How To Bleed 2009 Ducati Streetfighter S Motorcycle Brakes

Bleeding the Brakes on a 2009 Ducati Streetfighter S

What You Are Working With on This Bike

The 2009 Ducati Streetfighter S uses hydraulic disc brakes at both ends, and the S trim of that model year was sold with ABS as part of its electronics package. So the layout you are dealing with is a front master cylinder at the lever feeding the front caliper or calipers, a rear master cylinder at the pedal feeding the rear caliper, and an ABS modulator plumbed between the two circuits. There is no linked or combined braking on this machine, which keeps things simple: the front lever works the front brake only, and the rear pedal works the rear brake only.

For a normal fluid refresh, or a bleed after you have replaced a line, rebuilt a caliper, or done master cylinder work, you can do the job at the caliper bleeders with hand tools. The ABS unit only changes the plan if air has actually gotten inside the modulator itself, and that is covered further down.

Signs That It Is Time to Bleed

The most obvious cue is feel. A lever that goes soft or spongy, or that now comes back much closer to the grip than it used to, is telling you there is air in the system or the fluid has degraded. The same goes for a rear pedal that feels vague or needs a pump before it bites. Pull the reservoir cap and look at the fluid: dark, cloudy, or discolored fluid is past its useful life even if the lever still feels acceptable.

Any job that opened the hydraulic circuit is an automatic trigger — new brake lines, a caliper off the bike, a master cylinder rebuild, or a reservoir that ran dry. Beyond that, brake fluid pulls moisture out of the air over time, and moisture lowers the fluid's boiling point. A bike that sees hard use, track days, or long descents can fade when the fluid gets hot, so many riders simply refresh the fluid on a regular interval rather than waiting for a symptom to appear.

Tools and Supplies to Have Ready

• Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container — once a container is opened, it starts absorbing moisture
• A box-end wrench that fits the bleeder valve snugly
• Clear tubing that fits tightly over the bleeder nipple, plus a catch bottle to hang it in
• Rags or shop towels, and a syringe or turkey baster for pulling old fluid out of the reservoir
• The correct driver for the reservoir cap screws
• Optional but helpful: a one-way check-valve bleeder or a vacuum bleeder, which makes a one-person job much easier

Setting Up Before You Open Anything

Get the bike held securely upright on a stand so the reservoirs sit level. For the front, turn the bars until the reservoir on the lever is as flat as it can be. Then cover the surrounding area — the instrument cluster, the plastics, the painted surfaces around the reservoir and calipers — with rags. Brake fluid attacks paint and plastic quickly, so any drip needs to be wiped up immediately and the area rinsed with water. Keep the rags over the reservoir while the cap is off, because a squeezed lever with the cap removed can spit fluid.

Bleeding the Front Brake

1. Remove the reservoir cap and diaphragm, then use the syringe or baster to draw most of the old fluid out of the reservoir. Do not pump the lever while the reservoir is low.
2. Top the reservoir up with fresh fluid from the sealed container.
3. Push the clear tubing onto the front bleeder valve and route the other end into the catch bottle, with the bottle positioned so the tube runs upward away from the bleeder.
4. Squeeze the front lever and hold it steady against the grip.
5. Open the bleeder about a quarter turn. Fluid and any trapped air will push out through the tube. Watch the tube, not the reservoir, while the bleeder is open.
6. Close the bleeder fully before you release the lever. Releasing with the bleeder open pulls air back into the caliper.
7. Release the lever, then repeat the squeeze–hold–open–close–release cycle. Check the reservoir level every few cycles and top it off so it never draws air.
8. Keep going until the fluid coming through the tube is clean and free of bubbles, and the lever feels firm.

If your bike has two front calipers, bleed each one in turn rather than trying to do both at once. As a general habit, start with the caliper farthest from the master cylinder in terms of hydraulic path, then move to the closer one, and finish with a final pass on the first caliper if the lever still is not where you want it.

Bleeding the Rear Brake

The rear circuit follows the same logic with the pedal instead of the lever. Pull the old fluid from the rear reservoir, refill with fresh, fit the tubing to the rear bleeder, then press and hold the pedal, crack the bleeder a quarter turn, close it, and only then release the pedal. Repeat until the fluid runs clean and bubble-free and the pedal feels solid. Keep an eye on the rear reservoir level throughout — it is small and empties faster than you expect.

Finishing the Job

When both circuits are done, snug the bleeder valves down firmly without overtightening them — they seal on a taper and do not need to be cranked. Fill each reservoir to the level marking, reinstall the diaphragm and cap, and wipe down every surface that saw fluid. Then look closely at the bleeder valves and at the banjo fittings at the master cylinders and calipers for any weeping or dampness.

Testing Before You Ride

Both the lever and the pedal should feel firm and consistent, and should hold pressure without slowly sinking while you keep a steady squeeze on them. Spin each wheel by hand to confirm the brakes are not dragging. Then, in a safe open area at low speed, test the brakes gently before riding normally.

When to Stop and Take It to a Shop

If the lever will not firm up after several honest attempts, if it only firms up when you pump it, or if bubbles keep appearing no matter how long you bleed, stop. The same applies if fluid is leaking from the master cylinder or a caliper. And because this Streetfighter S has ABS, any situation where the reservoir ran dry, the ABS unit was removed, or a line to the modulator was opened can leave air trapped inside the ABS unit that a caliper bleed will not clear. That requires a dealer-level procedure, so have the bike transported rather than ridden.

Related Shopping Categories

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Shop Brake Tools for a 2009 Ducati Streetfighter 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.