13/01/2005
Understanding Your Shimano 105 R7020 Brakes
The Shimano 105 R7020 groupset, specifically the BR-R7070 hydraulic disc brake calipers, represents a fantastic balance of performance, reliability, and value for road cyclists. Whether you're a seasoned racer, a dedicated commuter, or a weekend adventurer, ensuring your braking system is in optimal condition is paramount for safety and enjoyment. One of the most common maintenance tasks for any disc brake system is replacing the brake pads. But with so many options available, it's easy to get confused about which pads are compatible with your specific setup. This guide is here to demystify the process of finding the right brake pads for your Shimano 105 BR-R7070 calipers.
Shimano's Brake Pad Naming Conventions
Shimano, like many manufacturers, uses a specific naming convention for its brake pads. Understanding this will help you identify compatible options. For the BR-R7070 calipers, you'll primarily be looking for pads that use Shimano's standard 'J' type fitting. These are the most common and widely available. Shimano also categorises its pads by material compound, which significantly impacts their performance characteristics.
Resin vs. Metal (Sintered) Pads
The two main types of brake pads you'll encounter for your R7070 calipers are:
- Resin Pads: These are often referred to as 'organic' pads. They are made from a composite material that includes friction particles, binders, and fillers. Resin pads offer excellent initial bite and modulation, meaning they feel smooth and controllable. They tend to be quieter than metal pads and perform well in dry conditions. However, they may wear out faster, especially in wet or muddy conditions, and can be susceptible to 'brake fade' under prolonged heavy braking at high temperatures.
- Metal (Sintered) Pads: These pads are made from metallic particles, such as copper or steel, that are bonded together under heat and pressure. Metal pads are known for their durability and superior performance in wet and muddy conditions. They also offer more consistent braking power at higher temperatures, making them a good choice for long descents or demanding terrain. The trade-off is that they can be noisier, may require a slightly longer bedding-in period, and can sometimes be harder on your rotors.
Shimano's Specific Pad Codes for R7070
For the Shimano 105 BR-R7070 calipers, the most direct and recommended replacement pads are those designated by Shimano as 'J' type. Within this designation, you'll find different compound options. The most common and widely compatible Shimano pad types for your R7070 calipers are:
- Shimano L03A Resin Pads: These are the standard resin pads that often come fitted to the BR-R7070 calipers. They are renowned for their excellent modulation, quiet operation, and good performance in dry to mixed conditions. They are a superb all-round option for most riders.
- Shimano L05A Resin Pads: This is a newer generation of resin pad that offers improved wear resistance and better heat dissipation compared to the L03A. They maintain the smooth modulation and quiet operation that cyclists expect from Shimano resin pads, making them an excellent upgrade or direct replacement.
- Shimano K03S Resin Pads: Similar to the L03A, these are also resin pads. While the 'L' series is generally considered the newer standard for many road calipers, the 'K' series also exists and is compatible. The L03A and K03S are often very similar in performance.
- Shimano L04C Metal (Sintered) Pads: If you're looking for increased durability and better performance in wet or muddy conditions, the L04C metal pads are the go-to option. They provide strong, consistent braking power and are more resistant to wear. However, be aware they might be slightly noisier and potentially harder on your rotors over the long term.
Crucially, all these 'L' and 'K' series pads with the '03A' or '04C' suffix are designed for the same caliper body and share the same 'J' type fitting.
Identifying Your Current Pads
If you're unsure about what pads you currently have, the easiest way to identify them is to remove the wheel and the caliper retaining pin. The old pads will slide out, and you can often see a model number or code printed on the backing plate. Alternatively, you can compare the shape of your current pads to images of the L03A, L05A, or L04C pads online. The backing plate shape is a key indicator.
Third-Party Brake Pads
Beyond Shimano's own offerings, several reputable third-party manufacturers produce brake pads that are compatible with Shimano hydraulic disc brake systems, including the BR-R7070. Brands like Kool-Stop, SwissStop, and Jagwire all offer excellent alternatives. When choosing a third-party pad, ensure it explicitly states compatibility with Shimano hydraulic disc brakes and matches the 'J' type fitting. These often come in various compounds, mimicking the resin and metal options from Shimano, and can sometimes offer a different feel or performance characteristic.
For example:
- Kool-Stop D-Series: Kool-Stop offers pads specifically designed for Shimano road hydraulic systems. Look for their 'D' series, which are often available in both their Salmon (high performance, resin-like) and Black (more durable, metal-like) compounds.
- SwissStop Catalyst: SwissStop also produces high-quality aftermarket pads for various brake systems. Ensure you select the model designated for Shimano hydraulic road calipers.
Table: Shimano Pad Compound Comparison
| Shimano Pad Model | Type | Key Characteristics | Best For |
|---|---|---|---|
| L03A | Resin | Excellent modulation, quiet, good initial bite. | Dry to mixed conditions, general riding, racing. |
| L05A | Resin | Improved wear resistance and heat dissipation over L03A, quiet. | All-round use, longer descents, mixed conditions. |
| K03S | Resin | Similar performance to L03A, reliable. | General riding, all-weather commuting. |
| L04C | Metal (Sintered) | High durability, superior wet weather performance, consistent power. | Wet conditions, mud, long descents, touring, demanding terrain. |
Installation and Bedding-In
Once you've chosen your new brake pads, proper installation and bedding-in are crucial for optimal performance. Always ensure the caliper retaining pin is correctly reinserted to hold the pads in place. For bedding-in, most manufacturers recommend a process of repeated braking from a moderate speed, allowing the brakes to cool between applications. This helps transfer a thin, even layer of pad material to the rotor surface, ensuring consistent and powerful braking. A typical bedding-in process might involve:
- Find a safe, open area with a gentle slope or flat ground.
- Accelerate to a moderate speed (e.g., 15-20 mph).
- Apply the brakes firmly but without locking the wheels, slowing down significantly (e.g., to walking pace).
- Release the brakes and allow them to cool for a minute or two.
- Repeat this process 10-20 times for each brake.
Proper bedding-in is essential for unlocking the full potential of your new pads.
Frequently Asked Questions (FAQs)
Q1: Can I use pads designed for mechanical disc brakes on my hydraulic R7070 calipers?
No, you should not. Hydraulic and mechanical disc brake systems use different caliper designs and pad shapes. Using incompatible pads can lead to poor braking performance or even damage to your braking system.
Q2: How often should I replace my brake pads?
This depends heavily on your riding style, the conditions you ride in, and the type of pads you use. As a general rule, inspect your pads regularly. If the friction material is worn down to less than 1mm or if you notice a significant decrease in braking power, it's time for a replacement. Resin pads typically wear faster than metal pads.
Q3: Will metal pads wear out my rotors faster?
Metal (sintered) pads are generally harder than resin pads and can contribute to rotor wear over time. However, modern disc brake rotors are designed to withstand this. If you notice excessive rotor wear or grooving, it might be worth considering a rotor upgrade or sticking to resin pads.
Q4: Do I need to bleed my brakes after changing the pads?
No, simply changing the pads does not require a brake bleed, provided you don't accidentally open the hydraulic system. Ensure the pistons retract smoothly when pushing the old pads out and that the new pads fit without excessive force.
Q5: Are there any specific tools needed to change brake pads?
Yes, you will typically need a 5mm Allen key to remove the caliper retaining bolt, and possibly a tyre lever or a flathead screwdriver to gently pry the old pads out and push the pistons back. Always be careful not to damage the pistons or the rotor.
Conclusion
Choosing the right brake pads for your Shimano 105 BR-R7070 hydraulic disc brakes is straightforward once you understand Shimano's naming conventions and the differences between pad compounds. Whether you opt for the smooth modulation of resin pads like the L03A or L05A, or the robust performance of metal pads like the L04C, ensuring you select a compatible 'J' type pad will guarantee your brakes perform at their best. Regular inspection and timely replacement are key to maintaining safe and confident braking on all your rides. Happy cycling!
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