They may not be something you think about very often, but your vehicle's brakes are one feature that should always be in top working condition. Let's look at how to know when you need new brakes.

Have you ever heard a high-pitched screeching sound when you applied your brakes? That's a small metal shim, called an indicator, which is giving you an audible warning that you need to replace your brake pads. You should be aware of this sound. If you hear it regularly, make an appointment with your mechanic.

One exception is if your car has been sitting after being exposed to water, such as from rain or from washing it. The moisture can cause a thin layer of rust to develop on the brake rotors. This is normal. When you first apply the brakes, the pads pressing on the rust-covered rotors may cause a squeal for a few stops until the rust is worn off and then the sound will disappear.

Here are some other signs of brake problems.

Reduced responsiveness or fading. If your brakes are not as responsive as they should be or if the pedal sinks toward the floor, this could be an indication of a leak in the braking system. It could be an air leak (in the brake hose) or a brake fluid leak. One telltale sign of a brake fluid leak is the presence of a small puddle of fluid when the car is parked. Brake fluid looks similar to fresh motor oil, but with a less slimy texture.

Pulling. If your vehicle pulls to one side while braking, it may be a sign that the brake linings are wearing unevenly or that there is foreign matter in the brake fluid. Your vehicle may need a brake adjustment or to have the fluid drained and replaced.

Grinding or growling. This loud metallic sound means that you have worn down the pads completely, most likely beyond replacement. The grinding or growling noise is caused by the two pieces of metal (the disc and the caliper) rubbing together. This can score, or scratch your rotors, creating an uneven surface. If this happens, do not be surprised if your rotors need to be replaced.

Vibration. A vibration or pulsating brake pedal is often a symptom of warped rotors (but can also indicate that your vehicle is out of alignment). The vibration can feel similar to the feedback in the brake pedal during a panic stop in a vehicle equipped with anti-lock brakes.

It is a sign of warped rotors if the vibration occurs during braking situations when the anti-lock brakes are not engaged. The vibration is felt because the brake pads are not able to grab the surface evenly.

For many owners, maintaining the vehicle's brakes is something that is often overlooked. But keeping your brakes properly calibrated and in good working order can prevent costly repairs down the line, and, more importantly, help you avoid a collision.