How To Bleed 2017 Ducati Scrambler Desert Sled Motorcycle Brakes

How to Bleed the Brakes on a 2017 Ducati Scrambler Desert Sled

Know the Layout Before You Touch Anything

The 2017 Ducati Scrambler Desert Sled stops on hydraulic disc brakes at both ends, and it came from the factory with an anti-lock braking system. That combination shapes the whole job. You have two separate hydraulic circuits to service — one fed by the front master cylinder on the handlebar, one fed by the rear master cylinder near the pedal — and each has its own reservoir, its own bleeder at the caliper, and its own fluid supply that has to be watched while you work.

Because ABS is fitted, a normal bleed through the caliper bleeders is exactly the right way to push old fluid out and refresh the system. What you should not attempt at home is purging air that has traveled into the ABS modulator itself. If the reservoir ever ran dry while the system was open, or if the ABS unit or its hard lines were disconnected for any reason, the modulator can trap air that a lever-and-bleeder routine will not move. That job needs a diagnostic tool to cycle the pump, and it belongs at a dealership or a well-equipped shop.

When a Bleed Is Actually Due

Brake fluid is hygroscopic, meaning it pulls moisture out of the air over time. Moisture does two bad things: it lowers the fluid's boiling point, so hard repeated braking can boil the fluid and give you a soft, fading lever, and it darkens the fluid and encourages corrosion inside the calipers and master cylinders. That is why many riders flush the brakes on a schedule even when nothing feels wrong.

On top of the calendar, bleed whenever the lever or pedal tells you to. A front lever that feels spongy, pulls noticeably closer to the grip than it used to, or slowly sinks while you hold steady pressure is air in the system. The same goes for a rear pedal with a long, vague travel. Dark, cloudy, or gritty-looking fluid in either reservoir is another clear signal. Finally, any work that opened the hydraulic system — new lines, a caliper rebuild, master cylinder service, or a fluid top-up after a leak — means air got in and has to come out.

Tools and Supplies to Have Ready

• Fresh brake fluid of the type printed on the master cylinder reservoir cap, from a sealed container. Do not substitute a different specification.
• A box-end wrench that fits the bleeder valve snugly. A box-end grips the flats far better than an open-end and is much less likely to round the bleeder.
• A length of 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 reservoirs.
• The correct driver for the reservoir cap screws on both the front and rear master cylinders.
• Optional but genuinely helpful for solo work: a one-way check-valve bleeder or a vacuum bleeder, which removes most of the open-close timing from the job.

Set Up the Bike and Protect the Paint

Get the Desert Sled standing securely upright on a stable stand so it cannot tip while you are leaning on the lever. Turn the handlebar until the front reservoir sits level — on a Scrambler that usually means a slight turn from straight ahead — because an angled reservoir will spill fluid the moment the cap comes off.

Brake fluid attacks paint and many plastics on contact, so drape rags over the tank area, the instrument cluster, the front fender, and anything else below the reservoirs. Keep a water-soaked rag nearby; if a drop lands on a painted surface, wipe it immediately and rinse the area with plain water. Work slowly around the reservoirs and never shake a bottle of fluid before pouring.

Bleeding the Front Brake Circuit

1. Wipe the reservoir cap and the area around it clean so dirt cannot fall in, then remove the cap and the diaphragm.
2. Use the syringe or baster to draw most of the old fluid out of the reservoir. Leave enough in the bottom that you are not pulling air into the master cylinder port.
3. Top the reservoir up with fresh fluid from the sealed container.
4. Slip the clear tubing over the front caliper bleeder and route the other end into the catch bottle, with the bottle positioned so the tubing runs upward before it drops — that keeps air from traveling back toward the caliper.
5. Fit the box-end wrench onto the bleeder.
6. Squeeze the front lever firmly and hold it. Do not release it yet.
7. Open the bleeder about a quarter turn. Fluid and any trapped air will push out through the tubing. Watch the tube, not the reservoir, while the bleeder is open.
8. Close the bleeder snugly before you release the lever. Releasing with the bleeder open draws air straight back into the caliper.
9. Release the lever slowly, then check the reservoir level and top it off. Repeat the squeeze-hold-open-close-release cycle until the fluid coming through the tubing is clean, bright, and free of bubbles.
10. If your Desert Sled carries more than one front caliper, bleed them one at a time, finishing with the caliper farthest from the master cylinder.

Bleeding the Rear Brake Circuit

1. Clean around the rear reservoir cap, then open it and remove the diaphragm.
2. Draw out the old fluid with the syringe, leaving the bottom of the reservoir covered, and refill with fresh fluid.
3. Attach the clear tubing to the rear caliper bleeder and lead it into the catch bottle.
4. Press and hold the brake pedal down firmly.
5. Open the bleeder a quarter turn and let fluid and air escape.
6. Close the bleeder before letting the pedal return.
7. Let the pedal come back up, top off the reservoir, and repeat until the fluid runs clean and bubble-free.

Throughout both circuits, the single most important habit is keeping the reservoir from running dry. Check the level after every few cycles, not after every ten. A reservoir that empties pulls air into the master cylinder and turns a twenty-minute job into an afternoon of chasing bubbles.

Finishing Up and Checking for Leaks

When the fluid runs clean at both ends, close each bleeder snugly — firm enough to seal, without cranking on it hard enough to damage the seat or the caliper threads. Fill each reservoir to the level marking molded into it, reinstall the diaphragm and cap, and wipe down every surface you touched. Then inspect the bleeder fittings and the banjo bolts at both calipers and both master cylinders for any weeping or dampness. A dry paper towel pressed against each joint will show a leak instantly.

Test Before You Ride

With the bike still on the stand, pull the front lever and press the rear pedal. Both should feel firm and consistent, and neither should creep toward the grip or the floor under steady pressure held for several seconds. Spin each wheel by hand to confirm the brakes are not dragging. Then, in a safe, empty area at walking pace, apply each brake separately and confirm it bites normally before you ride at speed.

When to Stop and Call a Shop

If the lever will not firm up after several full bleeding cycles, if it only firms up after a few quick pumps, if bubbles keep appearing no matter how long you bleed, or if you find fluid weeping from a master cylinder or caliper, stop and have the bike inspected. The same applies to any Desert Sled where the reservoir ran dry or the ABS unit was disturbed — that air needs a diagnostic tool to cycle the pump, and no amount of lever pumping at home will clear it.

Related Shopping Categories

Shop Brake Fluid for a 2017 Ducati Scrambler Desert Sled Motorcycle.

Shop Brake Lines for a 2017 Ducati Scrambler Desert Sled Motorcycle.

Shop Brake Pads for a 2017 Ducati Scrambler Desert Sled Motorcycle.

Shop Stands for a 2017 Ducati Scrambler Desert Sled Motorcycle.

Shop Brake Tools for a 2017 Ducati Scrambler Desert Sled 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.