Bleeding the Brakes on a 2007 Kawasaki EX250 Ninja 250
Shop parts for a 2007 Kawasaki EX250 - Ninja 250 Motorcycle.Confirming the Brake Layout on This EX250
The 2007 Kawasaki EX250 Ninja 250 uses hydraulic disc brakes at both the front and rear wheels. That means the hand lever and the foot pedal each push brake fluid through a closed hydraulic circuit, and both circuits can benefit from a proper bleed. This model does not have ABS, and it does not use a linked or combined brake system, so the front and rear brakes are separate circuits. You will bleed the front through its caliper bleeder and the rear through its own caliper bleeder, one circuit at a time. Because the rear brake is hydraulic rather than a mechanical drum, it is bled rather than adjusted like a cable-operated brake.
When a Bleed Is Needed
A spongy or soft lever, a lever that pulls closer to the grip than it used to, or a rear pedal that feels vague are classic signs that air or old fluid is affecting the system. Dark or cloudy fluid in the reservoir is another reason to flush the brakes. A bleed is also required after any work that opened the hydraulic system, such as installing new brake lines, servicing a caliper, or replacing master cylinder components. Even without symptoms, brake fluid absorbs moisture over time, which lowers its boiling point and can lead to brake fade under hard use. Many riders refresh the fluid on a regular schedule for that reason alone.
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
- A length of clear tubing that fits snugly over the bleeder
- A catch bottle for the old fluid
- Rags or shop towels
- A syringe or turkey baster for removing old fluid from the reservoir
- A screwdriver 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 basic lever-and-bleeder method works fine with a little patience. Keep the fluid container capped when it is not in use, and do not reuse fluid that has been sitting open or drained from the system.
Preparation and Paint Protection
Support the bike securely upright on a stand so the reservoirs sit level. Turn the handlebars until the front reservoir is as level as possible 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. Work in a well-ventilated space, and keep the reservoir cap and diaphragm clean so dirt does not fall into the fluid.
Bleeding the Front and Rear Brakes
Complete one circuit before moving to the other. If a circuit ever has more than one caliper, the usual practice is to start with the caliper farthest from the master cylinder; on this EX250, each circuit has its own caliper, so you simply finish the front and then the rear, or the reverse.
- Open the reservoir for the circuit you are bleeding and use the syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
- Refill the reservoir with fresh fluid from the sealed container, leaving room for the diaphragm and cap.
- Attach the clear tubing to the bleeder valve and route the other end into the catch bottle. Make sure the tubing fits snugly so air is not pulled in around it.
- Squeeze and hold the front lever, or press and hold the rear pedal, to build pressure.
- Open the bleeder about a quarter turn with the box-end wrench. Fluid and air will flow out through the tubing.
- Close the bleeder before you release the lever or pedal. Releasing first can draw air back into the caliper.
- Repeat the squeeze-hold-open-close-release sequence until fresh, clean, bubble-free fluid comes through the tubing.
- Keep topping off the reservoir throughout the process so it never runs low enough to draw air into the master cylinder.
- When the front circuit is complete, tighten its bleeder snugly without overtightening, then repeat the same steps on the rear circuit using the rear pedal and rear reservoir.
Finishing, Leak Checks, and Test Ride
After both circuits are bled, fill each reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the bike. Check for leaks at the bleeder valves and at the banjo fittings where the brake lines attach. The lever and 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 and make sure they engage smoothly and release completely.
Troubleshooting and When to Stop
If the lever or pedal will not firm up after several bleeding attempts, or if it firms up only after pumping, stop and have the system inspected. Persistent air bubbles, fluid leaking from the master cylinder or caliper, or a lever that continues to feel soft are signs that the job is beyond a simple bleed. Because this EX250 has neither ABS nor linked brakes, you do not have to worry about an ABS unit or a combined-brake sequence, but a standard hydraulic circuit that will not bleed cleanly still deserves professional attention. It is better to diagnose the problem on a stand than to discover it during a ride.
Related Shopping Categories
Shop Brake Fluid for a 2007 Kawasaki EX250 - Ninja 250 Motorcycle.
Shop Brake Lines for a 2007 Kawasaki EX250 - Ninja 250 Motorcycle.
Shop Brake Pads for a 2007 Kawasaki EX250 - Ninja 250 Motorcycle.
Shop Stands for a 2007 Kawasaki EX250 - Ninja 250 Motorcycle.
Shop Brake Tools for a 2007 Kawasaki EX250 - Ninja 250 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.
