Noises that point to wear
Many brake pads have a built-in wear indicator that makes a high-pitched squeal when the pads get thin. A deep grinding or scraping sound is more serious. It can mean the pads are worn through and metal is contacting metal, which can damage the rotors.
Some squeaks happen in damp weather and fade after a few stops. A noise that is constant or getting worse deserves a look.
Changes in how the pedal feels
A pedal that feels soft, sinks toward the floor, or needs more effort than before can point to a problem in the hydraulic system, such as air or a leak in the brake lines or low fluid. Do not put this off.
A pulsing pedal or a shaking steering wheel when braking often means rotors that have worn unevenly.
Other warning signs
Watch for the car pulling to one side when you brake, a brake warning light on the dash, a burning smell after heavy braking, or a longer stopping distance than usual.
Brake fluid should also be checked from time to time, since it absorbs moisture over the years. Your manual lists a suggested schedule.
Do not wait for symptoms
A brake inspection during routine service, such as a tire rotation, lets a technician measure pad thickness and check rotors, lines, and fluid. Catching wear early usually means a simpler repair.
