Bleeding the Brakes on a 2024 Honda Grom
Shop parts for a 2024 Honda Grom Motorcycle.
The 2024 Honda Grom is a small bike with a serious brake system, and like any hydraulic setup it depends on clean, air-free fluid to deliver a firm, predictable lever and pedal. Bleeding the brakes is one of the most approachable jobs you can do in your own garage, and on a Grom it is made easier by how much of the hardware is right out in the open. This guide walks you through a full fluid flush and air removal on the 2024 Grom, from gathering supplies to the low-speed test that confirms the job is done right.
What the 2024 Grom's Brake Setup Looks Like
Your Grom uses hydraulic disc brakes at both ends: a single front disc fed by the lever-mounted master cylinder, and a single rear disc operated by the foot pedal through its own master cylinder and reservoir. That means both circuits are bled the same way, and both deserve attention when you service the system. Many 2024 Groms are also sold in an ABS-equipped version. If your bike has ABS, a routine bleed through the caliper bleeder valves is still the correct way to refresh fluid and clear air from the lines and calipers. What changes is the ABS modulator itself: if the reservoir ever ran dry, or if the ABS unit or its lines were disconnected, air can be trapped inside the modulator where a hand bleed will not reach it. In that case the bike needs a dealer-level procedure or diagnostic tool, and it should go to a shop rather than being pumped at home.
Signs It Is Time to Bleed
A spongy lever or a rear pedal that feels soft and vague is the classic symptom of air in the system. So is a front lever that now pulls noticeably closer to the grip than it used to, or one that slowly sinks toward the bar when you hold steady pressure at a stop. Dark, cloudy, or discolored fluid in either reservoir is another clear signal, and any job that opened the hydraulic circuit—new lines, caliper service, master cylinder work—requires a bleed afterward.
Even with no symptoms at all, brake fluid absorbs moisture from the air over time. That moisture lowers the fluid's boiling point, which can cause fade under hard or repeated braking, and it encourages corrosion inside the calipers and master cylinders. Refreshing the fluid on a regular schedule is cheap insurance on a bike that sees daily commuting or spirited weekend rides.
Tools and Supplies to Have Ready
- Fresh brake fluid of the type printed on your Grom's master cylinder reservoir cap, from a sealed container
- A box-end wrench that fits the bleeder valve snugly
- A length of clear tubing that fits tightly over the bleeder nipple
- A small catch bottle for the old fluid
- Rags or shop towels, plus a syringe or turkey baster for pulling old fluid out of the reservoir
- The correct driver for the reservoir cap screws
A one-way check-valve bleeder or a vacuum bleeder makes the job much easier when you are working alone, since you no longer have to coordinate the lever and the bleeder valve at the same moment.
Setting Up Before You Open Anything
Get the Grom secure and upright on a stand so it cannot tip while you are working the lever. Turn the handlebar so the front reservoir sits level, and check that the rear reservoir is level as well. Brake fluid attacks paint and many plastics on contact, so drape rags over the tank area, the instrument cluster, the front fender, and anything else below the reservoirs. If a drop does land on a painted surface, wipe it up immediately and rinse the area with water.
The Bleeding Procedure, Step by Step
- Open the reservoir cap and lift out the diaphragm. Use the syringe or baster to remove most of the old fluid, but leave enough in the bottom that the master cylinder port stays covered.
- Refill with fresh fluid from the sealed container, taking care not to splash.
- Push the clear tubing onto the bleeder valve and route the other end into the catch bottle with a little fluid already inside it.
- Squeeze and hold the front lever, or press and hold the rear pedal, and keep it held.
- Open the bleeder about a quarter turn. Fluid and air will push out through the tube.
- Close the bleeder before you release the lever or pedal. Releasing first pulls air back in through the valve.
- Repeat the squeeze, hold, open, close, release cycle until the fluid coming through the tube is clean and free of bubbles.
- Check the reservoir level after every few cycles and top it off. Never let it run low enough to draw air into the master cylinder.
- Move to the other circuit and repeat the whole process. As a general practice, start with the caliper farthest from its master cylinder and work toward the closest.
Finishing the Job Cleanly
When the fluid runs clear at both ends, tighten each bleeder snugly—firm enough to seal, without overtightening and risking damage to the valve or caliper. Fill each reservoir to the level marking, reinstall the diaphragm and cap, and wipe down every surface you touched. Then inspect the bleeder valves and the banjo fittings at the master cylinders and calipers for any sign of weeping or wetness.
Testing and Troubleshooting
Before you ride, the lever and pedal should feel firm and consistent, and neither should slowly sink under steady pressure. Spin each wheel by hand to confirm the brakes are not dragging. Then test at low speed in a safe, open area before riding normally.
If the lever will not firm up after several rounds of bleeding, if it only firms up when you pump it, if bubbles keep appearing, or if you find fluid leaking from a master cylinder or caliper, stop and diagnose rather than continuing to pump. And if your ABS-equipped Grom may have swallowed air into the modulator, that is a shop job. A firm, clean-feeling brake is the only acceptable result.
Related Shopping Categories
Shop Brake Fluid for a 2024 Honda Grom Motorcycle.
Shop Brake Lines for a 2024 Honda Grom Motorcycle.
Shop Brake Pads for a 2024 Honda Grom Motorcycle.
Shop Stands for a 2024 Honda Grom Motorcycle.
Shop Brake Tools for a 2024 Honda Grom 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.
