How To Bleed 2017 Ducati Hypermotard 939 SP Motorcycle Brakes

Bleeding the Brakes on Your 2017 Ducati Hypermotard 939 SP

Know Your Hypermotard's Brake Layout

The 2017 Ducati Hypermotard 939 SP uses hydraulic disc brakes at both ends—dual discs up front and a single disc at the rear—and it comes with ABS as part of its electronics package. That means you can bleed both the front and rear systems at home using the caliper bleeder valves, but you need to respect the ABS unit. A standard bleed that pushes fresh fluid through the calipers is fine for routine maintenance. However, if the reservoir has run dry or you've had the ABS unit or its lines disconnected, air may be trapped inside the ABS hardware. That situation calls for a dealer-level procedure or diagnostic tool, so plan to take the bike to a shop rather than trying to force it in your garage.

Why and When to Bleed the Brakes

Brake fluid is hygroscopic, meaning it absorbs moisture from the air over time. That moisture lowers the fluid's boiling point, which can cause brake fade under hard or repeated use—exactly the kind of riding a Hypermotard encourages. Even if the lever feels fine, many riders refresh the fluid on a regular schedule as preventive maintenance. You should also bleed the system whenever you notice a spongy or soft lever or pedal, a lever that pulls closer to the grip than it used to, or dark, cloudy fluid in the reservoir. Any work that opened the hydraulic system—new brake lines, caliper service, or master cylinder work—also demands a bleed afterward to remove introduced air.

Tools and Supplies You'll Need

• 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 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 working alone, but the manual method works fine with a helper.

Preparing the Bike and Workspace

Support the Hypermotard securely upright on a stand so it won't tip while you work. For the front brake, turn the handlebars until the front reservoir sits level—this keeps fluid from spilling when you open the cap. Cover the painted surfaces, plastic bodywork, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. If a spill happens, wipe it up immediately and rinse the area with water. Work in a well-ventilated space and keep the fluid container capped when not in use.

Step-by-Step Bleeding Procedure

This procedure covers both the front and rear brakes. Work on one system at a time, starting with the front. The general practice is to begin with the caliper farthest from the master cylinder, but on a dual-disc front end you'll simply bleed each front caliper in turn.

1. Open the reservoir cap and remove the diaphragm. Use the syringe or turkey baster to pull most of the old fluid out of the reservoir without letting the level drop low enough to draw air into the master cylinder.
2. Refill the reservoir with fresh fluid from the sealed container, leaving it near the full mark.
3. Attach the clear tubing to the bleeder valve on the caliper and route the other end into the catch bottle. Make sure the tubing fits snugly so air can't sneak in around it.
4. Squeeze and hold the front brake lever (or press and hold the rear pedal). Keep steady pressure on it.
5. Open the bleeder valve about a quarter turn with the box-end wrench. Fluid and air will flow out through the tubing. Watch the reservoir level—it will drop.
6. Close the bleeder valve before you release the lever or pedal. Releasing with the bleeder open will pull air back into the system.
7. Repeat the squeeze-hold-open-close-release cycle until fresh, clean fluid comes through the tubing with no bubbles. Keep topping off the reservoir throughout so it never runs low enough to draw air in.
8. If you're bleeding the front, move to the second front caliper and repeat the process. Then bleed the rear brake using the same steps with the rear pedal and rear caliper bleeder.

Finishing Up and Checking for Leaks

Once clean, bubble-free fluid is flowing, tighten the bleeder valve snugly with the box-end wrench—firm but not overtightened, since the valve is small and easy to damage. Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and wipe away any spilled fluid. Check for leaks at the bleeder valve and at the banjo fittings where the brake lines attach. A dry paper towel wiped around those spots will show any seepage. If you find a leak, address it before riding.

Testing Before You Ride

With the bike still on the stand, pump the lever and pedal a few times. They should feel firm and consistent, not spongy, and they should not slowly sink under steady pressure. Spin each wheel to confirm the brakes aren't dragging—the wheel should turn freely with a slight pad contact sound. Then test the brakes at low speed in a safe area, like a parking lot, before riding normally. If anything feels off, don't ride.

Troubleshooting and When to See a Shop

If the lever won't firm up after several bleeding attempts, if it firms up only after pumping, or if you keep seeing air bubbles, stop and reassess. Persistent air often means a leak somewhere, or that air is trapped in a high spot. Fluid leaking from the master cylinder or caliper is another sign to stop. And remember the ABS caveat: if the reservoir ran dry or the ABS unit was disturbed, the system may need a dealer-level bleed. A lever that never firms up, or any doubt about the ABS or hydraulic lines, is your cue to take the Hypermotard to a professional.

Related Shopping Categories

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Shop Brake Tools for a 2017 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.