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9 votes
Accepted

Mixing DOT 4 with DOT 4 synthetic

The information & links posted by Paulster2 offer excellent explanation of what the various types of brake fluid are. There are a few grade : DOT3 DOT4 DOT5 DOT5.1 The difference between ...
9 votes
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What is the difference between DOT4 and DOT5 brake fluid?

For everyone's edification, here are the dry/wet boiling point specifications for the different brake fluids: Dry boiling point Wet boiling point DOT 3 205 °C (401 °F) 140 °C (...
8 votes

What is the difference between DOT4 and DOT5 brake fluid?

The biggest advantage to DOT5 brake fluid is that it is hydrophobic meaning it doesn't like water. This is in contrast to DOT 3, 4, 5.1 which are hygroscopic which means it will absorb water even just ...
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7 votes

Mixing DOT 4 with DOT 4 synthetic

I found this description of synthetic based brake fluids. According to the page, all brake fluids are technically "synthetic" in that they are man made and do not contain a petroleum base. "Synthetic"...
6 votes

Can I put DOT 4 brake fluid into DOT 3 brake?

You can absolutely use DOT4 in place of DOT3 brake fluid. The only thing you'll need to do is completely purge the system of the old DOT3 fluid to take advantage of the DOT4 features (higher boiling ...
4 votes

Mixing DOT 4 with DOT 4 synthetic

DOT 3, 4 AND 5.1 can be mixed. They are compatible. None of them are compatible with DOT 5 that's silicone-based. I just bought some Motul DOT 5.1 and it says on the front label: "NON-SILICONE base ...
3 votes

Mixing DOT 4 with DOT 4 synthetic

Manufacturers have been labeling their DOT3 and DOT4 products as "synthetic" as many consumers associate this with higher performance or quality similar to motor oil. But ALL brake fluids can be ...
3 votes

what is the difference between DOT3 and DOT4 brake fluids?

DOT 5 is silicone based and is no way compatible. Dot 5.1 is sort of OK but not recommended to mix with 3 and 4. To use Dot 5, you MUST replace all rubbers, seals and flex brake lines as well as ...
3 votes
Accepted

Is it ok to mix different clutch fluid color?

EDIT EDIT of my not being able to read: From the 96 Civic owners manual: "use Genuine Honda Brake Fluid or an equivalent from a sealed container that is marked DOT3 or DOT4 only. Brake fluid ...
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2 votes

Why don't car brake systems generally use mineral oil as brake fluid?

The Bosch Automotive Handbook confirms that mineral-oil-based fluids are not hygroscopic: Mineral-oil fluids (ISO 7308) The great advantage of mineral-oil-based fluids is the fact that they are not ...
  • 39k
1 vote

Recommended brake fluid type for 2012 Ford Focus

The only difference between the two is the boiling point of the fluid, with DOT4 having a higher range. You could use either and get away with it, but if the cap on the master cylinder states it ...
1 vote

2005 Montero LTD — Brake Warning Light - Intermittent

A couple of things here. First, when I find the brake reservoir low, I will look at my disk brakes to ensure the pads aren't shot (or nearly worn out). Usually, if worn enough, the fluid level will ...
1 vote

2005 Montero LTD — Brake Warning Light - Intermittent

Dot 4 supercedes Dot 3. If you put Dot 4 in, no problem. Basically, Dot 4 can go in and replace Dot 3, chances are you already have Dot 3 in anyway. Wikipedia, Dot 4: While a vehicle that uses ...
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