Bleeding the Brakes on a 2017 Honda CBR500R
Shop parts for a 2017 Honda CBR500R Motorcycle.
The 2017 Honda CBR500R stops on hydraulic disc brakes at both ends. The front brake is fed by a master cylinder on the right handlebar with a reservoir built into it, and the rear brake has its own master cylinder and small reservoir down by the right footpeg. Each circuit is sealed and independent, which is good news for a home mechanic: you can bleed one end at a time, and a mistake on one side does not contaminate the other. Some 2017 CBR500R models left the factory with ABS and some did not, so take a minute to look at your own bike before you touch anything. An ABS-equipped bike will have a toothed ring and a wheel speed sensor at each wheel and an ABS indicator on the dash. That distinction matters later in this job, and it is worth knowing which bike is in your garage before the first drop of fluid leaves the reservoir.
Know Your Bike's Brake Layout First
Before you gather tools, walk around the CBR500R and confirm what you are working on. Up front, the lever on the right bar pushes a piston in the master cylinder, and the reservoir cap on top of it is where the fluid type is printed. Follow the line down to the caliper and find the bleeder valve — a small hex-headed fitting with a rubber cap on it. If your particular bike carries two front calipers, you will find a bleeder on each and you will bleed them one at a time. At the rear, the pedal actuates a master cylinder mounted near the footpeg, and the rear caliper has its own bleeder. The CBR500R does not use a linked or combined braking system, so the front lever works the front brake only and the pedal works the rear only. That keeps the procedure straightforward.
Why and When to Bleed the Brakes
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, because it is. On a bike like the CBR500R, which is happy to be ridden briskly, that is a real safety concern rather than a cosmetic one. Many riders simply refresh the fluid on a regular interval as preventive maintenance, and that is a reasonable habit even if the brakes feel fine.
Bleed immediately if the lever or pedal feels spongy or soft, if the lever now comes noticeably closer to the grip than it used to, if the fluid in either reservoir looks dark or cloudy, or if you have just had the hydraulic system open for any reason — new lines, caliper service, or master cylinder work. Any of those situations can introduce air, and air compresses where fluid does not.
Tools and Supplies to Collect
- Fresh brake fluid of the type marked on your bike's reservoir cap, from a sealed container. Do not substitute a different type and do not use a bottle that has been open and sitting on a shelf.
- A box-end wrench that fits the bleeder valve snugly. A box-end grips the flats properly and is far less likely to round the fitting than an open-end.
- 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 one-person job much less fiddly.
Setting Up Without Damaging the Bike
Get the CBR500R supported securely upright on a stand so it cannot tip while you are working and so the reservoirs sit at a sensible angle. For the front, turn the handlebars until the reservoir on the bar is level; a reservoir that is tilted will spill as soon as the cap comes off. Drape rags over the tank, the fairing panels, the dash, and anything else below the work area. Brake fluid attacks paint and many plastics on contact, so treat every drip as urgent: wipe it up immediately and rinse the area with water if any lands on a painted or plastic surface. Keep the cap on the reservoir until you are actually ready to open it.
The Bleeding Procedure, Step by Step
- Start with the reservoir you intend to work on. Wipe the cap and the area around it clean so grit cannot fall in, then remove the cap and the diaphragm beneath it.
- Use the syringe or baster to draw most of the old fluid out of the reservoir. Leave enough that the bottom of the reservoir never runs dry, and set the old fluid aside in a sealed container for disposal.
- Top the reservoir up with fresh fluid from your sealed bottle.
- Press the clear tubing onto the bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tubing runs upward or level rather than straight down where possible — it helps you see bubbles.
- If your bike has two front calipers, decide which one to do first. A common approach is to begin with the caliper farthest from the master cylinder in terms of line length, then move to the closer one.
- Squeeze the front lever, or press the rear pedal, and hold it steady under pressure. Do not release it yet.
- With pressure held, crack the bleeder about a quarter turn. Fluid and any trapped air will push out through the tubing. Watch the tube, not your hands.
- Close the bleeder before you release the lever or pedal. This order is the whole trick — releasing first lets air get sucked back past the threads and 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 drop low enough to draw air in at the master cylinder.
- Continue until the fluid coming through the tubing is clean and free of bubbles, and the lever or pedal feels firm. Then move to the other caliper if you have one, and repeat the whole process on the rear brake if you are refreshing both circuits.
Finishing Up Correctly
When you are satisfied, close the bleeder snugly — firm, but not so tight that you deform the fitting or strip it. Pull the tubing off and refit the rubber cap. 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 and the banjo fittings at the caliper and master cylinder for any sign of weeping. A dry fitting after a few minutes of sitting is what you want to see.
Testing Before You Ride
With the bike still supported, spin each wheel by hand and confirm the brakes are not dragging. Then check feel: the lever and pedal should be firm and consistent, and should hold pressure without slowly sinking toward the grip or the floor. If either one creeps, there is still air or a leak, and the bike is not ready. Take it to a quiet, safe area and test the brakes at low speed before riding normally.
When This Job Belongs in a Shop
If your CBR500R is an ABS model and the reservoir ever ran dry, or the ABS unit or its lines were disconnected, air may have entered the ABS modulator itself. A standard bleed at the caliper will not necessarily clear that, and the system may need a dealer-level procedure or diagnostic tool. The same advice applies if the lever refuses to firm up after several honest attempts, if it only firms up when you pump it, if bubbles keep appearing no matter how long you bleed, or if you find fluid leaking from the master cylinder or a caliper. Those are signs to stop, clean up, and hand the bike to a professional rather than keep chasing the problem.
Related Shopping Categories
Shop Brake Fluid for a 2017 Honda CBR500R Motorcycle.
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Shop Brake Pads for a 2017 Honda CBR500R Motorcycle.
Shop Stands for a 2017 Honda CBR500R Motorcycle.
Shop Brake Tools for a 2017 Honda CBR500R 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.
