Bleeding the Brakes on a 2017 Kawasaki ER650/Z650
Shop parts for a 2017 Kawasaki ER650 - Z650 Motorcycle.
The 2017 Kawasaki ER650/Z650 uses hydraulic disc brakes at both ends, so the front lever and the rear pedal both depend on clean, air-free fluid to deliver a firm, predictable brake feel. ABS was available on this model year, so check your bike for an ABS indicator or badge before you begin. The basic caliper bleed is the same either way, but ABS adds an important caveat if air has entered the ABS unit itself. This guide covers a full fluid flush and air bleed for a DIY rider with basic hand tools and moderate mechanical confidence.
When These Brakes Need Bleeding
A spongy or soft front lever, a rear pedal that feels longer or less positive than it used to, or a lever that pulls closer to the grip are all signs that air or old fluid is affecting the system. Dark, cloudy, or contaminated fluid in the reservoir is another reason to service the brakes. Bleeding is also due after any work that opened the hydraulic system, such as replacing a brake line, servicing a caliper, or repairing the master cylinder.
Even when the brakes feel normal, brake fluid absorbs moisture over time. That moisture lowers the fluid’s boiling point and can contribute to brake fade under hard or repeated use. Many riders refresh the fluid on a regular schedule as preventive maintenance rather than waiting for a soft lever. On the 2017 ER650/Z650, treat both the front and rear hydraulic systems as part of the same service if the fluid in either reservoir looks tired.
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
- Clear tubing that fits snugly over the bleeder valve
- A clean catch bottle for used 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 neither is required. Have everything within reach before you open the reservoir, because once the cap is off you do not want to stop midway to hunt for a tool.
Set Up and Protect the Bike
Support the motorcycle securely upright on a stand so the reservoirs sit level. Turn the handlebars as needed so the front reservoir is level before you open it. Cover painted surfaces, plastic bodywork, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. If fluid spills, wipe it up immediately and rinse the area with water.
Remove the reservoir cap and diaphragm, then use the syringe or turkey baster to pull most of the old fluid out of the reservoir. Leave a small amount at the bottom so you do not introduce air through the master cylinder. Refill with fresh fluid from the sealed container, keeping the level well above the minimum mark. Do not let the reservoir run dry at any point during the bleed.
The Bleeding Procedure
Work on one hydraulic circuit at a time. If your bike has two front calipers, bleed one caliper completely before moving to the other. A common general practice is to start with the caliper farthest from the master cylinder in the plumbing, then finish with the closer one. The rear brake is a separate circuit and gets its own bleed at the rear caliper.
- Open the front reservoir, remove most of the old fluid, and top off with fresh fluid of the type marked on the cap.
- Fit the box-end wrench onto the front bleeder valve, then push the clear tubing onto the bleeder and route the other end into the catch bottle.
- Squeeze the front brake lever and hold it firmly against the grip.
- Open the bleeder about a quarter turn and let fluid and air escape through the tubing. Close the bleeder before you release the lever.
- Release the lever slowly, then check the reservoir level and top it off with fresh fluid.
- Repeat the squeeze, hold, open, close, and release sequence until fresh, clean fluid comes through the tube with no visible bubbles.
- If your bike has a second front caliper, repeat the same sequence on that caliper, keeping the reservoir topped off throughout.
- Move to the rear brake. Fit the wrench and tubing onto the rear bleeder, press and hold the rear pedal, open the bleeder about a quarter turn, and close it before releasing the pedal.
- Repeat the rear sequence until clean, bubble-free fluid comes through, topping off the rear reservoir as needed so it never runs low.
- When both circuits are done, tighten each bleeder snugly without overtightening, check the fluid level at each reservoir, and reinstall the diaphragm and cap.
ABS and Shop-Level Situations
If your 2017 ER650/Z650 is ABS-equipped, a standard bleed through the caliper bleeders is generally used to refresh fluid and remove air from the calipers and lines. However, if the reservoir has run dry, the ABS unit or its lines have been disconnected, or the lever never firms up after several bleeding attempts, air may be trapped in the ABS unit itself. That situation may require a dealer-level procedure or diagnostic tool. Do not attempt to force fluid through the ABS unit or invent a bleed sequence; take the bike to a qualified shop.
Finishing Up and Testing Before Riding
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. Make a few gentle stops and confirm the lever and pedal feel the same each time. If anything changes, or if the lever firms up only after pumping, stop and investigate before riding at speed.
Troubleshooting and When to See a Shop
A lever that will not firm up after several bleeding attempts, persistent air bubbles in the tubing, fluid leaking from the master cylinder or caliper, or a lever that only feels firm after pumping all point to a problem that may be beyond a simple bleed. Stop and have the system inspected. Also take the bike to a shop if you suspect air has entered an ABS unit, if a line or fitting is damaged, or if you are not confident that the system is holding pressure correctly. Brakes are safety-critical, and a correct bleed is worth the extra time or the cost of professional help.
Related Shopping Categories
Shop Brake Fluid for a 2017 Kawasaki ER650 - Z650 Motorcycle.
Shop Brake Lines for a 2017 Kawasaki ER650 - Z650 Motorcycle.
Shop Brake Pads for a 2017 Kawasaki ER650 - Z650 Motorcycle.
Shop Stands for a 2017 Kawasaki ER650 - Z650 Motorcycle.
Shop Brake Tools for a 2017 Kawasaki ER650 - Z650 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.