high pitch squell not in engine or brakes must go above 25mph?

high pitch squell not in engine or brakes must go above 25mphsquell is still there when traveling at 25 and above. Replaced the brakes front and rear. While traveling shut down engine but squell was still there. Believe it is coming from front end but not sure because it is so high pitched. Put new tires on about 3 months ago.

I removed the wheels and brakes from the front lifted the van and mine still does it!! Also noticeed if you steer slightly of center while on the highway noise goes away. NOTE I only have 30,000 mlies on ours

you can get your breaks worked on

check if the correct size cabin filter is in.