Bleeding the Brakes on a 2018 Ducati SuperSport S
Shop parts for a 2018 Ducati SuperSport S Motorcycle.
The 2018 Ducati SuperSport S uses hydraulic disc brakes at both wheels and is equipped with ABS. That means the front lever and rear pedal each operate a closed hydraulic circuit, and a proper bleed removes old fluid and trapped air from those circuits. This guide covers a fluid flush and air removal for the SuperSport S. It does not cover replacing pads, rotors, calipers, or lines, though those jobs are common reasons a brake system needs bleeding afterward.
When a Bleed Is Due on a 2018 SuperSport S
Bleeding is not only for a brake system that has just been opened. On a street bike like the SuperSport S, brake fluid absorbs moisture over time. That moisture lowers the fluid’s boiling point, which can lead to brake fade under hard or repeated use. Many riders refresh the fluid on a regular schedule even when the brakes still feel normal, because the change happens slowly and is easy to overlook.
There are also clear symptoms that point to a bleed. A spongy or soft front lever, a lever that pulls closer to the grip than it used to, a rear pedal that feels vague, or fluid that looks dark or cloudy in the reservoir are all signs that the system needs attention. Bleeding is also required after any work that opened the hydraulic system, such as new brake lines, caliper service, or master cylinder work. Because this SuperSport S has ABS, a standard bleed at the calipers is generally enough to refresh fluid, but if the reservoir has run dry or the ABS unit or its lines have been disconnected, air may be trapped in the ABS unit itself. That situation may require a dealer-level procedure or diagnostic tool, and it is best handled by a shop.
Tools and Supplies for a Clean Bleed
- 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 used 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 for one person, but the basic lever-and-bleeder method works fine with a little patience. Keep the catch bottle low and stable so the clear tubing stays routed away from painted surfaces.
Preparing the Bike and the Work Area
Support the SuperSport S securely upright on a stand. 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. If a spill happens, wipe it up immediately and rinse the area with water. Do not let fluid sit on the bike while you finish the job.
Work in a well-ventilated area and keep the reservoir cap and diaphragm clean. Before adding any fluid, confirm the required fluid type on the reservoir cap and use only fresh fluid from a sealed container. Do not top off with fluid that has been open for a long time or stored in a dirty container.
Step-by-Step Bleeding Procedure
- With the bike supported and the front reservoir level, remove the reservoir cap and diaphragm. Use the syringe or turkey baster to remove most of the old fluid from the reservoir, but leave enough to keep the bottom covered so you do not push air into the master cylinder.
- Refill the reservoir with fresh fluid of the type marked on the cap. Keep the cap and diaphragm nearby and clean.
- Attach the clear tubing to the bleeder valve and route the other end into the catch bottle. Fit the box-end wrench over the bleeder valve.
- For the front brake, squeeze the lever and hold it. For the rear brake, press and hold the pedal. Keep steady pressure on the lever or pedal.
- Open the bleeder about a quarter turn. Fluid and any trapped air will move through the clear tubing. Watch the tube, not the reservoir, while the bleeder is open.
- Close the bleeder before releasing the lever or pedal. This order matters: if you release the lever or pedal while the bleeder is open, air can be drawn back into the system.
- Release the lever or pedal slowly, then check the reservoir level. Top it off with fresh fluid before it gets low. Never let the reservoir run dry during the bleed.
- Repeat the squeeze, hold, open, close, and release sequence until fresh, clean fluid comes through the tube with no bubbles. If your SuperSport S has two front calipers, bleed one caliper fully, then repeat the process on the other caliper, keeping the reservoir topped off throughout.
- As a general practice, start with the caliper farthest from its master cylinder and work toward the closer one. On the front system, work one caliper at a time so you can confirm clean fluid and no air at each bleeder.
- Move to the rear brake and repeat the same sequence using the rear pedal and rear reservoir. Check the rear reservoir level often and top it off with fresh fluid as needed.
- When clean, bubble-free fluid comes through at each bleeder, close the bleeder snugly. Tighten it firmly without overtightening, since the bleeder does not need to be crushed to seal.
- Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the bike.
Finishing the Job and Checking for Leaks
After the final bleeder is closed, check for leaks at the bleeder valves and at the banjo fittings. A dry shop towel wiped around each fitting will show fresh fluid quickly. Recheck the reservoir level after a few lever or pedal strokes, because trapped air can migrate and change the level slightly. Make sure the cap and diaphragm are seated correctly and that no fluid is pooled around the reservoir.
Test Ride and Troubleshooting
Before riding, 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 will not firm up after several bleeding attempts, if it firms up only after pumping, if bubbles keep appearing, or if fluid is leaking from the master cylinder or caliper, stop and diagnose the problem. Because this SuperSport S has ABS, any sign that air entered the ABS unit is a reason to take the bike to a shop rather than continuing to bleed at the calipers. A brake system that will not hold a firm lever is not ready to ride.
Related Shopping Categories
Shop Brake Fluid for a 2018 Ducati SuperSport S Motorcycle.
Shop Brake Lines for a 2018 Ducati SuperSport S Motorcycle.
Shop Brake Pads for a 2018 Ducati SuperSport S Motorcycle.
Shop Stands for a 2018 Ducati SuperSport S Motorcycle.
Shop Brake Tools for a 2018 Ducati SuperSport S 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.
