How to Clean Bicycle Disc Brakes

Squeaky brakes can be really annoying when you’re going for a ride around the neighborhood. The “squeak” from your brakes can happen when your brake pads aren’t attaching smoothly to your disc rotors—these are the large, metal rings that go around the center of your bike wheels.^{[1]XResearch source} Don’t worry! A thorough cleaning can help your brake pads and disc rotors work smoothly, and might get rid of the unpleasant noise. While this process requires a little bit of elbow grease, it shouldn’t take more than an hour or so to clean your bicycle disc brakes.

Part 1

Part 1 of 4:

Brake Disassembly

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1
Take apart your brakes after riding your bike so they'll be easier to clean.^{[2]XExpert SourceJonas Jackel
Owner, Huckleberry BicyclesExpert Interview. 18 February 2020.} Set aside some time right after your bike ride to give your disc brakes a little TLC. This way, all of the dirt, dust, and salt will be easier to wipe off.^{[3]XResearch source}
- If you store your bike outside, you might have to clean your disc brakes more often. Give your bike a quick examination before and after each ride to see if everything looks good.
- You don’t need to clean your brakes after every ride. Instead, just listen for squeaking—this is a good indication that your disc brakes need to be cleaned.^{[4]XResearch source}
Your brake pads and disc rotor are pretty sensitive, and you don’t want to transfer any oil from your fingertips to these parts of your bike. Slip on these gloves before you start disassembling your bike, so you don’t contaminate anything by mistake.^{[5]XResearch source}
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It can be tricky to take off your wheels while your bike is still upright. Instead, find an open area where you can safely flip over your bike so the handlebars and bike seat are flush with the ground.^{[6]XResearch source}
4
Remove the large bolts holding your bike wheels in place. Look for a large bolt going through your bike axle, which holds each wheel in place. Rotate this bolt counterclockwise and slide it out of your bike. At this point, you can safely remove and separate the wheel from the rest of the bike.^{[7]XResearch source}
- Take a peek at your bike’s owner manual for more specific instructions. Some bikes might be built a little bit differently.
5
Use a T25 Torx key to unscrew the bolts from your disc rotor. Set your bicycle wheels on a flat, even surface, with the center of the wheel facing up. Grab a T25 Torx key—this is a special kind screwdriver designed for the bolts that attach your disc rotor to the center of your bike. Remove the bolts 1 at a time, and then pull the disc rotor off the wheel.^{[8]XResearch source}
- Disc rotors are large, metal circles attached to the center of your bike wheels. Each wheel has 1 disc rotor attached to it.
- Most bike wheels have 6 bolts holding the disc rotor in place. Keep them in a safe place for when you’re reassembling the bike.
- Some disc rotors aren’t connected with bolts. You can remove these with a BB tool—simply align the round portion of the tool around the center of the disc rotor, and rotate it counterclockwise until the disc comes loose.^{[9]XResearch source}
Examine the section of your bike that connects to the center of the wheels. You’ll see a large, horizontal bolt going through both brake pads—this is known as a retaining bolt, and it helps hold these pads in place. Grab a pair of needle-nose pliers and pull off the retaining circlet—this is a small cap that goes over 1 end of the bolt. Then, stick an Allen key into the opposite side of the brake pads to unscrew and remove the bolt.^{[10]XResearch source}
The bike caliper is the area where your brake pads are stored. Now that you’ve removed the retaining bolt, grab onto the brake pads with 2 fingers. Pinch and pull these pads out of the bike—with the retaining bolt gone, they should come out easily.^{[11]XResearch source}

Part 2

Part 2 of 4:

Wheel Hub and Disc Rotors

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1
Wipe down the wheel hub face with a rag dipped in brake cleaner. Find the wheel hub face—this is the central part of the wheel where the disc rotor was attached. Dip a clean, lint-free cloth or paper towel with specialized bike brake cleaning liquid, and rub it around the edges of this hub. A lot of crud and dirt can build up there after your bike rides.^{[12]XResearch source}
- The hub is a circular area, directly in the center of your bike wheel.
- You can find brake cleaner online, or in some specialty stores.
Rub the brake cleaner into your disc rotors with a clean, lint-free paper towel, rubbing away any dirt or residue stuck to the surface. Use as much brake cleaner as you need until both discs look and feel really clean.^{[13]XResearch source}
Grab a sheet of 120-grit sandpaper and rub it all over the sides of your disc rotor.^{[14]XResearch source} Don’t worry, you’re not damaging the disc rotor—you’re actually making it easier for the brake pads to adhere and clamp onto these discs. Once you’re done, the metal surface should feel a little rough.^{[15]XResearch source}

Part 3

Part 3 of 4:

Brake Pads, Calipers, and Levers

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Set your brake pads on a clean, lint-free paper towel sheet. Grab a specialized bicycle brake cleaner and spritz it all over both sides of the pads. Rub the product into the pads with a clean, lint-free paper towel.^{[16]XResearch source}
Grab a sheet of fairly coarse sandpaper and work it back and forth over each pad.^{[17]XResearch source} Rub the pad portion of the brakes onto the sandpaper, using quick, back and forth motions. Your main goal is to smooth off any residue from your brake pads, which will help eliminate the squeaking sound.
Place your pads on another lint-free paper towel sheet and spray them down again. Rub away any leftover pad residue from your brakes, so they’re ready to reinstall into your bike.^{[18]XResearch source}
Search for the caliper in your bike frame—this is the metal pocket that stores your brake pads. Spritz this area with brake cleaning spray, and wipe it down with a clean cloth.^{[19]XResearch source}
Look for the components that hold your bike’s piping together—these are known as the unions, and they need a good clean once in a while. Spritz them with brake cleaner, and wipe them off with a clean rag. Then, spray brake cleaner on the hand brake levers and give them a good wipedown as well.^{[20]XResearch source}

Part 4

Part 4 of 4:

Reassembly

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Sandwich the 2 brake pads together, so both pads are touching one another. Slip the brakes back into the caliper—they should fit snugly.^{[21]XResearch source}
Grab the retaining bolt and slide it through the top of the brake pads.^{[22]XResearch source} Then, place the retaining circlet along the end of the bolt.^{[23]XResearch source}
Center your disc rotor along the center of your bike wheel. Grab a torque wrench and screw the bolts back in. Repeat this process until all of your disc rotors are back in their proper positions.^{[24]XResearch source}
Slide your bike wheel back into place, lining up the center of the wheel with both dropouts. Slide the long bolt back into place, twisting it clockwise so it stays put. Now, your brakes hopefully won’t sound squeaky on your next bike ride!^{[25]XResearch source}

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Tips

Always use a bike-specific brake cleaner, so you don’t damage your equipment.^{[26]XResearch source}
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Warnings

Try not to touch your brake pads or disc rotor with your bare hands. Oils can transfer from your skin and make your brakes less effective.^{[27]XResearch source}
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Don’t press on the hand brakes after you’ve removed your bike tires. This will tighten up your brake pads and make it really tough to reinstall your tires.^{[28]XResearch source}
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Avoid any brake cleaners with the ingredient “PTFE”—this will make your disc rotors slick, and will make it trickier to brake.^{[29]XResearch source}
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