Please be careful, you can't use a higher DOT than the system was designed for as I understand it. My parts dealer told me that I cannot just put in any DOT, when I was buying for my motorcycle, he said that it may react with the rubber and other items in the system, I assumed I shouldn't use 4 instead of 5, but he said 5 instead of 4 is bad too. Just my 2 cents of course, but now I think I will research this a bit more to find out why, unless anyone here knows ???
******************Correction**********************
It appears that DOT5 is a silicone fluid and IS NOT compatible with DOT3 and 4, so if you had 3 or 4 in the system you would have to evacuate ALL of it first, and then it may still have absorbed into the rubber. Apparently using a higher DOT than the system is designed for can cause the whole brake system to fail instead of fade as a DOT3 system is not designed to run at the temps that DOT4 fluid will allow, etc...
DOT2 was for brake drum systems and is now obsolete.
MAN, it pays to read !
Check this out for the nitty gritty on brake fluids http://www.motorcycleproject.com/mot...rakefluid.html WOW! Who knew there was that much to it?