How To Bleed 2017 Ducati Hypermotard 939 Motorcycle Brakes

Bleeding the Brakes on a 2017 Ducati Hypermotard 939

The 2017 Ducati Hypermotard 939 uses hydraulic disc brakes at both ends, and it is equipped with ABS. That means the front lever and rear pedal each push fluid through a closed hydraulic circuit, and the ABS unit is part of that system. A normal bleed at the caliper bleeders is the right way to refresh fluid and remove air from the calipers and lines, but if the reservoir has run dry or the ABS unit or its lines have been opened, the job can move beyond a simple home bleed. This guide walks through a careful, methodical bleed for the Hypermotard 939 so you can restore a firm lever and pedal without guessing at specifications.

When a Bleed Is Needed on the Hypermotard 939

Brake fluid absorbs moisture over time, even in a sealed system. That moisture lowers the fluid’s boiling point and can contribute to fade when the brakes are worked hard, so many riders refresh the fluid on a regular schedule even when the brakes still feel acceptable. On a street bike like the Hypermotard 939, the more immediate clues are a lever that feels spongy or soft, a lever that pulls closer to the grip than it used to, a pedal with a long or vague feel, or fluid in the reservoir that looks dark or cloudy. A bleed is also required after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work.

Tools and Supplies to Stage Before Starting

Gather everything before you open the reservoir so you are not searching for a tool with the system exposed. Use fresh brake fluid of the type marked on the master cylinder reservoir cap, and use fluid from a sealed container. Do not substitute a different fluid type based on guesswork.

• Fresh brake fluid of the type marked on the 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 catch bottle for old fluid
• Rags or shop towels
• A syringe or turkey baster for removing old fluid from the reservoir
• A screwdriver or driver that fits the reservoir cap screws

A one-way check-valve bleeder or a vacuum bleeder can make the job easier when you are working alone, but the basic lever-and-bleeder method works if you are patient and keep the reservoir topped off.

Preparing the Bike and Protecting Surfaces

Support the Hypermotard 939 securely upright on a stand. Turn the handlebars so the front reservoir sits level before you remove the cap. Cover painted surfaces, plastic bodywork, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. If fluid spills, wipe it up immediately and rinse the area with water. Keep the reservoir cap and diaphragm clean and set them where they will not pick up grit.

Bleeding the Front Brake

Work through the front system first, then move to the rear. If your bike is fitted with two front calipers, treat each caliper as its own bleed point and bleed one at a time. As a general practice, start with the caliper farthest from the master cylinder, then bleed the other side.

1. Open the front reservoir and use the syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
2. Refill the reservoir with fresh fluid of the type marked on the cap.
3. Fit the clear tubing snugly over the front caliper bleeder valve and route the other end into the catch bottle.
4. Squeeze and hold the front lever.
5. Open the bleeder about a quarter turn to let fluid and air escape through the tube.
6. Close the bleeder before you release the lever. Releasing the lever with the bleeder open can draw air back into the system.
7. Repeat the squeeze-hold-open-close-release sequence until fresh, clean, bubble-free fluid comes through the tube.
8. Keep topping off the reservoir throughout the process so it never runs low enough to draw air in.
9. If there is a second front caliper, repeat the same sequence on that caliper.

Bleeding the Rear Brake

The rear brake on the Hypermotard 939 is also hydraulic, so it gets the same treatment at the rear caliper bleeder. Keep the rear reservoir topped off and use the same tube-and-catch-bottle setup. Press and hold the rear pedal, open the bleeder about a quarter turn, close it before releasing the pedal, and repeat until the fluid runs clean and free of bubbles. Check the reservoir level often; the rear reservoir is small and can run low quickly during a flush.

Finishing Up and Checking for Leaks

When clean fluid is coming through at both ends, tighten each bleeder snugly without overtightening. Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the calipers, lines, and bodywork. Check for leaks at the bleeder valves and at the banjo fittings. A weep at either point means you should stop and correct it before riding.

Testing Before You Ride

The front lever and rear pedal should feel firm and consistent, not spongy, and they should not slowly sink under steady pressure. Spin each wheel to confirm the brakes are not dragging. Test the brakes at low speed in a safe area before riding normally. If the lever or pedal still feels soft, or if it firms up only after several pumps, there is likely still air in the system.

Troubleshooting and When to See a Shop

A lever that will not firm up after several bleeding attempts, persistent air bubbles, fluid leaking from the master cylinder or caliper, or a brake that drags are all reasons to stop and diagnose rather than keep pumping fluid through. Because the 2017 Hypermotard 939 has ABS, any situation where air may have entered the ABS unit itself—such as a reservoir that ran dry or ABS lines that were disconnected—may require a dealer-level procedure or diagnostic tool. Do not attempt to guess at an ABS bleed sequence. If you are not confident the air is out of the system, have the bike inspected by a qualified shop before riding.

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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.