Bleeding the Brakes on a 2018 Ducati Hypermotard 939 SP
Shop parts for a 2018 Ducati Hypermotard 939 SP Motorcycle.The 2018 Ducati Hypermotard 939 SP uses hydraulic disc brakes at both ends and is equipped with ABS. That means the front lever and rear pedal each push fluid through a sealed hydraulic circuit, and a proper bleed is about replacing old fluid and removing air without introducing more. The ABS unit does not change the basic caliper-bleed procedure for routine fluid refresh, but it does raise the stakes if the reservoir runs dry or the system has been opened upstream. Work methodically, keep the reservoir from running empty, and stop if the lever or pedal will not firm up.
When a Bleed Is Due on This Hypermotard
A spongy or soft front lever is the classic sign that air is in the system, and a lever that pulls closer to the grip than it used to is another. On the rear, a pedal that feels vague or travels farther before it bites deserves the same attention. Dark or cloudy fluid in either reservoir is a clear indication that the fluid has aged, and any work that opened the hydraulic system—new lines, caliper service, or master cylinder work—should be followed by a bleed. Even without symptoms, brake fluid absorbs moisture over time, which lowers its boiling point and can lead to brake fade under hard use, so many riders refresh it on a regular schedule.
Tools and Supplies to Have Ready
- 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
- A length of clear tubing that fits snugly over the bleeder
- A catch bottle for the 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 manual lever-and-bleeder method works fine if you are patient. Have everything within reach before you open the reservoir, because once the cap is off you do not want to be searching for a towel or the correct wrench.
Preparing the Bike and Protecting Sensitive Surfaces
Support the 2018 Hypermotard 939 SP securely upright on a stand so it cannot tip while you are working the lever or pedal. Turn the handlebars so the front reservoir sits level before you open it, and make sure the rear reservoir is also in a position where it can be opened and topped off without spilling. Cover painted surfaces, plastics, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. If a spill does happen, wipe it up immediately and rinse the area with water.
Bleeding the Front and Rear Hydraulic Systems
As a general rule, begin with the caliper farthest from its master cylinder. On the front, if your bike has two front calipers, bleed one fully and then the other. The rear is a separate circuit, so treat it as its own job after the front is complete.
- Open the reservoir and use the syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
- Refill the reservoir with fresh fluid of the type marked on the cap, leaving room for the diaphragm and cap later.
- Attach the clear tubing to the bleeder valve and route the other end into the catch bottle.
- Squeeze and hold the front lever, or press and hold the rear pedal, and keep steady pressure on it.
- Open the bleeder about a quarter turn to let fluid and air escape through the tube.
- Close the bleeder before you release the lever or pedal. Releasing first can draw air back into the system.
- Repeat the squeeze-hold-open-close-release sequence until fresh, clean, bubble-free fluid comes through the tube.
- Keep topping off the reservoir throughout the job so it never runs low enough to draw air in.
- If your bike has two front calipers, repeat the process on the second caliper after the first is complete.
- Move to the rear circuit and repeat the same sequence with the rear pedal and rear caliper bleeder.
Finishing the Job and Testing Before You Ride
When clean fluid is coming through and no bubbles remain, tighten the bleeder snugly without overtightening. Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the caliper, reservoir, and surrounding surfaces. Check for leaks at the bleeder and at the banjo fittings before you put the tools away. The lever and 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, then test the brakes at low speed in a safe area before riding normally.
Troubleshooting and When to Stop
If the lever or pedal will not firm up after several bleeding attempts, or if it firms up only after pumping, air is still trapped somewhere. Persistent bubbles, fluid leaking from the master cylinder or caliper, or a lever that feels different every time you pull it are reasons to stop and investigate rather than keep riding. On this ABS-equipped Hypermotard, a standard bleed through the caliper bleeders is generally used to refresh fluid, but if air has entered the ABS unit itself—for example, if the reservoir ran dry or the ABS unit or its lines were disconnected—the system may require a dealer-level procedure or diagnostic tool. In that case, the bike should go to a shop. The same applies if you are ever working on a motorcycle with linked brakes, which have additional bleed points and a required sequence; leave that to a professional unless you are confident in the exact procedure.
Related Shopping Categories
Shop Brake Fluid for a 2018 Ducati Hypermotard 939 SP Motorcycle.
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Shop Brake Tools for a 2018 Ducati Hypermotard 939 SP 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.
