Bleeding the Brakes on a 2018 Honda CBR1000RR

Shop parts for a 2018 Honda CBR1000RR Motorcycle.

The 2018 Honda CBR1000RR uses hydraulic disc brakes at both ends, so the front lever and the rear pedal each operate a fluid-filled circuit. This is not a linked-brake design; the front and rear systems are bled separately. If your CBR1000RR is the ABS-equipped version, a normal bleed at the calipers is still the correct way to refresh fluid, but air trapped inside the ABS unit is a different matter and should be handled by a shop. The procedure below covers a full fluid flush and air removal for a DIY rider with basic hand tools and moderate mechanical confidence.

When the CBR1000RR Needs a Brake Bleed

A spongy or soft lever, a lever that now pulls closer to the grip than it used to, or a rear pedal that feels vague are all signs that air or old fluid is affecting the system. Dark or cloudy fluid in the reservoir is another clear indicator. You should also bleed the brakes after any work that opened the hydraulic system, such as installing new brake lines, servicing a caliper, or replacing master cylinder components.

Brake fluid absorbs moisture over time, which lowers its boiling point. That can lead to brake fade under hard or repeated use, even if the lever still feels acceptable during easy riding. Many riders refresh the fluid on a regular schedule as preventive maintenance rather than waiting for a problem to appear. On a CBR1000RR, which is capable of serious speed, fresh fluid and a firm lever are worth the effort.

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
  • Optional: a one-way check-valve bleeder or vacuum bleeder to make the job easier for one person

Preparing the Bike and Work Area

Support the CBR1000RR securely upright on a stand so it cannot tip while you are working. For the front brake, turn the handlebars so the front reservoir sits level before you open it. For the rear, keep the bike upright and make sure the rear reservoir is level as well.

Cover painted surfaces, plastics, and the instrument area with rags before opening any reservoir. Most brake fluids damage paint and plastic on contact. If a spill happens, wipe it up immediately and rinse the area with water. Do not let fluid sit on finished surfaces while you finish the job.

Bleeding the Front Brake Circuit

  1. Open the front master cylinder reservoir and use a syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
  2. Refill the reservoir with fresh fluid from a sealed container, using the fluid type marked on the reservoir cap.
  3. Attach the clear tubing to the front caliper bleeder valve and route the other end into the catch bottle.
  4. Squeeze and hold the front lever. Open the bleeder about a quarter turn to let fluid and air escape.
  5. Close the bleeder before releasing the lever. Releasing the lever with the bleeder open can draw air back into the system.
  6. Repeat the squeeze, hold, open, close, and release sequence until fresh, clean, bubble-free fluid comes through the tube.
  7. Keep topping off the reservoir throughout the process so it never runs low enough to draw air in.
  8. If your bike has more than one front caliper, bleed each one in turn. As a general practice, start with the caliper farthest from the master cylinder by hose routing, then move to the other.

Bleeding the Rear Brake Circuit

  1. Open the rear reservoir and remove most of the old fluid without letting the reservoir run dry.
  2. Refill with fresh fluid of the type marked on the reservoir cap.
  3. Fit the clear tubing over the rear caliper bleeder valve and route it into the catch bottle.
  4. Press and hold the rear pedal. Open the bleeder about a quarter turn to release fluid and air.
  5. Close the bleeder before releasing the pedal.
  6. Repeat until the fluid in the tube is clean and free of bubbles, topping off the reservoir as needed.

Finishing the Job Correctly

When the fluid runs clean at both ends, tighten each bleeder snugly without overtightening. Fill the 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. A small weep at a bleeder is a sign it is not seated properly; a leak at a banjo fitting means that connection needs attention before the bike is ridden.

Testing and Troubleshooting Before You Ride

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 will not firm up after several bleeding attempts, if it firms up only after pumping, if bubbles keep appearing, or if fluid leaks from the master cylinder or caliper, stop and diagnose the problem. Air that has entered an ABS unit, or any situation where the ABS unit or its lines were disconnected, is beyond a typical home bleed and should go to a shop. A CBR1000RR brake system that will not hold a firm lever is not safe to ride until the cause is corrected.

Related Shopping Categories

Shop Brake Fluid for a 2018 Honda CBR1000RR Motorcycle.

Shop Brake Lines for a 2018 Honda CBR1000RR Motorcycle.

Shop Brake Pads for a 2018 Honda CBR1000RR Motorcycle.

Shop Stands for a 2018 Honda CBR1000RR Motorcycle.

Shop Brake Tools for a 2018 Honda CBR1000RR 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.