
A disc brake is a type of brake that uses the calipers to squeeze pairs of pads against a disc or a rotor to create friction. There are two basic types of brake pad friction mechanisms: abrasive friction and adherent friction.
Hydraulically actuated disc brakes are the most commonly used mechanical device for slowing motor vehicles. The principles of a disc brake apply to almost any rotating shaft. The components include the disc, master cylinder, and caliper, which contain at least one cylinder and two brake pads on both sides of the rotating disc.
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Types of Disc Brake
Slotted Disc Brakes
Slotted disc brakes feature shallow channels or slots on the rotor's surface. These slots help dissipate heat and gases generated during braking, improving overall brake performance, particularly in wet or rainy conditions. They also help prevent brake fade, enhancing stopping power and maintaining consistent braking performance over time.
Drilled Disc Brakes
Drilled disc brakes are characterised by holes drilled into the rotor's surface. These holes aid in heat dispersion, reducing the risk of brake fade during intense braking. However, drilled rotors can be more susceptible to cracking under heavy use, so they are often favoured in applications where weight reduction is a priority, such as high-performance sports cars.
Wave-Type Disc Brakes
Wave-type disc brakes stand out due to their distinctive wavy or contoured rotor shape. This design not only improves cooling efficiency but also reduces overall weight. Wave-type rotors are commonly used in off-road and sports applications where durability, heat management, and reduced unsprung weight are essential for optimal performance.
Material of Disc Brake
Grey cast iron
Grey cast iron (flakes graphite cast iron) has excellent processibility and anti-abrasion capability. Grey cast iron has the advantage of being easily mass-produced, making it the most commonly used by discs manufacturers. The drawback is that it could be deformed or cracked under repeated sharp changes in temperature in the high temperature range (about 800℃).
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CV cast iron
The quality control of CV cast iron during the manufacturing process is extremely difficult, so the quality varies. Sometimes its closer to grey cast iron but other times is closer to ductile cast iron.
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Ductile cast iron
Ductile cast iron is an excellent material. The tensile strength of ductile cast iron is equal to that of steel. Ductile cast iron also has an high anti-heat capacity (stability against expansion and contraction). Unfortunately, it has low surface hardness, which can cause abnormal wear and/or abnormal heating due to its high exothermicity, if the material is used for brake discs.
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Carbon
The benefit of Carbon is that it has a high thermal resistance and is lightweight. The downside is that Carbon is expensive, so it is used mainly by high budget racing teams.
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Application of Disc Brake
Automotive
Disc brakes provide efficient braking performance, heat dissipation, and are easy to maintain. Currently mainly used in cars, motorcycles and other motor vehicles
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Bikes
Many performance bikes will also come with disc brakes. It provides greater stopping power and regulation, making it safer especially in wet conditions.
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Aircraft
Disc brakes are used in aircraft landing gear systems to provide reliable and effective braking during landing and taxiing.
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Industrial Machinery
Disc brakes are used in heavy machinery and industrial equipment such as cranes and winches to achieve controlled stopping and holding of loads.
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Racing
Disc brakes are widely used in racing cars and motorcycles, and their excellent braking performance and heat dissipation capabilities are crucial for high-speed racing.
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