Bleeding the Brakes on a 2013 Kawasaki Ninja 650 EX650

Shop parts for a 2013 Kawasaki EX650 - Ninja 650 Motorcycle.

What This Job Covers on the EX650

The 2013 Kawasaki Ninja 650 EX650E uses hydraulic disc brakes at both ends. The front lever and rear pedal each operate their own master cylinder, line, and caliper circuit. This EX650E is the non-ABS version, so there is no ABS hydraulic unit in the bleed path. That keeps the job to a straightforward caliper bleed, but it remains safety-critical. Bleeding removes old fluid and trapped air so the lever and pedal can apply full pressure. This article covers a fluid flush and air removal only; pad, rotor, caliper, and line replacement are separate jobs, though any of those can be why you need to bleed afterward.

When to Bleed and Why Old Fluid Matters

Bleed the brakes when the front lever feels spongy or pulls closer to the grip, when the rear pedal feels soft or travels farther before it bites, or when fluid in either reservoir looks dark or cloudy. You also need to bleed after any work that opened the hydraulic system, such as a new line, caliper service, or master cylinder work. Even without symptoms, brake fluid absorbs moisture over time. That moisture lowers its boiling point, and under hard or repeated braking it can create vapor and cause fade or an inconsistent lever. A periodic flush is cheap insurance for a bike ridden in traffic, rain, or with enthusiasm.

Tools and Supplies to Gather

  • Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container
  • A box-end wrench that fits the bleeder snugly
  • Clear tubing that fits tightly over the bleeder nipple
  • A small catch bottle for used fluid
  • Rags or shop towels, plus a syringe or turkey baster for removing old reservoir fluid
  • The correct driver for the reservoir cap screws
  • Optional: a one-way check-valve bleeder or vacuum bleeder to make one-person work easier

Do not substitute a different fluid type just because it is on the shelf. Use what the cap specifies, and keep the container closed between top-offs so it does not pull moisture from the air.

Setting Up Safely and Protecting the Bike

Put the motorcycle on a stable stand so it is upright and cannot tip while you work the lever or pedal. For the front circuit, turn the handlebars so the reservoir sits level before removing the cap. Brake fluid damages paint and many plastics, so drape rags over the tank or bodywork, the instrument area, and any painted surface below the reservoir and bleeder. If a drop lands on paint or plastic, wipe it up immediately and rinse with water. Remove the reservoir cap and diaphragm, then use the syringe or baster to pull most of the old fluid out without letting the reservoir run dry. Refill with fresh fluid before bleeding, and check the level after every few pump cycles.

Bleeding the Front Brake Circuit

Work calmly and keep the reservoir from running low enough to draw air. If your bike has more than one front caliper, bleed each caliper separately, starting with the one farthest from the master cylinder in hydraulic terms.

  1. Remove most of the old fluid from the front reservoir, then fill with fresh fluid to the upper level marking.
  2. Fit the clear tube over the front bleeder and route the other end into the catch bottle. Position the box-end wrench on the bleeder.
  3. Squeeze the front lever slowly and hold it firmly against the grip.
  4. Open the bleeder about a quarter turn. Fluid and any air will move through the tube; watch for bubbles.
  5. Close the bleeder before you release the lever. This is the critical order—releasing first can pull air back into the caliper.
  6. Release the lever slowly, then repeat the squeeze-hold-open-close-release cycle.
  7. Check the reservoir after every few cycles and top it off with fresh fluid. Never let it empty.
  8. Continue until the fluid coming through the tube is clean and free of bubbles, and the lever feels firm.
  9. If there is a second front caliper, repeat the same process on it, then recheck the first caliper if the lever still feels soft.
  10. Finish by closing the bleeder snugly—firm, but not so tight that you damage the bleeder or caliper.

Bleeding the Rear Brake Circuit

The rear brake on this EX650 is also hydraulic, so it uses the same basic method with the foot pedal instead of the lever. Keep the rear reservoir topped off and protect the surrounding bodywork from fluid drips.

  1. Open the rear reservoir, remove most of the old fluid, and refill with fresh fluid of the type marked on the cap.
  2. Attach the clear tube to the rear bleeder and place the wrench on the bleeder.
  3. Press the rear pedal and hold it down.
  4. Open the bleeder about a quarter turn, let fluid and air escape, then close the bleeder before releasing the pedal.
  5. Release the pedal slowly and repeat the press-hold-open-close-release sequence.
  6. Top off the reservoir frequently so it never draws air.
  7. Keep going until the fluid in the tube is clean and bubble-free and the pedal feels solid.
  8. Tighten the bleeder snugly and wipe away any fluid around the caliper.

Finishing, Testing, and When to Get Help

When both circuits are bled, fill each reservoir to the correct level marking, reinstall the diaphragm and cap, and clean up any spilled fluid. Check the bleeders and the banjo fittings at the master cylinder and caliper for weeping or wetness. The front lever and rear pedal should feel firm and consistent, not spongy, and they should not slowly sink while you hold steady pressure. Spin each wheel by hand to confirm the brakes are not dragging. Before riding normally, test the brakes at low speed in a safe, open area and make sure they engage smoothly and release completely.

If the lever or pedal will not firm up after several careful bleeding attempts, if it firms only after repeated pumping, if bubbles keep appearing, or if you see fluid leaking from the master cylinder or caliper, stop and have the system inspected. A brake system that will not hold pressure is not safe to ride. If you are working on an ABS-equipped Ninja 650 rather than this non-ABS EX650E, a normal caliper bleed can still refresh fluid, but air that has entered the ABS unit may require a dealer-level procedure or diagnostic tool; that is a job for a shop rather than a guess in the garage.

Related Shopping Categories

Shop Brake Fluid for a 2013 Kawasaki EX650 - Ninja 650 Motorcycle.

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Shop Stands for a 2013 Kawasaki EX650 - Ninja 650 Motorcycle.

Shop Brake Tools for a 2013 Kawasaki EX650 - Ninja 650 Motorcycle.

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.