Bleeding the Brakes on a 2018 Ducati Hypermotard 939
Shop parts for a 2018 Ducati Hypermotard 939 Motorcycle.The 2018 Ducati Hypermotard 939 uses hydraulic disc brakes at both ends, and this model is equipped with ABS. The front lever and rear pedal each operate a hydraulic circuit that can collect moisture, air, and old fluid over time. The front and rear circuits are separate on this bike, so treat them as two distinct bleeding jobs. The ABS unit adds one important caveat: a standard bleed through the caliper bleeders is generally fine for routine fluid refresh, but if the reservoir has run dry or the ABS unit or its lines have been opened, the system may need a dealer-level procedure or diagnostic tool. In that case, stop and take the bike to a shop.
When a Hypermotard 939 Needs a Brake Bleed
A spongy or soft front lever, a rear pedal that feels mushy, or a lever that pulls closer to the grip than it used to are all signs that air or old fluid is affecting the system. Dark or cloudy fluid in the reservoir is another clear indicator. Bleeding is also necessary after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work. Even without symptoms, brake fluid absorbs moisture over time, which lowers its boiling point and can lead to brake fade under hard use. Many riders refresh the fluid on a regular schedule for that reason alone.
What to Gather Before You Start
- 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 basic lever-and-bleeder method works fine with a helper or with patience.
Set Up the Bike and Protect Sensitive Surfaces
Support the Hypermotard 939 securely upright on a stand so it cannot tip while you are working. Turn the handlebars so the front reservoir sits level before you open it. Cover painted surfaces, plastics, and the instrument area with rags, because most brake fluids damage paint and plastic on contact. Wipe up any spill immediately and rinse the area with water. Keep the reservoir cap and diaphragm clean and set them aside where they will not pick up grit.
Bleeding the Front Brake, Step by Step
- Remove the reservoir cap and diaphragm. Use the syringe or turkey baster to remove most of the old fluid from the reservoir, but do not let the reservoir run dry.
- Refill the reservoir with fresh fluid from the sealed container, using the fluid type marked on the cap. Keep the reservoir topped off throughout the job.
- Fit the box-end wrench onto the front caliper bleeder valve. Push the clear tubing over the bleeder nipple and route the other end into the catch bottle.
- Squeeze the front lever slowly and hold 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.
- Repeat the squeeze, hold, open, close, and release sequence. Watch the clear tubing and continue until fresh, clean fluid with no bubbles comes through.
- If your bike has two front calipers, bleed one caliper at a time. As a general practice, start with the caliper farthest from the master cylinder by hose routing, then repeat the process on the other caliper.
- Check the reservoir level often and top it off before it gets low. If the reservoir draws air, you will have to keep bleeding until that air is pushed out.
Bleeding the Rear Brake
The rear brake on the Hypermotard 939 is also hydraulic, so it uses the same basic method with the rear pedal and rear reservoir. Remove most of the old fluid from the rear reservoir, refill with fresh fluid, and attach the clear tubing to the rear caliper bleeder. Press and hold the pedal, open the bleeder about a quarter turn, then close it before releasing the pedal. Repeat until the fluid runs clean and bubble-free, keeping the rear reservoir topped off the whole time. If the pedal still feels soft after several rounds, do not keep pumping and hoping; inspect for leaks and consider whether air may have entered the ABS unit.
Finishing Up and Checking for Leaks
When the fluid runs clean at each bleeder, 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 bike. Check the bleeder and the banjo fittings at the master cylinder and caliper for leaks. Pump the lever and pedal several times and hold steady pressure while you look for weeping fluid or a dropping level.
Test Before Riding and Troubleshooting
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 will not firm up after several bleeding attempts, if it firms up only after pumping, if bubbles keep appearing, if fluid leaks from the master cylinder or caliper, or if you suspect air has entered the ABS unit, stop and have the bike inspected by a shop. Brakes are not a system to ride on with doubts.
Related Shopping Categories
Shop Brake Fluid for a 2018 Ducati Hypermotard 939 Motorcycle.
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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.
