Some brake pads have wear indicators that make noise once the get to a
certain low point. When you hear the noise you get your ass to a shop and
have them replaced before the rotors are trashed. I think you should have
them inspected by a competent mechanic.
Agree with the other poster. But please note that my son's 2002 Elantra
also makes a whistle. His has turned out to be the A/C compressor, running
when the setting is on either "hi-lo" or defrost. I know the A/C does run
on those settings, but had never before noticed the whistle when he would be
using the A/C in the Summertime.
Doubt this helps, but it is something I noticed.
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