How To Bleed 2017 Kawasaki ER650 - Z650 ABS Motorcycle Brakes

Bleeding the Front and Rear Brakes on a 2017 Kawasaki ER650/Z650 ABS

The 2017 Kawasaki ER650/Z650 ABS uses hydraulic disc brakes at both ends, and the ABS badge means an anti-lock braking unit is part of the hydraulic circuit. That matters because a normal bleed at the calipers is the right way to refresh fluid and remove air from the lines, but air trapped inside the ABS unit itself is a different problem. This guide walks you through a careful front and rear bleed on this bike, with the checks that tell you when the job is finished and when it should go to a shop.

When This Bike Needs a Brake Bleed

Bleeding is not only for a brake system that has been opened for a line, caliper, or master cylinder repair. On a street bike like the ER650/Z650 ABS, brake fluid absorbs moisture over time, which lowers its boiling point and makes fade more likely during hard or repeated braking. A lever that feels soft, a pedal that travels farther than it used to, or fluid that looks dark or cloudy in the reservoir are all signs that fresh fluid and a proper bleed are due. Many riders also refresh brake fluid on a regular schedule even when the brakes still feel normal, because the fluid can degrade before the lever gives obvious warning.

Tools and Supplies to Have Ready

• 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 snugly
• Clear tubing that fits tightly over the bleeder valve
• A small catch bottle for used fluid
• Rags or shop towels, plus a syringe or turkey baster for removing old fluid from the reservoir
• A screwdriver or driver that fits the reservoir cap screws
• Optional: a one-way check-valve bleeder or vacuum bleeder, which can make a one-person job easier

Use only fluid from a sealed container, and do not reuse fluid that has been sitting open or drained out of the system. Brake fluid damages paint and plastic quickly, so keep rags close and wipe up any spill immediately.

Set Up a Stable, Protected Workspace

Support the bike securely upright on a stand so it cannot tip while you are working the lever or pedal. For the front brake, turn the handlebars so the reservoir sits level before you open it. Cover the painted bodywork, the instrument area, and any plastic near the reservoir with rags, because a drip of brake fluid can damage those surfaces on contact. If fluid does spill, wipe it up right away and rinse the area with water. Keep the reservoir cap and diaphragm clean and set them where they will not pick up grit.

The Bleeding Sequence, Front and Rear

Work on one hydraulic circuit at a time. The front lever and rear pedal are separate circuits on this model, so bleed the front first, then the rear, or the reverse, but do not mix the two procedures. If your bike has two front calipers, bleed each one in turn; as a general practice, start with the caliper farthest from the master cylinder.

1. With the bike stable and the front reservoir level, remove the reservoir cap and diaphragm. Use a syringe or turkey baster to remove most of the old fluid from the reservoir, but do not let the reservoir run dry and do not let the ports draw air.
2. Refill the reservoir with fresh fluid of the type marked on the cap. Leave enough room for the diaphragm, but keep the fluid level above the ports at all times during the bleed.
3. Fit the clear tubing over the bleeder valve and route the other end into the catch bottle. Position the box-end wrench on the bleeder so you can open and close it without pulling the tubing loose.
4. Squeeze the front lever slowly and hold it firmly against the grip. For the rear, press and hold the pedal. Do not pump rapidly; a slow, steady squeeze moves fluid and air more predictably.
5. With the lever or pedal held, open the bleeder about a quarter turn. You should see fluid and possibly air bubbles move through the clear tube. Close the bleeder before you release the lever or pedal.
6. Release the lever or pedal slowly, then repeat the squeeze-and-hold, open-and-close cycle. Keep checking the reservoir and top it off before it gets low, because letting it run dry can pull air into the system.
7. Continue until the fluid coming through the tube is clean and free of bubbles, and the lever or pedal feels firm. If you are bleeding a second front caliper, repeat the same cycle on that caliper and keep the reservoir topped off.
8. For the rear brake, repeat the same process at the rear bleeder: hold the pedal, open the bleeder briefly, close it before releasing the pedal, and keep the rear reservoir filled to the correct level. Finish when the fluid runs clear and bubble-free.
9. When the bleed is complete, tighten each bleeder snugly without overtightening. Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and wipe away any spilled fluid.
10. Check the bleeder valves and the banjo fittings at the master cylinder and calipers for leaks. A dry fitting after several firm lever or pedal applications is what you want to see.

Finishing Checks and a Low-Speed Test

Before riding, 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 to confirm the brakes are not dragging. Then test the brakes at low speed in a safe area, such as a quiet parking lot, before riding normally. If the lever or pedal feels different from one application to the next, stop and investigate rather than assuming it will improve on the road.

Troubleshooting and When to Visit a Shop

If the lever will not firm up after several bleeding attempts, if it firms only after pumping, or if bubbles keep appearing, there is likely air entering somewhere or a bleed point that is not being cleared. Fluid leaking from the master cylinder or a caliper also means the job should not be ridden until it is repaired. On this ABS-equipped model, if the reservoir ran dry, if the ABS unit or its lines were disconnected, or if you suspect air has entered the ABS unit itself, a standard caliper bleed may not be enough. That situation can require a dealer-level procedure or diagnostic tool, so it is the right time to send the bike to a shop rather than continuing to guess.

Related Shopping Categories

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Shop Brake Tools for a 2017 Kawasaki ER650 - Z650 ABS 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.