When to replace brake pads: 5 warning signs you should not ignore


The high pitched squeal when braking comes from the metal wear indicator touching the rotor: about 3 mm of friction material is left. A deep grinding noise and a cloud of black dust mean the material is gone and the steel backing plate is rubbing on the rotor, which will probably need replacing too.
A pulsing pedal or a shaking steering wheel when braking reveals a warped rotor or uneven wear; a longer pedal or a vehicle pulling to one side points to a sticking caliper or air in the lines. These symptoms are rarely fixed by changing pads alone.
The best time for an inspection is the seasonal tire changeover, when the wheels are already off: the installer measures the pads and rotor thickness at no extra charge. A pads and rotors kit per axle, installed at the same time, costs less than two visits.
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