 are essentially the same thing. You won't notice a difference between the two of them. Stay away from Dot5 though. Its a racing fluid that needs to be changed before/after every race. Its also not compatible with Dot3/4.

 

Thanks for the info on the DOT5.

Greg

 

Quote]Stay away from Dot5 though. Its a racing fluid that needs to be changed before/after every race.[Quote


Bull$#!t, I have used DOT 5 in my 68 for over 5 years, as have many others.
Athough you are correct about its incompatability with DOT 3 & 4.

 

One must completely and properly flush the entire brake system before the switch or seal damage might/will occur. DOT5 is also not compatible with ABS and doesn't damage paint due to it being silicone based.

Proper flushing link

 

OK. After reading the how to on proper flushing I think I will keep this project simple and go with the original DOT 3. Excellent write up.

Thanks
Greg

 

Whoa - easy! Time out! You're all 'right'. The difference is DOT 5 and DOT 5.1 - way different. However, if your easy choice is 3 or 4, then 4 as it's compatible, easy to find, and less hygroscopic (attracts less moisture). True, you won't feel any difference, but you'll have less corrosion over the long term.

David

 

This one time use brake fluid is making me giggle my ass off!

What the hell is that all about?

DO your brake LINES get hot when slowing down from a 200 MPH run once every two hours?

Or does the heat soak from a run or two of stopping make the fluid heat up and expand ad lock the caliper?
Whatever happens this sounds really stupid and I cannot fathom the reason. SO please one of you Racers school me in this retarded sounding brake fluid change after each race.

 

In the case of my cars, the drivers are hitting the gas and brake at the same time, ala left foot braking. The pedal will loose its stiffness noticeably after a weekend of racing. Keeping the pedal stiff is very important when racing a blind course in order to keep the drivers' confidence in the car up. Confidence = faster times; more podiums.

Besides, we get it for free.