Common Damages of Automotive Disc Brakes
The disc brake of a vehicle is the device that slows or stops the rotation of a wheel. However, they don’t always last forever. The four most common ways your disc brakes become damaged is by warping, scarring, cracking, or excessive rusting. Service shops will typically respond to these problems by changing out the discs completely because repairing the abused disc may actually cost more.
Warping is usually caused by excessive heat. When the disc’s friction area is at a higher temperature than the “hat,” or inner portion, thermal expansion takes place in the friction area and not in the inner portion, causing warping to occur. To minimize the likeliness of this occurring, you can use “floating” rotors. These help to decouple the friction area from the inner portion, thus allowing thermal expansion to occur at different rates. Overheating typically happens due to excessive braking, riding the brakes, undersized or oversized brake discs, or a stuck brake pad.
Scarring, also referred to as “scoring,” occurs if the brake pads are not changed when their service life expires. It is extremely important to replace worn out brake pads promptly. When enough of the frictional material is worn away, the pad’s steel backing plate, or pad retainer rivets will reach the rotor’s wear surface. This significantly reduces the car’s braking power and makes scratches on the disc. To prevent from scarring, it is recommended to periodically inspect the brake pads for wear. A prime time to check them is when you rotate your tires.
Usually drilled discs are the only disc brakes that crack. Small cracks sometimes develop around the edges of holes drilled near the disc due to the disc’s uneven rate of expansion, especially when riding heavy duty roads. There is no repair that can fix a cracking but if it becomes a severe crack over time, the disc rotor must be replaced.
Brake discs are commonly made from cast iron. That’s why surface rusting is considered quite normal. Usually, the disc area is kept clean because of regular use. However, a vehicle that sits in a garage or storage unit for some time can develop a large a mount of rust. This decreases the braking power for some time until the car is driven and the rusted layer is worn off. Overall, disc brakes tend to rust a little bit but it’s nothing to worry about if you drive frequently. Cracking usually doesn’t take place and warping and scarring is something you need to keep an eye on. When problems with your disc brakes are consistent or become severe, it is simply time to replace the parts.
About the Author
Get some new disc brakes for your vehicle today and avoid the rusting, the warping, and the scarring at all costs.
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