Bleeding the Brakes on a 2007 Ducati Monster S2R 800
Shop parts for a 2007 Ducati Monster S2R 800 Motorcycle.The 2007 Ducati Monster S2R 800 uses hydraulic disc brakes at both ends, and it is a conventional system rather than an ABS or linked-brake setup. That means the job is straightforward: remove old fluid, push fresh fluid through the front and rear circuits, and make sure no air remains. Because brakes are safety-critical, work methodically and stop if anything feels unclear.
When the S2R 800 Needs a Bleed
A spongy lever, a rear pedal that feels soft or travels farther than usual, or a lever that pulls closer to the grip are classic signs that air or moisture has entered the hydraulic system. Dark, cloudy, or contaminated fluid in the reservoir is another reason to service the brakes. Fluid also absorbs moisture over time, which lowers its boiling point and can contribute to fade under hard use, so many riders refresh it on a regular schedule even when the brakes still feel acceptable.
Bleeding is also necessary after any work that opened the hydraulic circuit, such as installing new brake lines, servicing a caliper, or repairing the master cylinder. On this Monster S2R 800, treat the front and rear systems as separate jobs and complete one before moving to the other.
Tools and Supplies to Have Ready
- 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
- Clear tubing that fits snugly over the bleeder valve
- A clean catch bottle for used fluid
- Rags or shop towels, plus water for rinsing spills
- A syringe or turkey baster for removing old fluid from the reservoir
- A screwdriver or driver that fits the reservoir cap screws
- Optional: a one-way check-valve bleeder or vacuum bleeder to make one-person bleeding easier
Set Up and Protect the Bike
Support the motorcycle securely upright on a stand so it cannot tip while you are working. For the front brake, turn the handlebars so the front master cylinder reservoir sits level before you open it. The rear reservoir also needs to be level for the rear bleed. Cover painted surfaces, plastic bodywork, and the instrument area with rags, because brake fluid can damage paint and plastic on contact. If a spill happens, wipe it up immediately and rinse the area with water.
The Step-by-Step Bleed
- Work on one brake system at a time. Open the reservoir cap and diaphragm, then use the syringe or baster to remove most of the old fluid. Do not let the reservoir run dry.
- Refill the reservoir with fresh fluid from the sealed container, leaving room for the diaphragm and cap later.
- Push the clear tubing onto the bleeder valve and route the other end into the catch bottle. Keep the tube end submerged in fluid if possible.
- For the front brake, squeeze the lever slowly and hold it. For the rear, press and hold the pedal.
- Open the bleeder about a quarter turn with the box-end wrench. Fluid and air will move out through the tube.
- Close the bleeder before releasing the lever or pedal. Releasing first can draw air back into the system.
- Repeat the squeeze-hold-open-close-release sequence until fresh, clean fluid comes through the tube with no bubbles.
- Check the reservoir often and top it off throughout the procedure. If it runs low enough to draw air, you will have to start over.
- If your S2R 800 has more than one front caliper, treat each caliper as its own bleed point. Finish one completely, then move to the other. As a general practice, start with the caliper farthest from the master cylinder if the layout makes one clearly farther; otherwise work one caliper fully, then the other.
- For the rear brake, repeat the same sequence at the rear caliper bleeder using the pedal. Keep the rear reservoir topped off as you go.
Finishing the Job
When clean, bubble-free fluid has come through and the lever or pedal feels firm, tighten the bleeder snugly with the box-end wrench. Do not overtighten it; snug is enough to seal it without damaging the valve. Fill the reservoir to the correct level marking, reinstall the diaphragm and cap, and wipe away any spilled fluid. Check the bleeder and the banjo fittings for leaks, then operate the brake a few times and inspect again.
Test Before Riding
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. Before riding normally, test the brakes at low speed in a safe area and make sure both ends slow the bike predictably.
Troubleshooting and When to Stop
If the lever or pedal will not firm up after several bleeding attempts, if it firms only after pumping, or if bubbles keep appearing, stop and diagnose the problem rather than continuing to ride. Fluid leaking from the master cylinder, caliper, or fittings also requires attention before the bike is used. Because this S2R 800 is a conventional system, there is no ABS module or linked-brake sequence to worry about here, but if the reservoir ran dry or a hydraulic line was opened, air may be deeper in the system than a simple caliper bleed can remove. In that case, have a shop inspect and bleed the brakes properly.
Related Shopping Categories
Shop Brake Fluid for a 2007 Ducati Monster S2R 800 Motorcycle.
Shop Brake Lines for a 2007 Ducati Monster S2R 800 Motorcycle.
Shop Brake Pads for a 2007 Ducati Monster S2R 800 Motorcycle.
Shop Stands for a 2007 Ducati Monster S2R 800 Motorcycle.
Shop Brake Tools for a 2007 Ducati Monster S2R 800 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.
