Hello,
 We all know that DOT 4 is the stuff to use, but the system in my van is
full of DOT 3. I'm replacing the slave cylinder now, figured it's a good
time to flush it, too, and put in the DOT 4. (Plus it should be up to 50
deg next week!). Any suggestions on how thorough I need to flush it? Was
thinking I'll just drain the reservoir, and pump it until its clear...

Cheers,
 Jeff