How to Change Brake Pads on a 2017 KTM 250EXCF Dirt Bike

Shop parts for a 2017 KTM 250EXCF Dirt Bike.

Quick braking system overview

Most modern dirt bikes including the 2017 KTM 250EXCF use hydraulic disc brakes: a brake lever or pedal operates a master cylinder that pressurizes fluid through a hydraulic line to a caliper. The caliper squeezes brake pads against a steel rotor to convert kinetic energy into heat and slow the bike. Key components you will touch during a pad change are the lever or pedal, master cylinder, brake hose, caliper, brake pads, pad retaining pin or clip, and the rotor.

When to replace brake pads – common signs

  • Reduced braking power or longer stopping distances.
  • Squealing, squeaking, or grinding noises when applying brakes.
  • Excessive lever or pedal travel before engagement.
  • Visible pad material worn thin – less than 1.5-2 mm of friction material is a good rule of thumb to swap pads.
  • Heat discoloration, deep scoring, or grooving on the rotor.

Inspect pads more often after muddy rides, long motocross sessions, or trail rides where grit accelerates wear.

Tools & parts you'll need

  • New brake pads specific to the 2017 KTM 250EXCF
  • Socket set or wrenches for axle and caliper hardware
  • Needle-nose pliers or flat screwdriver for retaining clip/pin
  • Small C-clamp or a clean piston-compressing tool (or a wide, flat screwdriver with care)
  • Clean shop rags, isopropyl alcohol or brake cleaner
  • Latex gloves and a tub to keep small parts
  • Bike stand to support the KTM 250EXCF securely

Step-by-step – changing the pads on your KTM 250EXCF

  1. Prepare the bike and workspace. Park the KTM 250EXCF on a flat surface and secure it on a stand so the wheels can turn freely. Have rags and tools within reach.
  2. Remove the wheel if needed. Many riders find it easier to change pads with the wheel off, especially on the front where the axle and fork can block access. For rear pads you can sometimes change them with the wheel in place depending on caliper layout. Loosen axle hardware and slide the wheel out carefully.
  3. Locate the pad retaining pin or clip. On the KTM 250EXCF caliper you'll find a small retaining pin or clip holding pads in place. Use pliers or a screwdriver to remove the clip, then slide out the pin. Keep parts in your tray so nothing gets lost.
  4. Slide old pads out. Pull the worn pads straight out of the caliper carrier. Note pad orientation and any shims so you reinstall new pads the same way.
  5. Inspect rotor & caliper. Look for deep grooves, blueing (heat discoloration), or contamination on the rotor. Check the caliper bore area for debris, and ensure the caliper slides move freely on their pins or mounting points.
  6. Compress the caliper piston(s). Open the master cylinder reservoir cap slightly to relieve pressure if necessary. Use a C-clamp or piston tool to slowly compress the piston(s) back into the caliper until there is room for the new thicker pads. Be careful not to spill fluid back out of the master cylinder.
  7. Clean mating surfaces. Use brake cleaner or isopropyl alcohol on a rag to wipe the rotor rubbing surfaces and the caliper area. Do not contaminate new pads with oil or grease.
  8. Install the new brake pads. Place the pads into the caliper in the same orientation as the old ones. Make sure any anti-rattle shims sit properly and that pad backing plates contact the caliper correctly.
  9. Reinstall retaining pin or clip. Slide the retaining pin back through the caliper and pads, then secure the clip. Verify the pin is fully seated and the clip is tight so pads cannot shift.
  10. Reinstall the wheel and tighten axle hardware. Refit the wheel on the KTM 250EXCF, torque axle nuts and pinch bolts to spec feel – tighten incrementally and ensure the caliper lines up with the rotor without rubbing at rest.
  11. Restore hydraulic pressure. Pump the brake lever or pedal several times until firm to move the piston(s) up against the new pads and restore hydraulic feel. Check that lever travel is normal and there are no soft or spongy sensations.
  12. Final checks. Spin the wheel to ensure there is a small, even drag only when the lever is applied – if rubbing persists, recheck caliper alignment and pad fitment.

Helpful inspection tips while you're in there

  • Measure rotor thickness visually & by feel; deep grooves or a knife-edge lip around the rotor perimeter indicate replacement or resurfacing is needed.
  • Look for any brake fluid leaks around the caliper piston seals or hose fittings – fluid presence means service beyond pad change may be needed.
  • Ensure caliper sliding pins move freely & are not seized; stuck slides cause uneven pad wear.
  • Clean mud, grit, and compressed dirt from the caliper bracket and pad slots to avoid sticking.
  • Verify retaining pins, clips, and spring hardware are intact and secure after installation.

Bedding in new pads

Bedding transfers an even layer of pad material to the rotor for consistent braking. Perform roughly 8–12 controlled stops from moderate speed to walking pace, allowing the brakes to cool briefly between repeated stops. Avoid hard emergency stops during the first few miles; instead, use progressive braking to bring the pads and rotor up to temperature and mate surfaces evenly.

Notes on KTM 250EXCF braking setups

The 2017 KTM 250EXCF is an enduro-style 250cc machine that demands confident braking for varied terrain. Most machines in this class use hydraulic disc brakes with a single caliper per wheel; caliper and rotor sizes can vary by generation but the general pad-change procedure is the same. Because enduro and trail riding load the brakes differently than street bikes, check pads more frequently after long steep descents or prolonged technical sections.

Wrap-up

Changing pads on your 2017 KTM 250EXCF is a straightforward garage procedure with basic tools. Regular inspections, cleaning, and timely pad replacement keep braking performance strong and predictable so you can ride with confidence and control.

Related Shopping Categories

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Shop Brake Tools for a 2017 KTM 250EXCF Dirt Bike.

Disclaimer: This guide is provided for general informational purposes only and is not intended to replace your motorcycle's official owner's manual. Always refer to your manufacturer's documentation for model-specific instructions, torque specifications, safety procedures, and maintenance requirements. If you are unsure or inexperienced, consider seeking assistance from a qualified mechanic or technician.