Toilets

So my clutch reservoir cap has DOT 4 on it. Does this mean GM put DOT 4 brake fluid for the brakes and clutch?? IE, meaning I don't need to change out the fluid before my track event from DOT 3 to DOT 4

JackTripper

Yes, I use Castol GTX Dot4 Brake fluid for my clutch.

AzDave47

I use Prestone DOT4, $5 at Wally world

Toilets

What I am trying to say is, if it's true there is DOT 4 fluid in the car from the factory then why are people changing it right away?

AzDave47

Many of the C6 Z06's clutch fluid was black in the reservoir within a short time of build and did it through it's life. Did Chevy fix this on the C7's?. Maybe not, thus change the fluid as best you can.

dvandentop

is the hydraulics in the c7 as prone to getting dirty as quick as c6 was? havent seen c7 slave cylinder pics yet

Gary '09 C6

is there a factory-installed remote bleeder valve for the C7 slave ?
or is it a similar set-up to that of the C6 (hard to access) ?

Toilets

Ok what I was trying to say is, is the brake fluid DOT 3 or DOT 4? Normally (like the c6) it was the same fluid from the factory as the clutch fluid therefore, since the clutch resevior says DOT 4 on it, can we assume the brake fluid is also DOT 4?

lawdogg149

No. The brakes are dot3 and the clutch dot4. This is stupid of them.

Toilets

Crap. Was hoping I didn't have to change the fluid before my first event.

lawdogg149

Manual also says only use dot3 in the brakes. So i dont know.

AzDave47

Given the manual stating DOT 3, I think you can count on the brakes having DOT 3 fluid.

Based on my C6 Z06 road circuit track experience, I would highly recommend Motul RBF 600 brake fluid for the braking system. Regardless of brand, go with a brake fluid (not Silicone) with a dry boiling point of 600* or higher. They will likely be DOT 4.

I use the Prestone DOT 4 for the clutch as it is much cheaper than the 600* DOT 4's, but has a lower boiling point. I have not had any clutch fluid problems (drag racers may have had those problems) with boiling, etc, but did with the brakes with fluid under 600* boiling point.

occar

For the 600 degree fluids, technically they're DOT 5.1 (not to be confused with silicone based DOT 5). Well. DOT 5.1 fluid also meets DOT 4 and DOT 3 standards.

ZL-1

Track use requires changing to brake fluid with a higher boiling point but GM continues to specify dot 3 for street use because it is less prone to absorb moisture than dot 4*

*this was mentioned at a Bash seminar but there are conflicting reports on the hygroscopic qualities of dot 3 vs dot 4.


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AzDave47

That probably is the case but the Motul RBF 600 lists it as DOT 4 on the container, although the dry boiling point is 592* or some number just less than 600*.