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4. Problems when you slam on the brakes.
Most car shoppers don’t slam on a car’s brakes out of courtesy, but they are potentially missing out on catching a mechanical issue before making a purchase. Problems like the vehicle shuddering uncontrollably, loud squealing or grinding, pulling to one side or the other, etc. are all indications a used car has mechanical problems. Also pay attention to whether the brake pedal feels squishy or firm since squishy can indicate a problem with the brake system.