Your brakes will tell you they're worn before they fail. Here's what to listen — and feel — for.
Grinding When You Stop
Metal on metal. If you hear grinding when you apply the brakes, the pads are gone and the rotor is taking damage. At this point you're past a pad replacement — you need new rotors too. Don't keep driving it.
Squealing (the Warning Before Grinding)
Most brake pads have a small metal wear indicator tab built in, designed to contact the rotor and squeal when the pad gets thin. That sound is intentional. It's the warning you get before the grinding starts.
Squealing doesn't always mean immediate danger, but it means you're close. Get them looked at within the week.
Pulsing or Vibrating When You Brake
The pedal should feel firm and steady when you stop. If it pulses — if you feel a rhythmic vibration through the pedal or the steering wheel while braking — the rotor is warped.
Rotors warp from uneven heat distribution, usually from repeated hard stops or driving with worn pads for too long. The rotor develops high and low spots, and that's what you're feeling. Resurfacing works on minor warping. Most of the time you're replacing the rotor.
Pulling to One Side
If the car pulls left or right when you brake — not just in general driving, specifically when braking — one side isn't doing its share. Usually a sticking caliper or uneven pad wear. Left alone, this gets worse and becomes a handling issue beyond just the brakes.
Soft or Spongy Pedal
The brake pedal should feel firm. If it feels soft — if you have to push it further down than usual to get the car to stop, or if it slowly sinks toward the floor — that's air in the brake lines or a fluid leak. This is the one symptom on this list that can fail suddenly.
Don't drive it. Get it looked at the same day.
The BRAKE Warning Light
Not the tire pressure light, not the battery light — the BRAKE light specifically. On most vehicles, that light means low brake fluid. Brake fluid doesn't evaporate. If it's low, either there's a leak somewhere in the system or the pads are so worn that the caliper has extended so far it's drawn the reservoir down. Either way, something needs attention.
The Bottom Line
If you're reading this because your brakes are making a noise, that's your answer. If you're reading it to see if it's bad enough yet — it is.