I have a 2002 Civic EX with ABS. Approximately 10,000km's (6,000
miles) and 6 months ago the reservoir for the break fluid was at the
Minimum level, I refilled the reservoir to the max line and now it is
at the Minimum level again. This is the first car that I've owned
with ABS so I'm wondering if this is normal.

Also, does the type of break fluid that I use have any impact on
breaking performance. I was at my local automotive shop and noticed
the following types of break fluid, DOT3, DOT4, and DOT3 for ABS. Does
it matter which one I use?

Thanks!