For extended high heat applications like driving on mountainous roads, track racing or towing trailer, in most cases, metallics/semi-metallics are better. My theory is that this is mainly because ceramics physical qualities by nature. While they dust less and make less noise then metallics/semi metallics, they tend to retain the heat longer than metallic, so during heavy braking, they tend to fade more or possibly fail completely. That is why ceramics are not usually recommended for trucks. Think about when you turn off the heat on something like Corning Ware's Visions cookware vs metal cookware. The ceramic ones retain their heat longer and metal ones cool off faster.
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No, but in many respects (such as in brake pads) it's actually better than metal.
The caliper holds 2 brake pads in
Yes. I use them in my vechicles and i get an average of 60,000km from them and the price is right.
Brake rotors wear just as brake pads do and when they wear down beyond minimum specs they become unsafe. Good brakes are a # 1 priority.
There really is no set time or even mileage. If good quality brake pads and s hoes are fitted, they will last a long time. Most disc brake pads have 'squealer' plates, these are thin tin plates that screech when your pads need to be replaced. I like to keep a good eye on all essential features of my car, so I take off the wheels and check my pads and shoes at least twice a year.