How to Bleed the Brakes on Your 2018 Honda CB1000R
Shop parts for a 2018 Honda CB1000R Motorcycle.Why the CB1000R Needs a Brake Bleed
The 2018 Honda CB1000R uses hydraulic disc brakes at both ends and is ABS-equipped. That gives you a front hydraulic circuit and a rear hydraulic circuit, each with its own master cylinder, caliper, and bleeder. A normal caliper bleed is the right way to refresh fluid and remove air from those circuits. If air has entered the ABS unit itself—for example, because the reservoir ran dry or the ABS unit or its lines were disconnected—the bike may need a dealer-level procedure or diagnostic tool, so plan to have a shop handle that situation.
Bleeding is due when the lever or pedal feels spongy, the lever pulls closer to the grip than it used to, the fluid in the reservoir looks dark or cloudy, or you have opened the hydraulic system for new lines, caliper service, or master cylinder work. Brake fluid absorbs moisture over time, which lowers its boiling point and can contribute to fade under hard use. Many riders refresh it on a regular schedule even when the brakes still feel normal.
Tools and Supplies for the Job
- 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
- A catch bottle for old 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 the manual lever-and-bleeder method works fine with a little patience.
Setting Up the Bike and Protecting It
Support the CB1000R securely upright on a stand so it cannot tip while you are working. Turn the handlebars so the front reservoir sits level 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 fluid spills, wipe it up immediately and rinse the area with water.
Open the reservoir and remove most of the old fluid with a syringe or turkey baster. Do not let the reservoir run dry. Refill it with fresh fluid from the sealed container, leaving room for the diaphragm and cap to go back on later. Keep the cap nearby and covered so dust does not settle into the fluid.
Bleeding the Front and Rear Hydraulic Systems
Work through one circuit at a time. The front and rear are separate hydraulic systems on this bike, so bleed the front, then the rear, or the reverse. Within a circuit, start with the caliper farthest from the master cylinder if there is more than one bleed point. If your bike has two front calipers, treat them as separate bleed points and do one at a time.
- Attach the clear tubing to the bleeder valve and route the other end into the catch bottle. The tubing should fit snugly so air cannot leak in around it.
- For the front, squeeze and hold the lever. For the rear, press and hold the pedal. Keep steady pressure on it.
- Open the bleeder about a quarter turn with the box-end wrench. Fluid and air will flow out through the tube.
- Close the bleeder before you release the lever or pedal. This is the critical step: releasing with the bleeder open can draw air back into the system.
- Release the lever or pedal, then repeat the squeeze-hold-open-close-release cycle. Watch the tubing for bubbles and for the color of the fluid.
- Keep topping off the reservoir throughout the process. Never let it run low enough to draw air in. If it does run dry, stop and expect to bleed more thoroughly, and have the ABS system checked if the bike is ABS-equipped.
- Continue until fresh, clean, bubble-free fluid comes through the tube. Then close the bleeder snugly without overtightening it.
- Move to the other front caliper if your bike has two, then repeat the process at the rear caliper using the pedal.
Finishing the Bleed and Checking for Leaks
Once both circuits are bled, fill the reservoir to the correct level marking. Reinstall the diaphragm and cap. Clean any spilled fluid from the calipers, master cylinders, and surrounding parts, and rinse with water if fluid reached painted or plastic surfaces. Check for leaks at the bleeder valves and at the banjo fittings. A weep at a bleeder usually means it is not snug; a weep at a banjo fitting means that connection needs attention before the bike is ridden.
Do not overtighten the bleeder in an attempt to stop a leak. It needs to be snug, not crushed. If tightening does not stop a leak, stop and have the caliper or bleeder inspected.
Test Ride and Troubleshooting
Before riding, 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. Test the brakes at low speed in a safe area before riding normally.
If the lever 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 diagnose the problem. Air that has entered an ABS unit, a reservoir that ran dry, or a system that has been opened at the ABS unit or its lines is a job for a shop with the right procedure and tools. A brake system that will not hold pressure is not safe to ride.
Related Shopping Categories
Shop Brake Fluid for a 2018 Honda CB1000R Motorcycle.
Shop Brake Lines for a 2018 Honda CB1000R Motorcycle.
Shop Brake Pads for a 2018 Honda CB1000R Motorcycle.
Shop Stands for a 2018 Honda CB1000R Motorcycle.
Shop Brake Tools for a 2018 Honda CB1000R 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.
