How to Bleed the Brakes on Your 2022 Honda Grom
Shop parts for a 2022 Honda Grom Motorcycle.
What Kind of Brake System the 2022 Grom Uses
Before you pick up a wrench, know what you are working on. The 2022 Grom stops with hydraulic disc brakes at both ends: a lever-mounted master cylinder feeding the front caliper, and a pedal-mounted master cylinder feeding a separate rear caliper. Both circuits use brake fluid, both can be bled in a home garage, and neither is a cable-operated drum that would need adjusting instead. Some 2022 Groms were sold with ABS. If yours has it, a normal bleed at the calipers is still the correct way to refresh fluid and push air out of the lines, but there is a limit to what hand pressure can do. If the reservoir has ever run dry, or the ABS unit or its lines have been disconnected, air can sit inside the modulator where a lever-pumping bleed will never reach it, and the bike needs a shop with the right diagnostic equipment.
Symptoms That Mean It Is Time to Bleed
The classic complaint is a front lever that feels squishy or pulls closer to the grip than it used to. A rear pedal with long, vague travel tells the same story at the other end. Dark or cloudy fluid behind the reservoir window is another reliable cue, and so is any recent work that opened the hydraulic system—new lines, caliper service, or master cylinder repairs—because air enters the moment the system is apart. Even with no symptoms at all, brake fluid gradually absorbs moisture from the air, which lowers its boiling point and makes fade more likely during hard or repeated braking. Plenty of riders simply flush on a set interval rather than waiting for the lever to go soft.
Tools and Supplies to Collect First
- Fresh brake fluid of the type printed on your Grom’s master cylinder reservoir cap, from a sealed container. Do not substitute a different fluid type.
- A box-end wrench that fits the bleeder valve snugly—test the fit before you start.
- Clear tubing that pushes onto the bleeder without leaking, long enough to reach a catch bottle.
- A clear catch bottle to see the old fluid and any bubbles coming through.
- Rags or shop towels, plus a syringe or turkey baster for emptying the reservoir.
- The correct driver for the reservoir cap screws.
A one-way check-valve bleeder or a vacuum bleeder makes the job easier when you are working alone, since you are not juggling the lever, the wrench, and the reservoir level at the same time.
Staging the Bike Before You Open Anything
Get the Grom upright and stable on a stand so it cannot tip while you are leaning over it. Turn the handlebar until the front reservoir sits level, because an angled reservoir spills as soon as the cap comes off. Brake fluid attacks paint and plastics, so drape rags over the tank area, the front cowl, the instrument cluster, and anything else below the reservoir. If a drop lands on a painted surface, wipe it up immediately and rinse the area with water rather than letting it sit.
The Bleeding Procedure, Front and Rear
- Open the reservoir and use the syringe or baster to lift out most of the old fluid. Leave enough at the bottom that you do not expose the port and pull air into the line.
- Top the reservoir with fresh fluid from the sealed container.
- Push the clear tubing onto the bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tube end stays submerged.
- Squeeze the lever and hold it steady against the grip. For the rear, press and hold the pedal.
- Open the bleeder about a quarter turn. Fluid and air will push out through the tube. Watch the tube, not the reservoir.
- Close the bleeder before you release the lever or pedal. Releasing first draws air back in through the open valve, which undoes the work.
- Release the lever or pedal slowly, then repeat the squeeze, hold, open, close, release cycle. Keep going until the fluid arriving in the tube is clean and free of bubbles.
- Check the reservoir after every few cycles and top it off. Letting it run low pulls air into the system and sends you back to the beginning.
- Move to the other circuit and repeat. On the Grom, the front and rear are independent systems, so each gets its own reservoir, bleeder, and bleed. If you are working on a bike with more than one caliper on a circuit, bleed the caliper farthest from the master cylinder first, then the closer one.
Finishing the Job Cleanly
Close the bleeder snugly—firm enough to seal, without cranking on it hard enough to damage the seat. Fill the reservoir to the level marking on the body, not past it, then reinstall the diaphragm and cap and wipe down the outside of the reservoir. Clean up any fluid that reached the tubing connections or the caliper, and inspect the bleeder and the banjo fittings for weeping before you call it done.
Testing Before You Ride
The lever and pedal should feel firm and consistent, not spongy, and should hold pressure without slowly sinking while you keep a steady squeeze on them. Spin each wheel by hand to confirm the brakes are not dragging. Then find a safe, empty area and test at low speed—a couple of gentle stops from walking pace—before riding normally. If anything feels vague or inconsistent at that point, stop and diagnose rather than assuming it will settle in.
Troubleshooting and When to Hand It Off
A lever that never firms up after several rounds of bleeding, a lever that only gets firm after repeated pumping, or a steady stream of bubbles that will not stop all point to air still entering somewhere, and the fix is finding the source rather than bleeding longer. Fluid weeping from the master cylinder or caliper means a seal needs attention. And if your Grom is ABS-equipped and you suspect air reached the ABS unit, or if you are not confident in your technique, hand the bike to a shop. Brakes are not the place to guess.
Related Shopping Categories
Shop Brake Fluid for a 2022 Honda Grom Motorcycle.
Shop Brake Lines for a 2022 Honda Grom Motorcycle.
Shop Brake Pads for a 2022 Honda Grom Motorcycle.
Shop Stands for a 2022 Honda Grom Motorcycle.
Shop Brake Tools for a 2022 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.
