How to Fix Squeaky Brakes

What Causes Breaks to Squeak? Don't expect brakes to be totally quiet—sometimes, they're going to make some noises. Don't panic, because a squeaky brake can stop a car just like a silent one can. What causes the squeal? Modern brakes use a cast-iron disc squeezed between two brake pads lined with friction material. Under the right conditions, the disc, the pads and the caliper they're mounted in can start to vibrate—in exactly the same way a violin's string vibrates when stroked by the horsehairs on the bow. Most brake squeals occur at a single discrete frequency. The speed of the vehicle [...]