Check the lubrication for the sliding disc brake caliper. It's a cheaper design, but most vehicles have these. The brake caliper only has one piston, and the entire caliper must slide when brakes are applied in order to "grab" the disc evenly. Sometimes the sliding caliper doesn't center itself, and one of the brake pads is lightly touching the disc and squealing. When you apply the brakes, both brake pads are pushed onto the disc, and the noise stops. Sliding calipers are usually lubricated when the front wheel bearings are serviced.
Alternately, your brake pads are worn, and you may have a little "scraper" that is just beginning to touch the disc. These things are to alert you that the brake pads are worn and need replacing.
Originally Posted by boverton
Sometimes when going down the road I get a loud "squealing" from around the right front wheel. Stops when I apply the brake. Then when I let off the brake it returns. Sometimes it stops completely. Any thoughts. Thank you.