Not clear what you're specifically talking about. Whether the strokes are "smooth" depends on the specific Art Brush you are using.

The Scale Strokes and Effects setting is buried in the Transformation palette's flyout menu and in General Prefs. That controls whether stroke weights (including those of Brush strokes) scale when the paths are scaled.

If you're talking about those blobs that look like ink blotches at sharp bends, that aberation occurs sometimes depending again on the artwork used to define the Art Brush and the shapes of the paths to which the Brush is applied.

Can't tell what you've got in your screenshot, because the paths are not selected. Also, post an image of the Brush itself.

JET

Infinitely clever guy. Don't get how it works. Even more baffling is how you could come up with it. Who would think of such a workaround?!

Who would think of such a workaround?!

That would be Kurt.

I just am baffled by this I am certain you guys are right but I cannot for the love of me make this bug manifest itself when scaling an object that was created with the brush tool with a calligraphic brush…

so what am I missing here is a video the only thing I did not try was scaling with an Transform effect and the transform panel.

http://mysite.verzon.net/wzphoto/Brush.mov

I, for one, like the leaky style AND your wildly improbable and highly inventive solution for the OP (who obviously doesn't wish to leak).

Do not use a brush just use a stroke but since you have a brush applied to the stroke you have to give it a stroke of none, so you can see what you are doing, then in the appearance panel from the fly out give it a new stroke.

The default stroke will be applied of black, 1pt it will be an even line you can now delete the previous stroke. If the new stroke is too thick or thin you can easily change it in either the stroke panel or the appearance panel.

Save the file.

You can make an artbrush as well

and you might prefer to use the pen tool for drawing such illustrations. Many users do.

Perhaps drawing with the Pencil tool instead of the Brush tool will solve the problem.

I had a similar problem of curved lines drawn with a brush 'blobbing' when zoomed in and lines changing shape after drawing.

After months of talking with Adobe technicians I learned that this problem is the nature of brushes because of Illustrator's limited memory.

It can be reduced by setting the brushes Fidelity and Smoothness preferences to minimum and not zooming in too much.

But drawing with the Pencil tool has eliminated the problem of the "blobbing' effect and of shapes changing after drawing.

And the Pencil tool has more control and is clearer.