Brake pad adjustment is a straightforward job you can do at home with basic tools
Brake pads wear down over time and need to be repositioned or replaced to keep your brakes working safely. The pads should sit flush against the rim or rotor when you squeeze the brake lever, with a small gap (usually 1 to 2 millimeters) when the brakes are released. If your pads are rubbing constantly, hitting the tire, or require a hard squeeze to stop, adjustment is the first step before you consider replacing them.
Most bicycles use one of two brake systems: rim brakes (which squeeze pads against the wheel rim) or disc brakes (which squeeze pads against a rotor attached to the hub). The adjustment process differs between them, but both are manageable without a bike shop visit if you have the right tools and a few minutes of time.
Key Takeaways
- Brake pads should have a small gap when released and contact the rim or rotor fully when squeezed, without rubbing the tire.
- Rim brake pads are adjusted by loosening the mounting bolt, repositioning the pad, and tightening it back in alignment with the rim.
- Disc brake pads are adjusted by loosening the caliper bolts and centering the caliper so the pads sit evenly on both sides of the rotor.
- You will need a hex wrench (Allen key) that fits your brake bolts, and possibly a screwdriver, depending on your brake type.
- If pads are worn down to the backing plate or metal, replacement rather than adjustment is necessary.
Check pad wear and alignment before you adjust
Spin the wheel slowly and watch the brake pad from the side. If the pad is worn down so far that you see only metal backing or a thin sliver of rubber, the pads need replacement, not adjustment. If the rubber is still visible but uneven—thicker on one side than the other—adjustment can help, but severe wear means you should replace them.
Look at where the pad sits relative to the rim or rotor. The pad should be parallel to the braking surface, not angled or twisted. If the pad is hitting the tire on a rim brake, or if one pad is closer to the rotor than the other on a disc brake, adjustment is the fix. Spin the wheel and listen for rubbing; a constant scraping sound means the pads are too close and need backing off.
Adjusting rim brake pads
Locate the mounting bolt that holds each brake pad to the brake arm. This bolt is usually on the outside of the brake assembly and requires a hex wrench (typically 5mm). Loosen the bolt by a quarter turn—do not remove it completely, just enough that the pad can move.
Squeeze the brake lever gently so the pad contacts the rim, then hold it in place while you tighten the bolt. This ensures the pad is positioned exactly where it will be when you brake. Release the lever and check the gap; there should be a small space between the pad and rim. If the pad is still rubbing, loosen the bolt again and pull the pad slightly away from the rim before re-tightening.
Check that the pad is parallel to the rim and not angled. If the top of the pad is closer to the rim than the bottom (or vice versa), loosen the bolt, adjust the angle, and tighten again. Repeat this process for the other pad. Spin the wheel and squeeze the brake lever several times to confirm both pads contact evenly and the wheel spins freely when released.
Adjusting disc brake pads
Disc brakes use a caliper (the assembly that holds both pads) mounted to the frame or fork. If the pads are rubbing or uneven, the caliper itself may be misaligned. Locate the two bolts that attach the caliper to the frame or fork—these are usually 5mm or 6mm hex bolts.
Loosen both bolts by a quarter turn each, but do not remove them. Squeeze the brake lever so the pads center themselves on the rotor, then hold the lever in place while you tighten both bolts evenly. This centers the caliper so both pads sit at equal distance from the rotor. Release the lever and spin the wheel; there should be no rubbing sound.
If one pad is still closer to the rotor than the other after this step, loosen the bolts again and gently tap the caliper with a plastic mallet or the handle of a screwdriver to shift it slightly. Re-center by squeezing the lever and tightening the bolts. Some disc brake calipers also have a small set screw on the side that fine-tunes pad spacing; check your brake manual to see if yours does, as this screw is adjusted with a small hex wrench or screwdriver.
When to replace pads instead of adjusting
If the pad material is worn down to the metal backing plate, or if only a thin sliver of rubber remains, adjustment will not restore braking power. Pads that are severely worn will not grip the rim or rotor effectively, and continuing to use them risks damage to the rim or rotor itself.
Replacement pads are inexpensive and come in sets for rim or disc brakes. Installation involves removing the old pad (usually by unbolting it or sliding it out of a holder), inserting the new pad, and positioning it the same way you would adjust an existing pad. If you are unsure which pad type your bike uses, take a photo of the brake assembly and show it to a bike shop staff member, who can confirm the part number you need.
Testing your brakes after adjustment
After adjusting, squeeze the brake lever firmly several times while the bike is stationary. The lever should feel solid and not travel all the way to the handlebar. If it does, the pads may be too far from the rim or rotor, or the cable may need tightening—this is a separate adjustment that a bike shop can handle if you are not comfortable with it.
Take the bike for a slow test ride in a safe, empty space like a parking lot. Brake gently and then firmly to confirm the pads engage smoothly and the bike stops predictably. Listen for any rubbing or squeaking; a small amount of noise is normal, but constant rubbing means the pads need another adjustment. If the brakes feel spongy or unresponsive after adjustment, the cable may need tension, and you should have a mechanic check it.
Tools and materials you will need
A hex wrench set (Allen keys) is essential; most brake bolts are 5mm or 6mm, so having both sizes on hand saves trips. A screwdriver (flathead or Phillips, depending on your brake type) may be needed if your brakes have adjustment screws. A plastic mallet or rubber hammer helps tap the caliper into position on disc brakes without damaging it, though the handle of a screwdriver works in a pinch.
Some riders find it helpful to mark the original pad position with a marker before loosening bolts, so they have a reference point if the first adjustment does not work. A bike stand or a way to find the bike upside down (so the wheel hangs freely) makes the job easier, though you can also have someone hold the bike steady while you work.
Frequently Asked Questions
How often do brake pads need adjustment?
Pads wear gradually, so adjustment may be needed every few months to a year depending on how often you ride and your braking style. Check them monthly by spinning the wheel and listening for rubbing. If you hear constant scraping, adjustment is due.
Can I adjust the brake cable at the same time as the pads?
Pad position and cable tension are separate adjustments. Adjust the pads first so they sit correctly on the rim or rotor. If the brake lever still feels too soft or travels too far after pad adjustment, the cable needs tightening—this is done at the barrel adjuster (a threaded collar on the brake cable) and is a different task.
What if the pads are rubbing on one side only?
On rim brakes, loosen the pad bolt and shift the pad slightly away from the rubbing side before re-tightening. On disc brakes, loosen the caliper bolts, tap the caliper gently to shift it, squeeze the brake lever to center it, and re-tighten. This usually solves one-sided rubbing.
Do I need to bleed hydraulic disc brakes after adjusting the pads?
No. Bleeding (removing air from the brake lines) is only necessary if the lever feels spongy or if you have opened the brake lines. Pad adjustment does not require bleeding. If the lever feels soft after adjustment, the issue is likely cable tension or air in the lines, not the pad position.
What is the right gap between the pad and rim or rotor?
Typically 1 to 2 millimeters when the brake is released. You can estimate this by eye—the gap should be small enough that you cannot fit a thick piece of paper between the pad and braking surface, but large enough that the pad does not touch when you spin the wheel freely.