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NAO brake shoes are typically used in light-duty applications, such as in passenger vehicles and motorcycles. They are quieter than other types of brake shoes. There are several types of NAO brake shoes, including:
Cast iron brake shoes
Cast iron brake shoes have been used for a long time in braking systems. They have good wear resistance and strength. As a result, they have a longer lifespan. These brake shoes have good thermal stability. Therefore, they can withstand high temperatures from friction without losing their performance. Cast iron brake shoes have high noise levels and are not suitable for environmentally friendly applications because of their high emissions.
Friction composite brake shoes
Fibre composite brake shoes are made using different fibres, such as aramid, nylon, and polyester. These fibres are combined with resins to create a strong and wear-resistant material. Fibre composite brake shoes are lighter than other types. Therefore, they can improve the overall vehicle performance. They also have good thermal stability and are suitable for high-speed applications. However, the brake shoes have a complex manufacturing process, making them more expensive.
Semi-metallic brake shoes
Semi-metallic brake shoes are made using 30% to 70% metals and natural or synthetic fibres. The metals used include copper, steel, and brass. Semi-metallic brake shoes have higher strength and are wear-resistant. They have good thermal stability and can function well under high temperatures. As a result, they are suitable for heavy-duty and high-speed applications. The brake shoes also have good impact resistance. However, they have a high noise level and can produce a lot of dust, making them unsuitable for applications that require quiet operation.
Organ brake shoes
Organ brake shoes are made using natural and organic materials, such as rubber, cellulose, and resins. They are quieter than other types of NAO brake shoes. As a result, they are mostly used in applications that require quiet operations, such as in electric vehicles. Organ brake shoes have low emissions and are environmentally friendly. However, they have a shorter lifespan and are not suitable for high-speed and heavy-duty applications.
NAO brake shoes come in different sizes and types to fit different vehicles and their braking systems. Some common specifications include the following:
Size:
The brake shoes are available in different sizes, with each size corresponding to a specific vehicle type. The sizes are measured using the length and width dimensions. The length size ranges from 6 inches to 12 inches, while the width measures between 2 inches and 3.5 inches. The sizes of the brake shoes play an important role in the brake system's efficiency.
Material:
The brake shoes are made from different materials to suit different vehicle types and driving conditions. For instance, softer materials like organic compounds are used for light-duty vehicles, while harder materials like metals are suitable for heavy-duty vehicles.
Friction Coefficient:
The brake shoes are designed with different friction coefficients, which affect the braking performance. A higher friction coefficient means a better braking effect and vice versa. The friction coefficient value ranges between 0.35 and 0.55.
Mounting Method:
NAO brake shoes are manufactured with different mounting methods. The most common method is the top-mounted and side-mounted methods. Each mounting method has its advantages and limitations.
Type:
Generally, there are three main types of brake shoes, including drum brake shoes, parking brake shoes, and hydraulic brake shoes. Each type is designed for a specific application.
Maintaining NAO brake shoes is a very important aspect that enhances their durability and ensures they function optimally. Here are some general maintenance tips.
Inspect the Brake Shoes:
It is important to frequently inspect the brake shoes for damage or wear. In case the friction material becomes thin, the brake shoes should be replaced immediately before they start damaging the brake drum.
Clean the Brake Shoes:
The brake shoes should be cleaned regularly to prevent the accumulation of dust, grease, and debris. This can be done using a clean cloth and brake cleaner.
Check the Adjustment:
The brake shoes should be properly adjusted to ensure they fit well with the brake drum. Improper adjustment can lead to brake noise, reduced braking performance, and damage to the brake drum.
Check the Brake Assembly:
The components around the NAO brake shoes, such as the brake drum and brake wheel cylinder, should be checked to ensure they are in good condition. Worn-out components should be replaced as soon as possible.
Avoid Overuse:
Brake shoes with NAO should not be overused, as this can cause them to wear out quickly. For instance, drivers should avoid riding on the brakes and frequently using brakes on steep slopes.
Choosing the right NAO brake shoes for a vehicle requires careful consideration of several factors to ensure optimal braking performance, longevity, and safety. Here are some key factors to consider when selecting NAO brake shoes:
Vehicle Type and Specifications
The brake shoes selected should be compatible with the vehicle's make, model, and year of manufacture. This ensures a proper fit and optimal brake performance. For instance, heavier vehicles like trucks require more robust brake shoes compared to lighter vehicles.
Driving Conditions
Consider the typical driving conditions such as urban, highway, or rural. NAO brake shoes offer smooth and quiet braking, making them ideal for urban driving. However, for drivers who frequently drive on steep inclines or in hilly areas, brake shoes with higher friction might be more suitable.
Performance Requirements
Different brake shoes offer varying levels of braking performance. Determine the performance level required based on the vehicle type and driving habits. NAO brake shoes provide adequate performance for standard vehicles and driving conditions.
Brand and Quality
Selecting a reputable brand and high-quality brake shoes is essential for safety and durability. Consider brands that are well-known for their quality and reliability. NAO brake shoes are manufactured by various companies, so it's important to do research and choose a reliable brand.
Price
NAO brake shoes are available in various price ranges depending on the brand and manufacturer. It's important to set a budget for brake shoes. However, avoid overly cheap products as they may be of inferior quality and not last long.
Installation
Consider whether the brake shoes will be installed professionally or if a DIY approach is preferred. Some brake shoes come with installation instructions, while others may require professional installation. NAO brake shoes are easy to install, so long as the user follows the provided instructions.
Warranty
Check the warranty offered by the manufacturer. A good warranty is an indicator of the manufacturer's confidence in the product quality. Most manufacturers offer a one-year warranty for brake shoes.
Replacing NAO brake shoes is a straightforward process that can be done with some basic mechanical knowledge and the right tools. Here's a step-by-step guide on how to replace NAO brake shoes:
1. Gather Materials and Tools
2. Prepare the Vehicle
With the vehicle on a flat surface, engage the parking brake and loosen the lug nuts. Using the jack, raise the vehicle and place it on jack stands. Remove the wheels to access the brake shoes.
3. Remove Old Brake Shoes
Using the socket wrench, remove the bolts holding the brake shoes. A spring tool or brake shoe tool may be needed to remove the connecting springs and retainers. Take note of the brake shoe configuration and spring placements, as this will help when installing the new shoes.
4. Clean the Area
Use a brake cleaner to remove dust and debris from the brake assembly. This is a good time to inspect other brake components, like the brake drum and wheel cylinder, and replace them if necessary.
5. Install New Brake Shoes
Position the new NAO brake shoes in the assembly, following the noted configuration. Reattach the springs, retainers, and bolts. Ensure everything is tightened to the manufacturer's specifications.
6. Reassemble and Test
Once both sides are done, reattach the wheels and lower the vehicle. Before driving, press the brake pedal several times to seat the shoes and ensure proper function. Take a short drive at low speed to test the brakes.
Q1: How Often Should Brake Shoes Be Replaced?
A1: The frequency of brake shoe replacement can vary based on driving habits, the type of vehicle, and the material of the brake shoes. Generally, it's advisable to inspect them every 20,000 to 50,000 miles. Signs of wear include noise, reduced braking efficiency, or visual wear.
Q2: Can Users Upgrade to Better Brake Shoe Materials?
A2: Yes, users can upgrade to NAO (Non-Asbestos Organic) brake shoes. NAO materials offer smoother braking and reduced noise, making them ideal for urban and suburban driving. However, it's essential to choose a material that suits the vehicle and driving conditions.
Q3: Are Brake Shoes Universal for All Vehicles?
A3: No, brake shoes are not universal. Each vehicle is designed to use specific brake shoes that fit its braking system. When procuring brake shoes, ensure they match the vehicle's make, model, and year to guarantee proper fit and performance.
Q4: Can Brake Shoes Be Installed Without Professional Help?
A4: While it's possible to install brake shoes with basic mechanical skills, it's recommended to seek professional help. Proper installation is crucial for safety. An incorrectly fitted brake shoe can lead to brake failure or uneven shoe wear.
Q5: Do New Brake Shoes Require a Break-In Period?
A5: Yes, there is a break-in or bedding period for new brake shoes. During this time, which lasts about 300 miles, users should avoid hard braking to allow proper shoe and drum mating. This process ensures optimal braking performance and shoe longevity.
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