Bleeding the Brakes on a 2016 Kawasaki EX650 Ninja 650

Shop parts for a 2016 Kawasaki EX650 - Ninja 650 Motorcycle.

The 2016 Kawasaki EX650 Ninja 650 uses hydraulic disc brakes at both ends, so the front lever and the rear pedal each act on a fluid-filled circuit. That makes a fluid flush and air bleed a practical garage job once the bike is stable and the painted and plastic surfaces are protected. Some 2016 EX650s were delivered with ABS and some without, so check your bike for the ABS indicator and the tone ring at the wheel before you begin. A standard bleed at the caliper bleeder is still the way to refresh fluid, but if the reservoir has run dry or the ABS unit or its lines have been opened, air may be trapped where a hand bleed cannot reach it. In that case, stop and have a shop perform the ABS service.

When the Brakes Need Bleeding

A spongy front lever, a rear pedal that feels soft or travels farther than it used to, or a lever that pulls closer to the grip are the classic signs that air is in the system. Dark or cloudy fluid in the reservoir is another reason to flush. Brake fluid absorbs moisture over time, which lowers its boiling point and can lead to brake fade under hard use, so many riders refresh the fluid on a regular schedule even when the brakes still feel normal. Bleeding is also required after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work.

Tools and Supplies to Gather

  • Fresh brake fluid of the type marked on the master cylinder reservoir cap, from a sealed container
  • A box-end wrench that fits the bleeder valve
  • A length of clear tubing that fits snugly over the bleeder
  • A catch bottle for old fluid
  • Rags or shop towels
  • A syringe or turkey baster for removing old fluid from the reservoir
  • A screwdriver or driver that fits the reservoir cap screws

A one-way check-valve bleeder or a vacuum bleeder can make the job easier when you are working alone, but the manual lever-and-bleeder method works fine with a little patience.

Preparing the Bike and Work Area

Support the EX650 securely upright on a stand so it cannot tip while you are working at the handlebar and calipers. Turn the handlebars so the front reservoir sits level before you open it. Cover painted surfaces, plastics, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. If a spill happens, wipe it up immediately and rinse the area with water. Keep the old fluid separate from the fresh container and do not reuse it.

Bleeding the Front Brake Circuit

The front master cylinder is at the handlebar, and the caliper bleeder is at the front wheel. If your bike has two front calipers, treat them as separate jobs and bleed one fully before moving to the other; a common starting point is the caliper farthest from the master cylinder. Keep the reservoir topped off throughout the procedure so it never draws air.

  1. Remove the reservoir cap and diaphragm, then use the syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
  2. Refill the reservoir with fresh fluid of the type marked on the cap, leaving enough room to add more as you work.
  3. Fit the box-end wrench onto the bleeder valve, then push the clear tubing onto the bleeder and route the other end into the catch bottle. Keep the tube end submerged in a little fluid if possible.
  4. Squeeze the front lever slowly and hold it firm. Do not release it while the bleeder is open.
  5. Open the bleeder about a quarter turn and let fluid and air escape through the tube. Close the bleeder before the lever reaches the grip or before you release it.
  6. Release the lever slowly, check the reservoir level, and top it off. Repeat the squeeze-hold-open-close-release sequence until fresh, clean, bubble-free fluid comes through the tube.
  7. If there is a second front caliper, repeat the entire sequence on that caliper, keeping the reservoir above the minimum mark.
  8. When finished, close the bleeder snugly without overtightening, fill the reservoir to the correct level marking, and reinstall the diaphragm and cap.

Bleeding the Rear Brake Circuit

The rear brake is also hydraulic on this model, so it uses the same basic method with the rear pedal and rear caliper bleeder. Work with the bike stable and the rear reservoir accessible, and protect nearby bodywork before opening anything.

  1. Check the rear reservoir, remove most of the old fluid, and refill with fresh fluid from the sealed container.
  2. Attach the box-end wrench, clear tubing, and catch bottle to the rear bleeder.
  3. Press the rear pedal and hold it firm.
  4. Open the bleeder about a quarter turn, let fluid and air out, and close the bleeder before releasing the pedal.
  5. Release the pedal, top off the reservoir, and repeat until the fluid runs clean and bubble-free.
  6. Finish by tightening the bleeder snugly without overtightening, setting the reservoir to the correct level, and reinstalling the diaphragm and cap.

Finishing Checks and Test Ride

Clean any spilled fluid from the reservoir, calipers, and surrounding surfaces. Check for leaks at the bleeder valves and at the banjo fittings. The front lever and rear pedal should feel firm and consistent, not spongy, and they should not slowly sink under steady pressure. Spin each wheel to confirm the brakes are not dragging. Before riding normally, test the brakes at low speed in a safe area.

If the Brakes Will Not Firm Up

If the lever or pedal will not firm up after several bleeding attempts, if it firms only after pumping, if air bubbles keep appearing, or if fluid is leaking from the master cylinder or caliper, stop and have the bike inspected. The same applies if air may have entered an ABS unit. A spongy brake is not a normal condition to ride with, and a system that will not hold pressure needs professional attention before the bike goes back on the road.

Related Shopping Categories

Shop Brake Fluid for a 2016 Kawasaki EX650 - Ninja 650 Motorcycle.

Shop Brake Lines for a 2016 Kawasaki EX650 - Ninja 650 Motorcycle.

Shop Brake Pads for a 2016 Kawasaki EX650 - Ninja 650 Motorcycle.

Shop Stands for a 2016 Kawasaki EX650 - Ninja 650 Motorcycle.

Shop Brake Tools for a 2016 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.