Bleeding the Brakes on a 2020 Honda CBR600RR

Shop parts for a 2020 Honda CBR600RR Motorcycle.

The 2020 Honda CBR600RR is a hydraulic-disc-brake motorcycle at both ends, so both the front lever and the rear pedal act on fluid-filled systems that can collect air and moisture over time. Some 2020 CBR600RR models are equipped with ABS, and some are not; check your own bike before you start. On a non-ABS bike, bleeding is a straightforward caliper-and-master-cylinder job. On an ABS bike, a normal bleed at the caliper bleeders is generally used to refresh fluid, but if the reservoir has run dry or the ABS unit or its lines have been opened, air may be trapped where a home bleed cannot reach it. That situation belongs at a shop with the appropriate diagnostic equipment.

When a Bleed Is Due

A spongy lever, a pedal that feels softer than it used to, or a lever that pulls closer to the grip are classic signs that air or old fluid is affecting the system. Dark or cloudy fluid in the reservoir is another clue. Brake fluid absorbs moisture from the air over time, which lowers its boiling point and can contribute to brake fade under hard use, so many riders refresh the fluid on a regular schedule even when the brakes still feel normal. A bleed is also due after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work.

Tools and Supplies to Gather

  • 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 small catch bottle for used fluid
  • Rags or shop towels, plus 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 a vacuum bleeder, which can make a one-person job easier

Set Up Safely Before Opening Anything

Support the 2020 CBR600RR securely upright on a stand so it cannot tip while you are working at the lever and calipers. Turn the handlebars so the front reservoir sits level before you remove the cap. 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. Keep the reservoir cap and diaphragm clean and set them where they will not pick up grit.

Bleeding the Front Brake

  1. Remove the front reservoir cap and diaphragm. Use the syringe or turkey baster to remove most of the old fluid from the reservoir, but do not let the reservoir run dry.
  2. Refill the reservoir with fresh fluid of the type marked on the cap, leaving room for the diaphragm.
  3. Fit the clear tubing over the front caliper bleeder valve and route the other end into the catch bottle.
  4. If your bike has two front calipers, bleed each one in turn. As a general practice, start with the caliper farthest from the master cylinder.
  5. Squeeze and hold the front lever. Open the bleeder about a quarter turn and let fluid and air escape through the tube. Close the bleeder before you release the lever.
  6. Repeat the squeeze, hold, open, close, and release sequence until fresh, clean, bubble-free fluid comes through the tube. Keep topping off the reservoir throughout so it never runs low enough to draw air in.
  7. When the fluid runs clear and no bubbles appear, close the bleeder snugly without overtightening it. Refit the diaphragm and cap.

Bleeding the Rear Brake

  1. Open the rear master cylinder reservoir and remove most of the old fluid with the syringe or baster, again without letting the reservoir run dry.
  2. Refill with fresh fluid of the type marked on the reservoir cap.
  3. Attach the clear tubing to 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, let fluid and air out, then close the bleeder before releasing the pedal.
  5. Repeat until the fluid in the tube is clean and free of bubbles, topping off the rear reservoir as you go.
  6. Close the rear bleeder snugly without overtightening, then refit the reservoir diaphragm and cap.

Finishing and Checking Your Work

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. 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. Before riding normally, test the brakes at low speed in a safe area.

If the Brakes Will Not Firm Up

A lever or pedal that will not firm up after several bleeding attempts, one that firms up only after pumping, persistent air bubbles, or fluid leaking from the master cylinder or caliper are reasons to stop and diagnose further. On an ABS-equipped 2020 CBR600RR, any situation where air may have entered the ABS unit is best handled by a shop. If you are not confident in the result, do not ride the bike until a qualified technician has checked the system.

Related Shopping Categories

Shop Brake Fluid for a 2020 Honda CBR600RR Motorcycle.

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Shop Brake Pads for a 2020 Honda CBR600RR Motorcycle.

Shop Stands for a 2020 Honda CBR600RR Motorcycle.

Shop Brake Tools for a 2020 Honda CBR600RR 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.