How to Bleed the Brakes on Your 2022 Honda Grom ABS

Shop parts for a 2022 Honda Grom ABS Motorcycle.

The 2022 Honda Grom ABS has hydraulic disc brakes at both ends, and the ABS trim adds an anti-lock module to the hydraulic system. The front lever and rear pedal work separate circuits, so bleed each one individually. A standard caliper bleed is the right approach for refreshing fluid or removing air that entered at a caliper or line. The ABS unit only changes the plan if air has entered the module itself, which is a shop-level concern. This guide walks you through the job safely and helps you decide when to stop.

Why and When the Grom ABS Needs a Brake Bleed

Brake fluid absorbs moisture from the air over time. That moisture lowers its boiling point and can cause brake fade under hard or repeated use, even if the bike feels fine on a short ride. A spongy front lever, a vague rear pedal, a lever that pulls closer to the grip, or dark, cloudy fluid in the reservoir are signs that fresh fluid and a bleed are due. Bleed the brakes after any work that opened the hydraulic system, such as new lines, caliper service, or master cylinder work. Many riders also refresh fluid on a regular schedule as preventive maintenance.

Tools and Supplies for the Job

  • 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 clean catch bottle for used fluid
  • Rags or shop towels, plus a syringe or turkey baster for removing old fluid from the reservoir
  • A screwdriver or driver that fits the reservoir cap screws
  • Optional: a one-way check-valve bleeder or vacuum bleeder to make one-person bleeding easier

Use only fresh fluid from a sealed container. Fluid that has been open for a while may already have absorbed moisture, which defeats the flush. Keep used fluid away from painted surfaces.

Preparation Before You Open the System

Support the 2022 Grom ABS securely upright on a stand so it cannot tip while you work the lever and pedal. Turn the handlebars so the front reservoir sits level before removing the cap. Cover painted bodywork, plastics, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. Wipe up spills immediately and rinse the area with water. Set out tools and tubing before opening the reservoir. Work on one circuit at a time and keep the other reservoir capped.

Step-by-Step Bleeding Procedure

  1. Clean the reservoir top, then remove the cap and diaphragm. Use a syringe or turkey baster to remove most old fluid without letting the level drop low enough to draw air into the master cylinder.
  2. Refill with fresh fluid of the type marked on the cap. Leave the cap off for now, but keep the reservoir upright and protected.
  3. Attach clear tubing to the caliper bleeder and route the other end into the catch bottle. Position the box-end wrench on the bleeder so you can open and close it smoothly.
  4. For the front, squeeze the lever slowly and hold it. For the rear, press and hold the pedal. Keep steady pressure while you open the bleeder.
  5. Open the bleeder about a quarter turn and let fluid and air escape. Watch the tube for bubbles and dirty fluid.
  6. Close the bleeder before releasing the lever or pedal. Releasing first can pull air back into the caliper.
  7. Release slowly, then check the reservoir level and top it off. Never let the reservoir run dry during the bleed.
  8. Repeat the squeeze-hold-open-close-release sequence until the fluid is clean and bubble-free. Top off the reservoir after every few cycles.
  9. Move to the other circuit and repeat with its lever or pedal and caliper bleeder. Treat front and rear as separate jobs. If a circuit has more than one caliper, bleed them one at a time, starting with the caliper farthest from the master cylinder.
  10. When clean, bubble-free fluid comes through and the lever or pedal feels firm, close the bleeder snugly. Do not overtighten; snug seals without damaging the valve.

Finishing the Bleed

Fill the reservoir to the correct level marking with fresh fluid, then reinstall the diaphragm and cap. Wipe up any spilled fluid immediately and rinse the area with water if fluid touched paint or plastic. Check the bleeder valve and the banjo fittings at the master cylinder and caliper for leaks. A dry shop towel wrapped around each fitting after a few lever or pedal strokes will show any seepage. If you see fluid, stop and correct the leak before riding.

Testing the Grom ABS Brakes Before You Ride

The front lever and rear pedal should feel firm and consistent, not spongy, and they should not slowly sink while you hold steady pressure. Spin each wheel to confirm the brakes are not dragging. With the bike upright and in a safe area, test the brakes at low speed before riding normally. Make a few gentle stops and confirm the lever and pedal feel the same each time. If anything changes or feels soft, do not ride the bike until the problem is resolved.

Troubleshooting and When to See a Shop

If the lever or pedal will not firm up after several attempts, firms only after pumping, or keeps producing air bubbles, stop and look for a source of air. Persistent bubbles can mean a loose bleeder, a sealing fitting, or a master cylinder problem. Fluid leaking from the master cylinder or caliper also needs attention before riding. On the 2022 Grom ABS, if the reservoir ran dry, or if the ABS unit or its lines were disconnected, air may have entered the ABS module. A standard caliper bleed may not remove it, so take the bike to a shop with proper diagnostic equipment. If you are not confident in your results, stop: brakes are safety-critical, and a professional inspection is cheaper than a failed brake system.

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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.