Shimano 105 Brake Pads: The Ultimate Guide to Selection, Installation, and Maintenance​

Shimano 105 brake pads are essential, high-performance components designed for the Shimano 105 series of bicycle braking systems, offering reliable stopping power, durability, and safety for road and gravel cyclists. This guide provides a comprehensive, practical overview covering everything from choosing the correct pads to step-by-step installation and long-term care, ensuring optimal brake performance and rider security. Based on extensive mechanical experience and technical expertise, the information here is tailored to help cyclists of all levels make informed decisions and perform maintenance with confidence, aligning with the highest standards of accuracy and trustworthiness.

​Understanding Shimano 105 Brake Pads and Their Role in Your Bike's Braking System​

Shimano 105 is a popular groupset series known for offering professional-grade performance at a mid-range price point, and its braking system is a critical part of this package. Brake pads are the replaceable friction surfaces that press against the brake rotors (in disc brakes) or the rim (in rim brakes) to slow or stop the bicycle. For Shimano 105, these pads are engineered to meet specific standards for heat dissipation, wear resistance, and modulation. The braking system's efficiency depends heavily on the pad's condition and material. Worn or incorrect pads can lead to reduced stopping power, noise, and safety hazards. Thus, understanding your brake pads is fundamental to bike maintenance. Shimano 105 systems primarily use disc brakes in modern iterations, with pad designs varying between resin (organic) and sintered (metal) compounds, each suited to different riding conditions. The calipers, such as the BR-R7070 or BR-R7170, are designed to work with specific pad shapes, and using incompatible pads can cause malfunction. Always verify your exact brake model before purchasing pads, as even within the 105 line, there are nuances between hydraulic disc brake versions.

​Types of Shimano 105 Brake Pads: Resin vs. Sintered​

Shimano produces two main types of brake pads for its 105 disc brake systems, each with distinct characteristics. Choosing the right type affects performance, noise, and longevity.

1. ​Resin Brake Pads (Organic Pads):​​ These pads are made from organic materials like rubber, Kevlar, and carbon, bound with resin. They are the standard choice for most riders. ​Key features include:​​

   • ​Quieter Operation:​​ They tend to generate less noise, especially when new or in dry conditions.
   • ​Better Initial Bite:​​ They often provide strong stopping power with less lever pressure from the start.
   • ​Rotor-Friendly:​​ They are generally easier on brake rotors, causing less wear.
   • ​Performance in Dry Conditions:​​ They excel in dry, mild to moderate riding. However, they wear faster than sintered pads, particularly in wet, muddy, or demanding conditions like long descents where heat buildup can degrade the resin compound.

2. ​Sintered Brake Pads (Metal Pads):​​ These pads are made from metallic particles (like copper, steel, or iron) sintered together under high heat and pressure. They are the choice for aggressive or all-weather riding. ​Key features include:​​

   • ​Higher Durability:​​ They last significantly longer than resin pads, especially in harsh conditions.
   • ​Superior Wet Weather Performance:​​ They maintain more consistent stopping power in rain and mud.
   • ​Better Heat Dissipation:​​ They handle high temperatures from prolonged braking better, resisting fade on long downhill stretches.
   • ​Considerations:​​ They can be noisier, may require a slight "bed-in" period for optimal performance, and can wear down rotors slightly faster. They also sometimes require a bit more lever force.

For Shimano 105, the pad shape is typically the "B01S" or "B02S" design for flat-mount disc brakes. Always check the pad compound code on the packaging or old pad: "L" usually denotes resin, while "J" or "A" often denotes sintered metal. Your riding style dictates the choice: choose ​resin for general road use, commuting, and dry climates, and opt for ​sintered for gravel riding, wet climates, touring with heavy loads, or mountainous terrain.

​How to Identify and Choose the Correct Shimano 105 Brake Pads​

Selecting the wrong brake pad can be ineffective and dangerous. Follow this process to ensure compatibility.

​Step 1: Identify Your Brake Caliper Model.​​ Look at the brake caliper itself. For recent Shimano 105 groupsets (R7000 series and later), the caliper is usually a flat-mount hydraulic disc brake. The model number is often stamped on the caliper body, e.g., BR-R7070 (rim brake versions are largely discontinued in current 105). If unsure, consult your bike's manual or the manufacturer's website. The Shimano 105 series uses a specific pad cartridge system.

​Step 2: Check the Pad Shape.​​ Remove the wheel and look at the existing pads. Shimano 105 disc brake pads are rectangular inserts that slide into a metal cartridge or holder. The standard shape for current hydraulic models is the "B01S" style. You can also find the shape number on the edge of the old pad or its backing plate. Purchasing pads with the incorrect physical shape means they will not fit into the caliper.

​Step 3: Decide on the Compound.​​ As detailed above, choose between resin and sintered based on your riding conditions. Many retailers and packaging clearly state "Resin" or "Sintered Metal." Shimano sells them as separate products. It is also possible to use aftermarket pads from reputable brands like SwissStop or Jagwire, provided they specify compatibility with Shimano flat-mount hydraulic brakes/B01S pad shape.

​Step 4: Purchase from Reputable Sources.​​ Buy from authorized bike shops or well-known online retailers to avoid counterfeit products. Genuine Shimano pads have consistent quality and safety testing. Look for official packaging with Shimano branding and part numbers like "Y8BZ98000" for a specific resin pad set.

​A Detailed, Step-by-Step Guide to Replacing Shimano 105 Brake Pads​

Replacing brake pads is a fundamental maintenance task. With the right tools and care, it can be done at home. ​Always wear safety glasses when working with brakes, as springs and parts can release suddenly.​​

​Tools and Materials Required:​​ New Shimano 105 brake pads (correct type), clean rag, isopropyl alcohol, disc brake cleaner (optional), tire levers (to remove wheel), Allen key set (usually 4mm or 5mm for the pad retention pin/bolt), a flat piece of plastic or a dedicated brake pad spacer (to prevent piston lock), and latex or nitrile gloves to keep oils off rotors and pads.

​Procedure:​​

1. ​Prepare the Bike and Workspace.​​ Secure the bike in a repair stand or position it so the wheel can be removed safely. Work in a clean, well-lit area. If dealing with the rear brake, shift the chain onto the smallest rear cog to provide slack.

2. ​Remove the Wheel.​​ Open the quick-release or thru-axle and carefully take the wheel out of the frame or fork. This provides clear access to the brake caliper and pads. ​Place the wheel safely aside, avoiding any contact with the brake rotors to prevent contamination.​​

3. ​Inspect the Caliper and Old Pads.​​ Look at the caliper. You will see a metal pin or bolt holding the pad cartridge in place. Note how much material is left on the old pads. If the pad material is less than 1mm thick at any point, replacement is urgent. Also, check the brake rotor for deep grooves, cracks, or oil contamination.

4. ​Remove the Pad Retention Pin/Bolt.​​ Using the correct size Allen key (often 4mm), carefully unscrew the pad retention bolt or pin. On some 105 calipers, this is a small bolt; on others, it is a smooth pin secured by a small set screw. ​Set this pin and any washers aside in a safe place, as it is essential for reassembly.​​ Once the pin is removed, the entire pad cartridge (the metal frame holding the two pad inserts) can be slid or pulled out of the caliper. It may be held in by a small spring clip; note its orientation.

5. ​Extract the Old Pad Inserts from the Cartridge.​​ The new pad set you bought likely includes two new friction pads and sometimes new metal spring clips. Remove the old, worn pad inserts from the metal cartridge. You may need to push them from the back. This is a good time to clean the metal cartridge with isopropyl alcohol and a rag.

6. ​Install the New Pads into the Cartridge.​​ Insert the new pad inserts into the clean metal cartridge. Ensure they are seated fully and evenly. There is usually a small metal or spring clip that provides a bit of tension and anti-rattle; make sure it is correctly positioned (often on the trailing edge of the pads). Refer to the new pad's packaging for the correct orientation.

7. ​Push Back the Brake Pistons.​​ Before inserting the new, thicker pads, the brake pistons (the moving parts inside the caliper) must be retracted. ​This is a critical step.​​ Insert a plastic tire lever, a dedicated piston press tool, or the flat plastic spacer that came with the new pads between the pistons. Gently and evenly press the pistons back into the caliper bore until they are nearly flush. Use even pressure to avoid cocking a piston. If pistons are stuck, do not force them; consult a mechanic. ​Never use a screwdriver directly on the pistons, as it can damage them.​​ Have a rag ready, as this may cause a slight overflow of brake fluid in the reservoir; wipe any drips immediately.

8. ​Reinsert the Pad Cartridge.​​ Slide the loaded pad cartridge back into the caliper, ensuring it is fully seated and the alignment is straight. The pad material should face the rotor space evenly.

9. ​Reinstall the Retention Pin/Bolt.​​ Insert the retention pin or bolt through the caliper and pad cartridge. Tighten it to the manufacturer's specification. For Shimano 105, this is typically a low torque, around 6-8 Nm. ​Do not overtighten, as this can strip the threads or bind the pads.​​ Use a torque wrench if possible. Ensure the pin is secure and the pads cannot move laterally.

10. ​Reinstall the Wheel and Bed-In the New Pads.​​ Put the wheel back on the bike, securing the axle properly. ​Before riding, pump the brake lever several times until it feels firm.​​ The pistons will move out to take up the gap. The first few lever pulls may feel soft; this is normal. Now, you must "bed-in" the new pads. Ride the bike at a slow speed in a safe area. Apply the brakes moderately to bring the bike to a slow walk, then release. Repeat this 10-20 times, gradually increasing speed and brake pressure slightly. This process transfers a thin, even layer of pad material onto the rotor, which is essential for optimal, quiet braking performance. Avoid sudden, hard stops during this process.

​Routine Maintenance and Care for Shimano 105 Brake Pads​

Regular maintenance extends pad life and ensures safety.

• ​Visual Inspection:​​ Check pad wear every few weeks or after any long, demanding ride. Look through the caliper or remove the wheel to see pad thickness. Replace pads when the friction material is 1mm thick or less. Many pads have wear indicator grooves; if these grooves disappear, replace the pads immediately.
• ​Cleaning:​​ Keep pads and rotors clean. Contamination from oil, grease, or debris causes noise and reduces power. To clean, use a dedicated disc brake cleaner or isopropyl alcohol on a clean rag. Spray or wipe the rotor surface and the pad surfaces (if accessible). Avoid touching the pad or rotor surface with bare fingers.
• ​Noise Troubleshooting:​​ Squealing or squeaking is common. First, ensure pads and rotors are clean via the method above. Lightly sanding the pad surface with fine sandpaper (e.g., 120-grit) can remove glazed material. Ensure all mounting bolts (caliper and pad retention) are properly torqued, as loose parts can vibrate.
• ​Alignment (Caliper Adjustment):​​ If brakes are rubbing (a constant scraping sound), the caliper may be misaligned. With the wheel securely fastened, loosen the two caliper mounting bolts just enough so the caliper can move. Squeeze the corresponding brake lever firmly and hold it. While holding the lever, re-tighten the mounting bolts to the specified value (usually 6-8 Nm). This centers the caliper over the rotor. Release the lever and spin the wheel to check for rubbing. Minor adjustments can be made by sight.
• ​Bleeding Hydraulic Brakes:​​ Shimano 105 uses hydraulic fluid. Over time, air can enter the system, causing a spongy lever feel. While pad replacement does not require bleeding, if the lever feels excessively soft after pad changes or over time, the system may need a bleed. This is a more advanced procedure requiring a bleed kit and specific mineral oil. If unsure, have a professional mechanic perform this service.

​Safety Warnings and Common Mistakes to Avoid​

• ​Never Mix Pad Compounds.​​ Do not install a resin pad on one side and a sintered pad on the other. This creates unbalanced braking and unpredictable performance.
• ​Avoid Contamination.​​ The single biggest cause of brake failure is oil or grease on pads or rotors. Handle pads by their edges, and keep all lubricants away from the braking system.
• ​Do Not Use Compressed Air to Clean Calipers.​​ This can force debris into the piston seals or push pistons out unevenly.
• ​Respect Torque Specifications.​​ Overtightening caliper or pad bolts can damage frames, forks, or components. Undertightening can lead to parts coming loose while riding.
• ​Check Overall System Health.​​ Worn pads are one issue. Also inspect rotors for minimum thickness (marked on the rotor), hose for cracks, and levers for proper function. If the rotor is heavily worn, gouged, or below the minimum thickness, it must be replaced with the pads.
• ​Post-Installation Test.​​ After any brake work, test the brakes at low speed in a controlled environment before normal riding. Ensure both front and rear brakes engage smoothly and firmly.

​When to Seek Professional Help​

While pad replacement is a manageable task, seek a qualified bicycle mechanic if you encounter: seized or stuck pistons that won't retract; a persistently soft or sinking brake lever even after bedding in; fluid leaks from the caliper or lever; deep scoring on rotors that requires machining or replacement; or if you lack the proper tools or confidence. Professional servicing ensures the entire hydraulic system is safe.

​Enhancing Performance and Longevity: Advanced Tips​

• ​Rotor Compatibility:​​ For best performance, use Shimano RT-series rotors or other high-quality, compatible rotors. The rotor's design affects cooling and bite. Ensure the rotor size (e.g., 140mm, 160mm) matches your bike's specification.
• ​Carry Spares:​​ On long tours or multi-day rides, carry a spare set of pads and the necessary Allen key. Pad wear can accelerate in mountainous terrain.
• ​Seasonal Swaps:​​ Riders in varied climates might consider swapping pad compounds seasonally—using sintered for wet winters and resin for dry summers.
• ​Break-In Period:​​ Allow for a proper bedding-in process every time pads or rotors are replaced. Rushed bedding leads to uneven material transfer, reducing power and causing noise.

​Conclusion: Prioritizing Safety with Quality Components​

Shimano 105 brake pads are precisely engineered components that are vital for safe cycling. Understanding the differences between resin and sintered types, following a meticulous replacement procedure, and adhering to a simple maintenance routine will ensure your brakes perform reliably. Always prioritize using genuine or high-compatibility parts, correct tools, and torque settings. Regular inspection and proactive replacement, well before pads are completely worn, prevent damage to more expensive parts like rotors and ensure you always have dependable stopping power. By investing time in learning this aspect of bike maintenance, you enhance your riding safety, save money on shop fees, and deepen your mechanical knowledge, all of which contribute to a more enjoyable and secure cycling experience.