Brake Pads

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Brake Pads Explained

Brake pads are obviously an essential item on every vehicle and different types of vehicle will have varying requirements as to when these should be replaced depending on usage and other factors.

They are an integral part of disc brakes and comprise of steel backed plates with special friction material adhered to the surface facing the disc brake rotor. The pads work through friction and transform the kinetic energy of the car into thermal energy. The brake caliper contains two pads and when the brakes are applied the caliper then squeezes the pads onto the spinning rotor which slows down or stops the vehicle. The heat energy generated by the brake pad transfers minute amounts of the special friction material to the disc, and allows the pad and disc to have a surface that stick together sufficiently to allow the vehicle to be slowed or stopped.Obviously given time and wear and tear the friction material and the component parts start to wear down, and this is usually evidenced by screeching noises or other unusual sounds coming from the wheels, although there are other methods for alerting the driver depending on the type of car, such as dashboard lights that come on when an electric circuit is closed. However, some vehicles will undergo more heavy duty driving than others so it is vital that the pads are regularly assessed to check they are still functional and fit for purpose.

Different types of Brake Pads

Most disc brakes have two pads per caliper, however racing cars have calipers that can accommodate up to six pads at a time and these have been technically modified to have different frictional qualities that are variable for optimum performance brakes. There are a wide variety of disc brakes from those used for less intense driving to more aggressive and durable brakes for racing and other performance sports. Although car manufacturers will recommend specific types of pads for their vehicles, these can also be customised to get better performance by those who understand the properties of pads and the relative driving environment. For instance, compounds can be altered by buying a different but compatible pad or upgrading to a performance pad depending on personal preference, driving styles and car usage. However, it is crucial that good advice is sought if buying non-standard pads as operating temperature ranges can vary which could lead standard pads to fade under pressure, or performance brake pads being ineffective in the cold for example. With the right advice and parts, brake fade can be reduced by ensuring the right kind of pads are installed that have greater durability and quality than standard pads.

How Brake Pads can improve your car

Whatever the type of vehicle or the reason for driving, there are some basic considerations to ensure you select the best brake pad material. The key functions of the material must be it’s ability to prevent brake fade; efficient recovery time from differing conditions such as increased heat or moisture; the effects of water on braking; the life of the pads in conjunction with wear to the rotor; the ability of the pad material to enable smooth contact with the rotor or drum.All these features will make a difference in terms of what kind of pads you choose and there are four primary types of pads available: semi-metallic, ceramic, low metallic and organic that come in at a range of prices. However, price is not the only or main consideration as mentioned above, and the varying types of brake pad all come with pros and cons. Semi-metallic pads have been a less expensive and standard choice for a number of years for vehicles such as trucks and cars. Ceramic pads are popular as they are fairly durable and will enable hard stopping without too much wear and tear but are a bit more expensive than some other types. Low metallic pads contain less metal and so generate less dust and are often to be found in buses, trucks and other commercial vehicles, and are also lower in price. Finally, organic pads are made from materials such as carbon, glass and resin and are durable with less dust and are more suitable for urban driving conditions as a rule.So, when choosing pads, take some time to look at your driving needs and compare the different kinds of products on offer. You will find a diverse range and a lot of choice to enable you to optimise performance whatever the driving conditions.

Frequently Asked Questions about Brake Pads

How often should I change my brake pads?

The frequency of changing brake pads vary based on use and the type of brake pads used. However, a general guideline is:

  • Every 30,000 to 70,000 miles for standard brake pads.
  • Every 20,000 to 50,000 miles for high-performance brake pads.
It's important to check your brake pads for wear and listen for any unusual noises like brake squeal or grinding. Modern cars have brake pad sensors which help.

Are performance brakes worth the cost?

Performance Brakes: Worth the Cost? Whether performance brakes are worth the cost depends on your driving needs and habits. Here are some key points to consider:

  • Enhanced Safety: Performance brakes provide better stopping power, which is crucial for high-speed driving and emergency situations.
  • Improved Heat Dissipation: They are designed to dissipate heat more effectively, reducing brake fade during prolonged use, such as on track days or aggressive driving.
  • Increased Durability: Often made from higher quality materials, performance brakes tend to last longer than standard brakes, providing better long-term value.
  • Better Pedal Feel: Offers a more responsive and consistent pedal feel, improving overall driving experience and control.
  • Resale Value: Vehicles equipped with performance brakes may have a higher resale value due to the premium equipment.
Considerations:
  • The initial cost of performance brakes is typically higher than standard brakes.
  • They may be noisier due to the use of more aggressive pad materials.
  • Installation might require professional expertise, adding to the overall cost.
  • Ensure compatibility with your vehicle and driving conditions.

What does a bigger brake master cylinder do?

A bigger brake master cylinder increases the volume of brake fluid that can be pushed through the braking system. This can lead to several benefits:

  • Improved Brake Response: A larger cylinder can provide a quicker response when the brake pedal is pressed.
  • Increased Brake Force: It can generate more hydraulic pressure, enhancing the overall braking force applied to the wheels.
  • Better Performance with Larger Brakes: If larger brake calipers or rotors are installed, a bigger master cylinder can help maintain optimal performance.
  • Reduced Pedal Travel: It can decrease the distance the brake pedal needs to be pressed to achieve effective braking.

What does a brake master cylinder do?

The brake master cylinder is a crucial component of a vehicle's braking system. Its primary functions include:

  • Fluid Pressure Generation: It converts the force applied to the brake pedal into hydraulic pressure.
  • Brake Fluid Distribution: It distributes brake fluid to the brake calipers or wheel cylinders at each wheel.
  • System Monitoring: It often includes a reservoir to maintain the brake fluid level and may have a warning system for low fluid levels.
  • Dual Circuit Design: Many master cylinders have a dual circuit design for safety, ensuring that if one circuit fails, the other can still function.

What is the best material for brake lines?

The best materials for brake lines are:

  • Stainless Steel: Highly resistant to corrosion and offers excellent durability. Ideal for high-performance vehicles.
  • Copper-Nickel Alloy: Combines the benefits of copper and nickel, providing good corrosion resistance and flexibility.
  • Rubber: Commonly used for flexible brake lines, it offers good flexibility but may degrade over time due to heat and exposure to brake fluid.
  • PTFE (Polytetrafluoroethylene): Known for its chemical resistance and low friction, often used in high-performance applications.

How often should I change brake fluid?

It is generally recommended to change brake fluid every 2 years or 24,000 miles, whichever comes first. However, this can vary based on the vehicle manufacturer’s guidelines and driving conditions.

  • Check the owner's manual for specific recommendations.
  • Inspect brake fluid regularly for contamination or moisture.
  • Consider changing brake fluid more frequently if driving in harsh conditions.

What is a brake duct?

A brake duct is a component used in vehicles to enhance the cooling of the brake system. It directs airflow towards the brake components, helping to dissipate heat generated during braking. Key functions of brake ducts include:

  • Improving brake performance by maintaining optimal temperatures.
  • Reducing the risk of brake fade, which can occur when brakes overheat.
  • Extending the lifespan of brake components by preventing excessive heat buildup.
Brake ducts are commonly found in high-performance and racing vehicles, but they can also be beneficial in regular road cars, especially in demanding driving conditions.

Does anti-roll bar affect steering?

Yes, an anti-roll bar can affect steering. It plays a crucial role in maintaining vehicle stability during cornering, which indirectly influences steering response. Effects of an anti-roll bar on steering include:

  • Improved Handling: By reducing body roll, the anti-roll bar helps keep the tyres in better contact with the road, enhancing grip and steering precision.
  • Steering Feedback: A stiffer anti-roll bar can provide more direct feedback to the driver, making the steering feel more responsive.
  • Understeer/Oversteer Balance: The design and stiffness of the anti-roll bar can influence the balance of the vehicle, potentially leading to understeer or oversteer, which affects steering behaviour.

Is an anti-roll bar necessary?

An anti-roll bar, also known as a sway bar, is not strictly necessary for a vehicle to operate, but it plays a significant role in enhancing handling and stability. Benefits of an anti-roll bar include:

  • Improved Handling: It reduces body roll during cornering, allowing for better control.
  • Increased Stability: It helps maintain a level stance, improving traction and grip.
  • Enhanced Safety: By minimising roll, it can prevent loss of control in sharp turns.
While some vehicles may perform adequately without one, especially in everyday driving conditions, an anti-roll bar is particularly beneficial for performance-oriented cars or those frequently driven in challenging conditions.

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