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Your brakes have a few ways of letting you know when brake repair is needed, such as wear indicators that squeal when they start scraping against the turning rotor. An illuminated brake light usually indicates that brake fluid is low, while a strong odor and puddle of amber liquid underneath your car indicates a leak. You can't miss the smell of brake fluid! Vibrating wheels or brake pedals signal rotor surface problems. Your brake wear indicators could be scraping against your rotors if your brakes squeal when you release your brake pedal; however, the grinding and growling sound of metal on metal means that your brake pads have completely worn down. Regardless of the signals your brakes send, take your car in for brake repair as soon as possible.