Bleeding the Brakes on a 2024 Ducati Monster 937 SP

Shop parts for a 2024 Ducati Monster 937 SP Motorcycle.

The 2024 Ducati Monster 937 SP uses hydraulic disc brakes at both ends and is equipped with ABS. That means the front lever and rear pedal each act on a hydraulic circuit that can collect air and moisture over time. A proper bleed refreshes the fluid and removes trapped air so the lever and pedal stay firm. The ABS unit adds one important caveat: a normal caliper bleed is the right way to refresh fluid, but if air has entered the ABS unit itself, the job may need dealer-level equipment.

Why and When to Bleed the Monster’s Brakes

Bleeding is due when the front lever feels spongy or pulls closer to the grip than it used to, when the rear pedal feels soft or inconsistent, or when the fluid in either reservoir looks dark or cloudy. It is also necessary after any work that opened the hydraulic system, such as installing new lines, servicing a caliper, or repairing the master cylinder. Even without symptoms, brake fluid absorbs moisture from the air over time. That moisture lowers the fluid’s boiling point and can lead to brake fade under hard use, so many riders refresh it on a regular schedule. On the 2024 Ducati Monster 937 SP, treat the front and rear as separate circuits and give each one a complete bleed.

Tools and Supplies for the Job

  • 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 snugly
  • Clear tubing that fits tightly over the bleeder valve
  • 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 when working alone, but the manual lever-and-bleeder method works fine with a helper or careful technique. Keep the fluid container closed when not in use and never reuse fluid that has been sitting open.

Preparing the Bike and Work Area

Support the Monster 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, plastic panels, 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 area and keep used fluid away from children and pets.

Step-by-Step Brake Bleeding Procedure

Work on one circuit at a time. The steps below describe the front brake; use the same approach for the rear, substituting the pedal for the lever and keeping the rear reservoir topped off. If your bike has two front calipers, bleed one caliper fully before moving to the other, and follow a consistent one-at-a-time approach. As a general practice, start with the caliper farthest from the master cylinder.

  1. Remove the reservoir cap and diaphragm, then use the syringe or turkey baster to remove most of the old fluid. Do not let the reservoir run dry.
  2. Refill the reservoir with fresh fluid of the type marked on the cap. Keep the reservoir open while you work, but keep the area clean and covered.
  3. 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.
  4. Squeeze and hold the front lever, or press and hold the rear pedal. Keep steady pressure on it.
  5. Open the bleeder about a quarter turn to let fluid and air escape. Close the bleeder before you release the lever or pedal. Never release pressure while the bleeder is open, or air can be drawn back in.
  6. Repeat the squeeze-hold-open-close-release sequence until fresh, clean, bubble-free fluid comes through the tube. Check the reservoir after every few strokes and top it off so it never runs low enough to draw air into the system.
  7. When the fluid runs clear and free of bubbles, close the bleeder snugly without overtightening. Reinstall the diaphragm and cap.
  8. Move to the other front caliper if your bike has two, then repeat the entire process on the rear brake using the pedal.

Finishing the Job and Checking for Leaks

Fill each reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the bike. Check the bleeder valves and the banjo fittings at the master cylinder and calipers for weeping or drips. A dry shop towel wiped around each fitting will show fresh fluid quickly. Pump the lever and pedal several times and recheck the fluid level before you put the covers back on.

Testing Before You Ride

The front lever and rear pedal should feel firm and consistent, not spongy, and they should not slowly sink while you hold 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 either brake feels different from what you expect, stop and recheck your work rather than riding it out.

Troubleshooting and When to Visit a Shop

A lever or pedal that will not firm up after several bleeding attempts, one that firms up only after pumping, persistent air bubbles, or fluid leaking from the master cylinder or caliper all point to a problem that may be beyond a simple bleed. If the reservoir ran dry, if the ABS unit or its lines were disconnected, or if you suspect air has entered the ABS unit itself, the 2024 Ducati Monster 937 SP should go to a shop with the equipment to cycle and bleed the ABS system properly. Do not guess at an ABS bleed procedure or keep riding with a soft brake. A firm, consistent lever and pedal are the confirmation that the job was done correctly.

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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.