Mark offers some excellent advice here.

To expand, I personally would not want to ever go out on a limb and
"recommend" any vehicle, used or new, to a friend or relative. I might
tell them that my own experiences have been positive and that Consumer
Reports says that the car has a better than average repair history, etc.,
but I would leave it at that and encourage them to do their own research.

Many of us who has ever recommended something to someone else know how
easily these "personal recommendations" can backfire and come back to
haunt us. That is especially true with a used car.

My opinion, and please take it for what it's worth, is that you're setting
yourself up to drive a wedge in your relationship with your brother if the
car turns out to be a lemon.

Furthermore, to digress a little more, I would tell anyone considering
selling -their- car to a friend or relative, to never do it. At least not
directly. Put a dealership in the middle of any such deal. If you're
buying a new car and have a buyer already set up to take your trade-in,
most dealers will welcome you with open arms, even if there's a
pre-arranged price that's below market. First of all by doing this you'll
capture the tax credit for yourself (assuming you're replacing the car
you're selling). More importantly, by having a dealership in the middle
you acquire a layer of insulation from hard feelings (and liability) if
the car suddenly starts having problems or someone gets hurt because of a
mechanical breakdown. i.e., "don't blame me, I didn't sell it to you,
discuss your issues with the dealer."