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Disc brake caliper

The caliper holds the brake pads and squeezes them onto the rotor. Match the brake type, mount and pads, and align it carefully so it doesn't rub.

Last edited Nov 8, 2026 by Pedalwise team Edit History Add a subpage

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The caliper is the part of a disc brake that holds the pads and squeezes them onto the rotor. Park Tool's alignment guide explains that the caliper body moves side to side when its mounting bolts are loose, which is how it is centered over the rotor (Park Tool hydraulic disc brake alignment).

Brakes are what stop a heavy, fast e-bike. If you replace a caliper and aren't sure it is set up right, have a shop check it before you ride.

What it's used for

Most rub and squeal is fixed without a new caliper. Park Tool notes that rub can come from a wheel that isn't seated, a bent rotor, play in the rotor or bearings, or sticky pistons, so rule those out first (Park Tool). Replace the caliper when it is cracked, leaks fluid, or has pistons that won't move after service. See E-bike brakes.

What to look for

  • Mechanical or hydraulic. Cable calipers are set up as in Adjust mechanical disc brakes. A hydraulic caliper works with a lever and fluid from the same brake system, so check with the brake maker before mixing parts, and plan to bleed the brakes.
  • Pads and rotor. The caliper takes a specific pad shape, so buy Disc brake pads to match it, and keep the rotor size the frame and fork were built for. See Brake rotor.
  • Alignment. Park Tool's method is to loosen the mounting bolts, squeeze the lever to center the caliper, snug the bolts while holding the lever, then spin the wheel and adjust for rub. It gives about 6 to 8 Nm for the mounting bolts and notes that frame mounts only rarely need facing (Park Tool). Use your brake maker's torque figure where it differs, and see Torque and specs.
  • Brake cutoffs. On e-bikes the motor cutoff usually sits in the lever, not the caliper. See Brake cutoff sensor.

Where to buy

  1. Your bike maker's parts store or support team.
  2. The brake maker's dealers, through a local bike shop.
  3. Independent specialists. Area 13 E-Bikes lists Juintech M1 hydraulic calipers, front and rear, at $149 (read Nov 9, 2026) (Area 13). See Where to buy e-bike repair parts.
  4. A local shop, through find a shop.

Guides that use it

Sources

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Guides that use this

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