How To Bleed 2013 Honda CB1100 ABS Motorcycle Brakes

How to Bleed the Brakes on a 2013 Honda CB1100 ABS

Know the System Before You Open It

The 2013 Honda CB1100 ABS uses hydraulic disc brakes at both ends. The front brake is operated by the lever on the right handlebar and works the front caliper or calipers, while the rear brake is operated by the foot pedal and works the rear caliper. Because this model carries the ABS designation, an anti-lock modulator sits in the hydraulic circuit between the master cylinders and the calipers.

That last detail matters. A routine bleed performed at the caliper bleeder valves is the normal way to refresh fluid and push out air that has collected near the calipers or in the lines. What a home bleed will not reliably do is purge air that has traveled into the ABS unit itself. If the reservoir ever ran dry, if a line or the modulator was disconnected, or if the system was opened for service, the modulator may need a dealer-level procedure or a diagnostic tool to cycle its internal valves. Plan on a shop visit in those cases rather than chasing a soft lever for an afternoon.

When a Bleed Is Actually Due

Riders usually reach for the bleeder because something changed at the controls. A lever that feels spongy or mushy, a lever that now comes noticeably closer to the grip before the brakes bite, or a pedal with a long, soft travel are all classic signs of air in the system. Dark, cloudy, or contaminated fluid visible through the reservoir sight glass or under the cap is another prompt.

Any job that opened the hydraulics also earns a bleed afterward — new brake lines, a caliper rebuild or replacement, master cylinder work, or a fluid flush. Beyond symptoms, brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. Moisture lowers the fluid's boiling point, and a boiling fluid creates vapor that behaves like air in the line, which shows up as fade or a long lever during hard, repeated braking. That is why many riders refresh the fluid on a regular interval even when the brakes still feel fine.

Tools and Supplies to Assemble

• Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container. Do not substitute a different type.
• A box-end wrench that fits the bleeder valve snugly. A box-end grips the flats far better than an open-end and is less likely to round the bleeder.
• A length of clear tubing that fits tightly over the bleeder nipple, plus a 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 helpful: a one-way check-valve bleeder or a vacuum bleeder, either of which makes a solo job much less fiddly.

Setting Up Without Damaging the Bike

Get the CB1100 standing securely upright on a paddock stand or center stand so the reservoirs sit level. For the front, turn the handlebars until the reservoir on the master cylinder is as flat as it can be before you remove the cap. Lay rags over the tank, the side panels, the instrument cluster, and anything else below the reservoir and bleeder, because brake fluid attacks paint and many plastics on contact. If a drop lands where it shouldn't, wipe it up immediately and rinse the area with water rather than letting it sit.

The Bleeding Procedure, Step by Step

1. Wipe the reservoir cap and surrounding area clean so no grit falls in, then remove the cap and diaphragm.
2. Use the syringe or baster to draw most of the old fluid out of the reservoir. Leave enough at the bottom that you are not pulling air into the master cylinder port.
3. Top the reservoir up with fresh fluid from the sealed container.
4. Push the clear tubing onto the bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tube's end stays submerged.
5. If your bike has two front calipers, work on one at a time and finish it before moving to the other. As a general practice, start with the caliper farthest from the master cylinder in hydraulic terms.
6. Squeeze the front lever and hold it, or press and hold the rear pedal. Keep steady pressure on it.
7. Open the bleeder about a quarter turn with the box-end wrench. Fluid and any trapped air will push out through the tube. Watch the tube, not the reservoir, while the bleeder is open.
8. Close the bleeder before you release the lever or pedal. Releasing with the bleeder open draws air straight back into the caliper.
9. Release the lever or pedal slowly and let it return fully.
10. Check the reservoir level and top it off. Repeat the squeeze, hold, open, close, release cycle until the fluid coming through the tube runs clean and free of bubbles.
11. Keep topping the reservoir off throughout. If it runs low enough to draw air at the master cylinder, you have just added the problem you were trying to remove.
12. Move to the rear caliper if the rear brake needs attention and repeat the same sequence with the pedal.

Closing Out the Job

When the fluid runs clean at every bleeder, tighten each bleeder snugly with the box-end wrench. Snug is the goal — do not lean on it, because overtightening can damage the seat and cause a weep. Fill the 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 cylinder and calipers for any sign of weeping or wetness.

Verifying the Result Before You Ride

Pull the lever and press the pedal. Both should feel firm and consistent, and neither should slowly sink while you hold steady pressure on it. Spin each wheel by hand to confirm the brakes are not dragging. Then, in a safe open area, test the brakes at low speed before riding normally. If the lever still feels soft, or if it only firms up after several pumps, there is still air in the system.

When to Hand It to a Shop

Stop and book service if the lever will not firm up after several honest bleeding attempts, if bubbles keep appearing no matter how long you bleed, if fluid is leaking from the master cylinder or a caliper, or if you suspect air reached the ABS modulator. A lever that firms only when pumped, or a pedal that fades under sustained pressure, points to a problem a bleed alone will not solve. On an ABS-equipped bike like the CB1100, that is the point where a diagnostic tool and a trained hand are worth far more than another quart of fluid.

Related Shopping Categories

Shop Brake Fluid for a 2013 Honda CB1100 ABS Motorcycle.

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Shop Brake Pads for a 2013 Honda CB1100 ABS Motorcycle.

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Shop Brake Tools for a 2013 Honda CB1100 ABS 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.