From my head on precision tune coupons
Brake repair is more a necessary part of good car maintenance than the signal of an automotive problem. Brake pads are intended to alert you to the need for maintenance by scraping and squealing when they have worn down to a certain point, but they are not the only indication that brake repair is warranted. You should check your brake fluid levels when your brake light goes on; this typically indicates that your fluid is low and your brakes should be checked over by a certified technician. If you see or smell brake fluid, get your car to a technician immediately as that indicates the presence of a leak. Rotor surface issues usually manifest themselves through vibrating wheels or brake pedals, and brakes that squeal even after you release the brake pedal mean that your wear indicators are scraping against the rotors.