Thread:

Duramax Brake Fluid Service.

What does this entail? Suck out the fluid, replace with new then bleed the brakes to get the old fluid out of the lines? Thanks

what I usually do is use a power bleeder- can be as simple as a converted hudson sprayer
(that's what my blue-point one is) or you can use a vacuum style. either way, just don't
let the master go dry- just bleed all 4 corners untill you have nice clear brake fluid coming
out the bleeder screws, and your done!

So basically you are just bleeding the brakes to get fresh fluid at the wheels.

My manual says to use Dot 3. Can I use Dot 4? Is it better? Does it matter?

Originally Posted by Luvnlife

My manual says to use Dot 3. Can I use Dot 4? Is it better? Does it matter?

Better not mix them, differance in the formulation, silicone or something or some other additives. Somebody out here will know more about this than I do. Havent screwed with brake systems in a few years,the stuff I have now is all air brakes.

Originally Posted by jorndy

Better not mix them, differance in the formulation, silicone or something or some other additives. Somebody out here will know more about this than I do. Havent screwed with brake systems in a few years,the stuff I have now is all air brakes.

Even if I'm changing out all the fluid, resevoir and lines?

Originally Posted by Beer:30

Dot 3 and 4 are fine to mix. Just don't mix dot FIVE (5), which is SILICONE. They don't mix at all. I have used them all and have settled into the Valvoline Dot 4 SYNTHETIC. Real nice stuff. Still bubbles paint, so be careful.

Thanks Beer. I went to three places looking for some good quality brake fluid but all they had was 3 in cheap offname brands. Probably all the same stuff anyway Guess I'll try one of those good stores like PepBoys