DOT 4

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Yes, I would.

I don't believe the DOT3 would do any damageto the system because they are compatable,but it isn't good enough to provide the service needed.

Dot 4 has a higher boiling point, so it can withstand more heat. In an application that requires it, you could loose breaking power by using the lower spec fluid.

The two fluids are completely compatable, so they can be mixed but it lowers the spec to the lower. In other words if you have a DOT 3 system, you can add DOT 4 to it any time, but adding DOT 3 to DOT 4 fluid lowers the capablity to the level of the DOT 3.

You could find yourself in a situation where the brake fluid boils, which would mean a loss of brakes.

I'd flush it thoroughly.

imported post

Foodman wrote:

I see synthetic brake fluid that said it's compatible with ANY brake fluid..
Can this be added to 4 dot ?? anyone

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Yes.

DOT 3 and DOT 4 is the standard technology, so I wouldn't worry.

If it was a DOT 5 system, I think I might be asking some questions.



I have a big bottle of synthetic and it says on it DOT 3 & DOT 4 compatable.

I use synthetic all the time.



I've never seen one say ANYone the label before, so it might be new technology. Either that or it always was compatable and they figured out that it was good advertising.