This is a sign that air has entered the brakes lines and is preventing the brake fluid from flowing through this system effectively. Sponginess - the brake pedal feels spongy and the brakes seem unresponsive.
An inspection can identify the precise reason for the vehicle pulling to one side. Pulling - if your car pulls to the left or right when you apply the brakes this is usually indicative of a sticking hydraulic or mechanical component such as a seized caliper. If this only occurs when you apply the brakes firmly, it could just be the ABS kicking in but you should have this checked out if you are concerned or it happens regularly. Pulsation occurs because the brake disc is distorted and no longer provides a perfectly flat surface when the brake pad makes contact. Pulsating - If you feel a continuous pulsating from the brake pedal whenever you apply the brakes, this indicates the brake disc has become warped due to excessive heat. Either way, you should get this checked out.
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It could suggest the brake caliper has stuck and the brakes pad remains partially applied to the disc but some pads have wear indicators that squeal when worn to let the driver know the brakes need changing. Squeaking - there are many reasons why brakes squeal. This will likely damage the brake disc also. Grinding - when the friction material on brake pads are heavily worn, this can result in a grinding noise as the brake pad has worn down to the metal caliper. There are a number of tell-tale signs to look out for when using your brakes