What kind of brake fluid?

I have a 1983 Honda Nighthawk 550 that I've been working on and I'm new to the motorcycle scene. What kind of brake fluid would be okay to use?

Dot 3.

Dot3 ot Dot4. Flush the fluid if it looks old.

The requirements are printed on the master cylinder cap.

DOT 3 or 4.

No, No and NO to DOT 5 in that bike. It didn't exist when that bike was made - at least for mere mortals. DOT 5 is silicone based and DOT 3 and 4 are glycol based. They are totally INCOMPATIBLE with each other. While you can use DOT 5 in your Honda, You MUST have All of the glycol based fluid out of the entire system. NOT an easy task.

DOT 5 has a higher boiling point and isn't hygroscopic (absorb water) which makes it suitable for racing systems. You Nighthawk has NO need for this.

Use DOT 3 or 4. Be careful. DOT 3 and 4 brake fluid will eat paint. Don't dribble and if you do, clean up immediately.

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