What You Need to Know Before You Start
Replacing bicycle brake pads is a straightforward job that takes about 30 minutes once you have the right tools and pads. Most riders can do this without special training—you are removing two small blocks, inserting new ones, and adjusting the position slightly. The hardest part is usually getting the old pads out, not putting new ones in.
Before you begin, identify which type of brakes you have. Rim brakes (the most common on older bikes and many road bikes) grip the wheel rim directly. Disc brakes (standard on mountain bikes and many newer bikes) use a rotor attached to the wheel hub. The steps differ between the two, so knowing which you have prevents wasted time.
You will also need to know whether your brake pads are cartridge pads (a replaceable block inside a metal holder) or integrated pads (the block and holder are one piece). Cartridge pads are cheaper to replace; integrated pads require replacing the entire assembly. Look at your current pads to see which type you have.
Key Takeaways
- Rim brake pads are held in by a single bolt; loosen it, slide the old pad out, and slide the new one in, then tighten and adjust the angle so the pad hits the rim squarely.
- Disc brake pads are held in by a clip or pin that you remove by hand or with a small tool, then the pads slide straight out and new ones slide straight in.
- New pads need a few minutes of gentle braking to bed in before you ride hard; this wears away the shiny coating and creates grip.
- If your brakes feel spongy or weak after replacement, the pads may be installed backward or the rotor may be bent—both are straightforward to fix.
- Brake pads wear faster on wet, hilly terrain and slower on dry, flat terrain; check them every few months if you ride often.
Tools and Materials You Will Need
Gather these items before you start so you do not have to hunt for them mid-job. Most are things you probably already have.
For both rim and disc brakes, you need a hex wrench (usually 4 mm or 5 mm, depending on your brake model) or a Phillips screwdriver. Check your current brake pad bolt to see which fits. You also need new brake pads that match your brake model—bring your bike to a shop or look up your brake brand and model online to find the right part number. Do not guess; pads for Shimano brakes do not fit SRAM brakes, and rim pads do not fit disc brakes.
Have a small brush or old toothbrush on hand to clean dust and grit from the brake area before you install new pads. A clean rag is useful too. If you have disc brakes, keep your hands off the rotor (the metal disc) once you remove the wheel—oils from your skin can reduce braking power. If you accidentally touch it, wipe it with rubbing alcohol on a clean cloth.
Replacing Rim Brake Pads Step by Step
Start by positioning your bike so the wheel you are working on is straightforward to reach. A bike stand is ideal, but you can also flip the bike upside down so it rests on the handlebars and seat. Spin the wheel to make sure it turns freely and does not rub on the brake pads.
Locate the bolt that holds the brake pad in place. On most rim brakes, there is one bolt per pad, positioned on the outside of the brake arm. Use your hex wrench to loosen this bolt—turn it counterclockwise—but do not remove it completely. You only need to loosen it enough that the pad slides out. This usually takes two or three turns.
Once the bolt is loose, slide the old pad straight out toward the wheel rim. It should come free easily. If it is stuck, wiggle it gently side to side while pulling. Brush away any dirt or rubber dust from the brake arm and the area where the pad sits.
Slide the new pad in along the same path the old one came out. Push it all the way in until it stops. The pad should sit flat against the brake arm with no gaps. Now tighten the bolt again, turning clockwise. Tighten it firmly but do not crank on it with all your strength—you can strip the threads.
Spin the wheel and watch where the brake pad sits relative to the rim. The pad should be parallel to the rim and hit it squarely when you squeeze the brake lever. If the pad is angled or sitting too high or low, loosen the bolt slightly and adjust the pad position, then tighten again. Repeat this for the other wheel, then test the brakes gently before riding.
Replacing Disc Brake Pads Step by Step
Remove the wheel from the bike. Most modern bikes use quick-release levers or thru-axles; consult your bike manual if you are unsure how to remove yours. Once the wheel is off, set it aside where the rotor will not get bent—lean it against a wall or lay it flat on a clean surface.
Look at the brake caliper (the part that squeezes the rotor). You will see the brake pads on either side of the rotor. Most disc brakes hold the pads in with a small clip or pin that you can remove by hand or with a small hex wrench. Some brakes have a clip that slides out sideways; others have a pin that pulls straight out. Check your brake manual or look at the caliper closely to see which type you have.
Remove the clip or pin. The brake pads should now slide straight out. If they are stuck, wiggle them gently. Once both pads are out, brush away any dust from inside the caliper. Do not touch the rotor with your bare hands.
Slide the new pads in along the same path the old ones came out. They should sit flat and flush with the caliper. Reinstall the clip or pin to hold them in place. Make sure it is seated fully so the pads cannot rattle or fall out while you ride.
Reinstall the wheel on the bike. Spin it to make sure the rotor does not rub on the pads. If it does, the rotor may be bent or the pads may not be seated correctly. Remove the wheel again and check that the pads are pushed all the way in and the clip is fully seated. If the rotor is bent, that is a separate job—you will need a rotor truing tool or a trip to a shop.
Bedding In New Brake Pads
New brake pads have a shiny coating that reduces grip until it wears away. This process is called bedding in, and it takes about 5 to 10 minutes of gentle braking. Do not skip this step or your brakes will feel weak for the first few rides.
Find a safe, empty area like a parking lot or quiet street. Ride at a moderate speed and brake gently 10 to 15 times, letting the bike slow down gradually rather than stopping hard. Do not brake so hard that the wheels lock up. After this gentle braking, your pads should feel much more responsive.
If you have disc brakes, you may notice a slight squeaking sound during bedding in. This is normal and usually goes away after a few rides. If the squeaking persists after a week of riding, the pads may be installed backward or the rotor may have oil on it. Remove the wheel and check the pad orientation, or clean the rotor with rubbing alcohol.
Common Mistakes and How to Avoid Them
The most frequent error is installing disc brake pads backward. Most pads have a wear indicator (a small metal tab) on one side. This tab should face outward, away from the rotor. If you install the pad with the tab facing the rotor, the brakes will feel weak and the pad will wear unevenly. If you suspect this happened, remove the wheel and check the pad orientation.
Another common mistake is forgetting to tighten the rim brake pad bolt fully. A loose bolt will cause the pad to shift during braking, making the brakes feel grabby or uneven. After you adjust the pad angle, always double-check that the bolt is tight by trying to turn it with your wrench—it should not budge.
Do not install new pads and when ready ride hard. Bedding in is essential; skipping it means weak brakes for your first few rides. Set aside 10 minutes in a safe area before you ride normally.
If your brakes still feel weak or spongy after bedding in, check that the pads are making full contact with the rim or rotor. For rim brakes, spin the wheel and watch the pad position. For disc brakes, spin the wheel and listen for rubbing. If the pad or rotor is misaligned, loosen the brake caliper bolts slightly, center the caliper, and tighten again.
When to Replace Brake Pads
Brake pads wear down over time and need replacement before they wear completely through. Check your pads every month if you ride frequently, or every few months if you ride casually. Look at the pad thickness—if it is thinner than 1 mm, it is time to replace it. Most pads have a wear line or groove molded into them; when the pad wears down to that line, replacement is overdue.
Pads wear faster in wet conditions, on hilly terrain, and if you brake hard frequently. Dry, flat terrain with gentle braking extends pad life significantly. If you notice your brakes feeling less responsive or requiring more lever pressure than usual, worn pads are often the cause.
Replacing pads before they wear completely prevents damage to the rim or rotor. If a pad wears all the way through, the metal backing will contact the rim or rotor, causing scoring that is expensive to repair. Staying ahead of pad wear is much cheaper than fixing a damaged rim or rotor.
Frequently Asked Questions
Do I need to replace both brake pads at the same time?
Yes. Even if only one pad looks worn, replace both pads on the same brake. Pads wear at slightly different rates, and mixing old and new pads causes uneven braking and can damage the rim or rotor. It takes only a few extra minutes to do both, and it prevents problems later.
What if my brakes feel spongy after I replace the pads?
Spongy brakes on rim brakes usually mean the pads are not making full contact with the rim. Spin the wheel and watch the pad position; adjust it if needed. On disc brakes, spongy brakes often mean air is trapped in the brake line (hydraulic brakes only). Bleed the brakes following your brake manual, or take the bike to a shop if you are unsure how.
Can I use any brake pads on my bike?
No. Brake pads are specific to your brake model and type. Rim pads do not fit disc brakes, and pads from one brand often do not fit another brand's brakes. Check your brake model and buy the correct pads. If you are unsure, bring your bike to a shop and ask them to identify the brake type for you.
How long do new brake pads last?
This varies widely depending on riding style, terrain, and weather. In dry conditions with gentle braking, pads can last 6 to 12 months or longer. In wet, hilly terrain with frequent hard braking, they may last only 2 to 4 months. Check your pads regularly rather than relying on a timeline.
Do I need to adjust my brakes after replacing the pads?
For rim brakes, you may need to adjust the pad angle slightly so it hits the rim squarely. For disc brakes, you usually do not need to adjust anything if the pads are installed correctly. If the brakes rub or feel weak after replacement, check the pad position and rotor alignment as described in the common mistakes section.