How to Bleed the Brakes on a 2020 Kawasaki W800 Cafe
Shop parts for a 2020 Kawasaki EJ800 - W800 Cafe Motorcycle.The 2020 Kawasaki EJ800 W800 Cafe uses hydraulic disc brakes at both ends and is equipped with ABS. For routine service, that means you can refresh fluid and remove air at the calipers with a normal bleed. The ABS unit only becomes a concern if the reservoir has run dry or the ABS unit or its lines have been disconnected. If either of those has happened, read the ABS note near the end before you open anything. Otherwise, this is a straightforward job for a rider with moderate mechanical confidence, fresh fluid, and a little patience.
When the W800 Cafe Needs a Brake Bleed
Bleeding is due when the front lever or rear pedal feels spongy, when the lever pulls closer to the grip than it used to, or when the fluid in the reservoir looks dark or cloudy. It is also required after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work. Even without symptoms, brake fluid absorbs moisture over time. Moisture lowers the fluid’s boiling point, which can lead to brake fade under hard or repeated use. Many riders refresh the fluid on a regular schedule for that reason alone. On the W800 Cafe, treat the front and rear systems as separate hydraulic circuits and bleed each one properly.
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
- Clear tubing that fits snugly over the bleeder valve
- A catch bottle for old 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 makes one-person bleeding easier
Do not substitute an open-end wrench for the bleeder if you can avoid it. A box-end wrench grips the bleeder more securely and reduces the chance of rounding it. Keep the fluid container capped when you are not pouring, and do not reuse fluid that has been sitting open.
Preparation and Paint Protection
Support the bike securely upright on a stand so it cannot tip while you are working. Turn the handlebars so the front reservoir sits level before you remove the cap. Cover the painted surfaces, plastics, and 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. Remove the reservoir cap and diaphragm carefully, set them on a clean towel, and use the syringe or turkey baster to take most of the old fluid out of the reservoir without letting the level drop low enough to draw air into the master cylinder.
Bleeding the Front Brake
Work methodically and keep the reservoir topped off throughout. If your bike has more than one front caliper, treat each caliper as its own bleed point and finish one before moving to the next. As a general practice, start with the caliper farthest from the master cylinder if the circuit has more than one caliper.
- Refill the front reservoir with fresh fluid of the type marked on the cap.
- Fit the clear tubing over the front caliper bleeder valve and route the other end into the catch bottle.
- Squeeze and hold the front lever firmly.
- Open the bleeder about a quarter turn and let fluid and air escape through the tube.
- Close the bleeder before you release the lever. This is critical; releasing the lever with the bleeder open can pull air back into the system.
- Release the lever slowly, then check the reservoir level and top it off.
- Repeat the squeeze, hold, open, close, and release sequence until fresh, clean fluid comes through the tube with no bubbles.
- Keep checking the reservoir after every few strokes so it never runs low enough to draw air.
- When the fluid runs clear and bubble-free, close the bleeder snugly without overtightening it.
- Refill the reservoir to the correct level marking, then reinstall the diaphragm and cap.
Bleeding the Rear Brake
The rear brake on this W800 Cafe is also hydraulic, so it needs the same treatment. Set the bike upright and make sure the rear reservoir is level and accessible. Protect the surrounding paint and plastic before opening it.
- Remove most of the old fluid from the rear reservoir and refill with fresh fluid.
- Attach the clear tubing to the rear caliper bleeder and route it into the catch bottle.
- Press and hold the rear brake pedal.
- Open the bleeder about a quarter turn to let fluid and air out.
- Close the bleeder before releasing the pedal.
- Release the pedal, top off the reservoir, and repeat until the fluid is clean and free of bubbles.
- Finish by tightening the bleeder snugly without overtightening, then refill the reservoir to the correct level and reinstall the diaphragm and cap.
Finishing, Testing, and When to Stop
Clean any spilled fluid from the reservoir, caliper, and bleeder area. Check for leaks at the bleeder 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. Test the brakes at low speed in a safe area before riding normally.
If the lever or pedal will not firm up after several bleeding attempts, if it firms up only after pumping, if bubbles keep appearing, or if fluid is leaking from the master cylinder or caliper, stop and have the bike inspected. Because this W800 Cafe has ABS, air that has entered the ABS unit itself may require a dealer-level procedure or diagnostic tool. A standard caliper bleed is fine for routine fluid refresh, but if the reservoir ran dry or the ABS unit or its lines were disconnected, take the bike to a shop rather than trying to force a pedal or lever to firm up at home.
Related Shopping Categories
Shop Brake Fluid for a 2020 Kawasaki EJ800 - W800 Cafe Motorcycle.
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Shop Stands for a 2020 Kawasaki EJ800 - W800 Cafe Motorcycle.
Shop Brake Tools for a 2020 Kawasaki EJ800 - W800 Cafe 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.
