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Brakes perform a vital function for the driver and need to be well maintained to work at their best. The brake caliper, brake pads, and brake rotor are the primary components of car disc brake systems. The brake pads and rotors on all cars wear out eventually, but brake wear varies based on a number of factors, including:
Driving habits: How hard a driver pushes their brakes greatly affects how long the brake pads last. Some drivers ride the brakes and stop abruptly, while others gently coast to a stop. Smooth, gradual braking increases pad lifespan, but of course it's important to brake abruptly when safety calls for it.
Environment: Due to stop-and-go traffic and traffic lights, driving in the city is harder on brakes than driving out in the country or on long straight roads because braking is required less frequently. Driving in mountainous areas with steep elevation changes can wear brakes out quickly as well, because it's often necessary to ride the brakes to control downhill speed.
Brake pad hardness: Brake pads are available in different compounds to suit different driving needs. Hard compound brake pads last longer, but usually need to be warm before they perform well, and are more common on performance cars. Soft compound brake pads perform better at low speeds, like in urban areas. Too much heat can melt pad compound onto the brake rotor and reduce brake performance if the driving gets too extreme.
Materials: The materials that make up the brake rotor and brake pad also factor into the brakes’ durability. Carbon-ceramic brakes last longer than standard metal brakes, for instance, but they need to be warmer than the alternative to be effective. However, carbon-ceramic brakes are extremely expensive and found almost exclusively on high-performance sports cars. Steel or other metal brakes are much more common and still more than adequate to suit a variety of driving conditions.
How to tell if your brakes need replacing
Generally, brake pads need to be replaced after about 50,000 miles. Some need to be replaced after 25,000, while others can last for 70,000 miles – it all depends on the factors listed above. To get a more accurate number for your car’s specific needs, consult the owner's manual. Other warning signs communicate that the brake pads are wearing out, including:
Squealing or scraping noise. Brake pads have small metal hairs at the very bottom to let the driver know when they are about to run out of grippy material; they start making a squealing noise. Replace immediately.
Jittery braking. If braking becomes jittery then the rotors may be warped. Some treatments can either clean or grind down the surface of the rotor in order to make it flat again. Most of the time though, it is easier, less expensive, and safer to just replace the brake rotor.
If the brakes look worn out or lose performance, they should be replaced. If there are any unusual noises or sparks coming from the brakes, have them inspected by a mechanic right away. Good, functional brakes are key to safe, predictable braking and safe motoring!
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