Bleeding the Brakes on a 2017 Kawasaki Ninja H2
Shop parts for a 2017 Kawasaki Ninja H2 Motorcycle.
What You Are Working On
The 2017 Kawasaki Ninja H2 stops on hydraulic disc brakes at both wheels, and it is fitted with an anti-lock braking system. Fluid leaves the front master cylinder at the lever and the rear master cylinder at the pedal, passes through lines that route into the ABS modulator, and arrives at the calipers. For a routine fluid refresh, or a bleed after a line swap or caliper service, you work at the caliper bleeder screws just as you would on any hydraulic bike. The front end carries two calipers, so treat each one as its own bleed point and do them one at a time. This machine does not use a linked or combined braking system, which means the front lever and the rear pedal are separate circuits and each gets bled on its own.
When a Bleed Is Actually Due
Brake fluid is hygroscopic, meaning it pulls moisture out of the air over time. That moisture lowers the fluid's boiling point, and a fluid that boils under hard use creates vapor in the lines — which feels exactly like air and behaves exactly as badly. On a supercharged machine like the H2, where speeds build quickly and brakes get worked hard, that margin matters. Many riders simply refresh the fluid on a set interval rather than waiting for a symptom.
Beyond scheduled maintenance, bleed the system whenever the lever or pedal feels soft or spongy, when the lever travels closer to the grip than it used to, when the fluid in the reservoir looks dark or cloudy, or after any job that opened the hydraulic circuit — new lines, a caliper rebuild, or master cylinder work. A lever that firms up only after two or three quick pumps is a classic sign that air is in the system.
Gather These Tools and Supplies
- Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container. Do not substitute a different type.
- A box-end wrench that fits the bleeder valve snugly. A box-end grips the hex far better than an open-end and is much less likely to round it off.
- A length of clear tubing that fits tightly over the bleeder nipple, plus a small catch bottle to hang it in.
- Rags or shop towels, and a syringe or turkey baster for pulling old fluid out of the reservoir.
- The correct driver for the reservoir cap screws.
- Optional but genuinely helpful: a one-way check-valve bleeder or a vacuum bleeder, either of which makes a solo bleed far less fiddly.
Set Up Before You Open the Reservoir
Get the bike secure first. Put it on a stand so it sits upright and cannot tip while you are leaning on the lever. Turn the handlebar so the front reservoir sits level — a reservoir that is tilted will spill the moment the cap comes off. Then drape rags over the tank, the upper fairing, the instrument cluster, and anything else below the reservoir. Brake fluid attacks paint and most plastics on contact, and the damage is permanent. If a drop does land somewhere it should not, wipe it up immediately and rinse the area with water rather than waiting until you finish.
Work in a ventilated space and keep the fluid container capped whenever you are not pouring from it, since an open bottle absorbs moisture from the air.
The Bleeding Procedure
- Wipe the reservoir cap and the area around it clean so no grit falls in, then remove the cap and the diaphragm.
- Use the syringe or baster to draw most of the old fluid out of the reservoir. Leave enough at the bottom that you are not pulling air into the master cylinder port.
- Top the reservoir up with fresh fluid from the sealed container.
- Push the clear tubing onto the bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tube end stays submerged.
- Fit the box-end wrench onto the bleeder.
- Squeeze the front lever and hold it firm, or press and hold the rear pedal. Do not release it yet.
- Open the bleeder about a quarter turn. Fluid and any trapped air will push out through the tube. Watch the tube, not the reservoir.
- Close the bleeder before you release the lever or pedal. Releasing with the bleeder open draws air straight back into the caliper.
- Release the lever or pedal slowly, then repeat the squeeze–hold–open–close–release cycle. Check the reservoir level every few cycles and top it off. Never let it run low enough to pull air in — that turns a ten-minute job into a long one.
- Keep cycling until the fluid coming through the tube is clean, bright, and completely free of bubbles.
- If you are bleeding the front, move to the second caliper and repeat the entire sequence. As a general practice, start with the caliper farthest from the master cylinder and work toward the closest one.
- Repeat the whole process at the rear caliper using the pedal, since the rear circuit is independent on this bike.
Finishing the Job
Once clean fluid is flowing at every bleeder, close each one snugly. Snug is the goal — firm enough to seal, not so tight that you crush the seat or strip the hex. Fill the reservoir to the level marking on the body, reinstall the diaphragm and cap, and wipe down every surface you touched. Then inspect the bleeder screws and the banjo fittings at the master cylinder and calipers for any weeping or dampness. A leak here will undo everything you just did.
Test Before You Ride
With the bike still on the stand, squeeze the lever and press the pedal. Both should feel firm and consistent, and neither should slowly sink while you hold steady pressure. Spin each wheel by hand and confirm the brakes are not dragging. Then, in a safe open area at low speed, apply the front and rear brakes separately and together before riding normally.
When to Stop and Call a Shop
If the lever will not firm up after several full bleeding cycles, if it only firms after pumping, if bubbles keep appearing no matter how long you bleed, or if you find fluid weeping from the master cylinder or a caliper, stop and have the bike inspected. There is also one ABS-specific situation worth knowing: if the reservoir ever ran dry, or if the ABS modulator or its lines were disconnected, air may have entered the ABS unit itself. A standard bleed at the calipers will not clear that, and the system may need a dealer-level procedure or diagnostic tool. In that case, take the H2 to a shop rather than continuing to pump fluid through it.
Related Shopping Categories
Shop Brake Fluid for a 2017 Kawasaki Ninja H2 Motorcycle.
Shop Brake Lines for a 2017 Kawasaki Ninja H2 Motorcycle.
Shop Brake Pads for a 2017 Kawasaki Ninja H2 Motorcycle.
Shop Stands for a 2017 Kawasaki Ninja H2 Motorcycle.
Shop Brake Tools for a 2017 Kawasaki Ninja H2 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.
