Trailer brake fluid

[schwartzman]

I can't find what type of brake fluid to put in my trailer, there is no making on the cap. I'm guessing DOT 3. I have a 98 Outback and a boat mate trailer. The reason I want to change the fluid is that last summer my friend had a brake issue on the way to our holiday and $800. later he was on his way. Because his fluid was so contaminated the master cylinder was really rusty and dirty inside and the whole unit had to be replaced. I would rather give mine a good flush (the fluid looks clean under the cap) now so I don't have to take time from ski season to work on it.

[mustangairchair]

dot 3 is whats in it you can go to dot4 but you have it flush out all the 3 they don't mix

[oshelton]

Stick with DOT-3. It is the recommended fluid and readily available.

[zegm]

Castrol LMA Dot 4!!!
Not as expensive as some of the other synthetics.
Why not go to a Better Fluid when $40K is behind you. Especially if you are only talking a dollar or two more a bottle???


http://www.castrol.com/castrol/sectiongenericarticle.do?categoryId=9012213&contentId=7024043

[sloppy]

Use DOT 3. The boiling point is not as high but it draws in less moisture. DOT 4 will get contaminated quicker.