One of my passengers isolated the sound to the left rear wheel. I
checked the sheet metal splash guard? that hugs the inside of the
brake rotor and did find any objects. I checked it by pulling in or
out on it and listening and feeling for blockage or objects.

That noise that the wheel makes when reverse sounds like violin string
vibration more than the vague 'eeeeeeeeeee' I described earlier.

What's odd is the asymmetry of the sound, if indeed it is coming from
the same wheel in both directions. Why a rustling or scraping sound
when moving forward and a violin string vibration should moving
backward, if rocks or rust? And why doesn't the friction just scrape
away the whatever by now?

Maybe it is the brake pad or something with brake caliper. I'll have
to bring it into the shop when I get a chance.

(I would take the wheel apart myself to inspect but I have the
facility or torque wrench to put the tire back properly.)

On Apr 5, 3:53 pm, Tegger <teg...@tegger.c0m> wrote:
> minnow <min...@gmail.com> wrote innews:b7199d6e-dab4-4ec3-9f1b-8bd02ad4b941@2g2000hsn.googlegroups.com:
>
> > Thanks for all replies, it is most likely brake related. Friend just
> > told me he has heard my brakes and thought I knew about it. Unless
> > the sound of the brake wear indicator has changed between my first two
> > sets or my hearing is shot, I don't hear that characteristic screech
> > on (forward) braking, so I like the rock theory.
>
> > I just gunned the engine in park and didn't notice the noise at all --
> > the problem is motion related.
>
> If the noise increases and decreases in direct relation to car speed, it's
> almost certainly brake related.
>
> You're in the DC area it appears. Don't know how much rain/snow you get in
> winter, so the following may not apply.
>
> A common source of the noise you describe is rust on the perimeter of the
> rotor. This builds up, eventually contacting the slide shims on the pad
> mount bracket. The contact is not uniform, so you get a chk-chk-chk sort of
> noise. To see if this is the case, you need to pull the pads and shims off,
> and look for bright scuff marks on the shims.
>
> See here for a photo of that, almost all the way down at the bottom of that
> page.
> <http://www.tegger.com/hondafaq/rustybrakes/moredetail/brakes2_detail....>
>
> --
> Tegger
>
> The Unofficial Honda/Acura FAQwww.tegger.com/hondafaq/