Bleeding the Hydraulic Brakes on a 2018 Ducati Scrambler 1100 Special
Shop parts for a 2018 Ducati Scrambler 1100 Special Motorcycle.What This Job Covers on the Scrambler 1100 Special
The 2018 Ducati Scrambler 1100 Special is fitted with hydraulic disc brakes at both ends and is an ABS-equipped model. For routine maintenance, that means you can refresh the fluid and remove air at the caliper bleeders in the usual way. The front and rear circuits are separate hydraulic systems, so each gets its own bleed. This article covers both. It does not cover the hydraulic clutch, and it is not a pad or rotor replacement guide; those jobs are only mentioned here as reasons you might need to bleed afterward. If the reservoir has run dry, or if the ABS unit or its lines have been disconnected, air may have entered the ABS unit itself. A standard caliper bleed may not remove it, and the bike should go to a shop with the appropriate diagnostic equipment.
When a Bleed Is Due
Brake fluid absorbs moisture over time, which lowers its boiling point and can make the brakes fade under hard or repeated use. Even if the Scrambler 1100 Special still stops well, many riders refresh the fluid on a regular schedule. A bleed is also due when the front lever feels spongy or pulls closer to the grip than it used to, when the rear pedal feels soft or travels farther than normal, or when the fluid in either reservoir looks dark or cloudy. Any work that opened the hydraulic system—new lines, caliper service, or master cylinder work—is another clear trigger, because air is likely to have entered. Do not wait for a lever to feel bad before checking the fluid; a quick look at the reservoir can tell you a lot.
Tools and Supplies for a Clean, Controlled 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 the old fluid
- Rags or shop towels, plus 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 neither is required. Keep the fluid container capped when it is not in use, and do not reuse fluid that has been sitting open.
Setting Up Without Damaging the Bike
Support the Scrambler 1100 Special securely upright on a stand so it cannot tip while you are working. For the front circuit, turn the handlebars until 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 space, and keep the reservoir cap and diaphragm clean so grit does not fall into the fluid.
Step-by-Step Bleeding Procedure
- Open the reservoir for the circuit you are bleeding and remove most of the old fluid with a syringe or turkey baster. Do not let the reservoir run dry.
- Refill the reservoir with fresh fluid of the type marked on the cap, leaving it at the correct level for now.
- Attach the clear tubing to the bleeder valve on the caliper you are working on and route the other end into the catch bottle. The tube should fit snugly so air cannot leak in around it.
- For the front brake, squeeze and hold the lever. For the rear brake, press and hold the pedal. Keep steady pressure on it.
- Open the bleeder about a quarter turn and let fluid and air escape through the tube. Watch the tube, not the reservoir, while the bleeder is open.
- Close the bleeder before you release the lever or pedal. Releasing first can draw air back into the caliper.
- Repeat the squeeze-hold-open-close-release cycle until fresh, clean fluid comes through the tube with no bubbles. Check the reservoir often and top it off so it never runs low enough to draw air in.
- If your Scrambler 1100 Special has two front calipers, treat them as separate jobs and bleed each one in turn. As a general practice, start with the caliper farthest from the master cylinder, then move to the closer one.
- Move to the rear circuit and repeat the same process at the rear caliper bleeder, using the pedal instead of the lever.
- When the fluid runs clean and bubble-free at every bleeder, close the last bleeder snugly. Do not overtighten it.
Finishing, Testing, and Troubleshooting
Fill each reservoir to the correct level marking, reinstall the diaphragm and cap, and clean any spilled fluid from the bike. Check for leaks at the bleeder valves and at the banjo fittings before you ride. 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, then test the brakes at low speed in a safe area before riding normally.
If a 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 have the bike inspected. The same applies if you suspect air has entered the ABS unit. A brake system that will not hold a firm feel is not ready for the road.
Related Shopping Categories
Shop Brake Fluid for a 2018 Ducati Scrambler 1100 Special Motorcycle.
Shop Brake Lines for a 2018 Ducati Scrambler 1100 Special Motorcycle.
Shop Brake Pads for a 2018 Ducati Scrambler 1100 Special Motorcycle.
Shop Stands for a 2018 Ducati Scrambler 1100 Special Motorcycle.
Shop Brake Tools for a 2018 Ducati Scrambler 1100 Special 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.
