My little writing on brake repair
Pay attention if your brake light goes on when your emergency brake is disengaged, as this is another indication that your brake fluid is low and your brakes may need repair. Take note, too, that you should not automatically have your brake fluid topped off just because your brakes are being repaired. Fluid levels are supposed to run a bit on the low side so that your brakes can wear properly. If you are noticing shaking, squealing or grinding when you use the brake, these are also signs that you should be looking into brake repair soon. Those signs are designed as a warning system for you to look into repairing your brakes and they should not be ignored.