Bleeding the Brakes on Your 2015 MV Agusta F3 800 Ago

Shop parts for a 2015 MV Agusta F3 800 Ago Motorcycle.

The 2015 MV Agusta F3 800 Ago uses hydraulic disc brakes at both ends and is fitted with ABS. That means routine bleeding is done at the caliper bleeders, with the front and rear circuits treated separately. The ABS unit does not change the basic lever-and-bleeder routine for a fluid refresh, but it does raise the stakes if the reservoir ever runs dry or a line is opened upstream of the calipers. Work deliberately, keep the reservoir fed, and stop if the lever or pedal will not firm up.

When a Bleed Is Due on the F3 800 Ago

A spongy front lever, a rear pedal that feels vague or long, a lever that now pulls closer to the grip, dark or cloudy fluid in either reservoir, or any recent work that opened the hydraulic system are all reasons to bleed the F3 800 Ago. Brake fluid absorbs moisture over time, which lowers its boiling point and can encourage fade under hard use. Many riders refresh the fluid on a regular schedule even when the brakes still feel acceptable, because the fluid can be past its best before the lever gives obvious warning.

Tools and Supplies for a Clean Bleed

  • Fresh brake fluid of the type marked on the master cylinder reservoir cap, from a sealed container. Do not substitute by guesswork.
  • A box-end wrench that fits the bleeder valve snugly.
  • Clear tubing that fits tightly over the bleeder and reaches a catch bottle.
  • A catch bottle, rags or shop towels, and a syringe or turkey baster for removing old fluid.
  • The correct driver for the reservoir cap screws.
  • Optional one-way check-valve bleeder or vacuum bleeder for one-person work.

Prepare the Bike and Protect Sensitive Surfaces

Support the bike securely upright on a stand on level ground. Turn the handlebars so the front reservoir sits level before you open it. Cover painted surfaces, plastic bodywork, and the instrument area with rags; brake fluid damages paint and plastic on contact. Clean around the reservoir cap before removal so grit does not fall into the fluid. If a spill happens, wipe it up immediately and rinse the area with water.

Bleeding the Front Brake Circuit

  1. Remove the reservoir cap and diaphragm. Use a syringe or turkey baster to draw most of the old fluid from the reservoir, leaving enough to cover the port at the bottom. Do not pump the lever with the reservoir empty.
  2. Fill the reservoir with fresh fluid to the upper level. Keep the cap nearby, but do not seal it yet.
  3. Fit the box-end wrench on the front caliper bleeder. Push the clear tubing onto the bleeder and route it into the catch bottle. The tube end should sit below the surface of a little fluid in the bottle.
  4. Squeeze the front lever several times, then hold it firmly against the grip. With the lever held, open the bleeder about a quarter turn. Fluid and air will move through the tube. Close the bleeder before releasing the lever. Never release the lever while the bleeder is open.
  5. Repeat the squeeze-hold-open-close-release cycle. Check the reservoir after every few cycles and top it off. If the reservoir gets low, stop and refill before continuing; pulling air into the master cylinder or ABS unit is the main way a simple bleed turns into a shop job.
  6. Continue until the fluid in the clear tube is clean and free of bubbles. If the bike has more than one front caliper, bleed each caliper individually, one at a time, and follow the hydraulic path from the master cylinder rather than rushing between them. In general, start with the caliper farthest from the master cylinder, then move to the closer one.
  7. When the front circuit is done, close the bleeder snugly. Do not overtighten it. Recheck the bleeder for weeping.

Bleeding the Rear Brake Circuit

The rear brake is a separate hydraulic circuit. Use the same clean, patient approach, but operate the pedal instead of the lever and keep the rear reservoir topped throughout.

  1. Clean the rear reservoir cap area, open it, remove most of the old fluid, and refill with fresh fluid.
  2. Attach the wrench and clear tubing to the rear caliper bleeder, routing the tube into the catch bottle.
  3. Press the pedal several times and hold pressure. Open the bleeder about a quarter turn, then close it before releasing the pedal. Repeat.
  4. Watch the tube and reservoir. Continue until the fluid runs clean and bubble-free, topping off as needed. Close the bleeder snugly without overtightening.

Finishing, Testing, and Troubleshooting

Fill both reservoirs to the correct level marking, then reinstall the diaphragms and caps. Clean any spilled fluid with rags and rinse the area with water. Check for leaks at the bleeder valves and at the banjo fittings. Pump the front lever and rear pedal; both should feel firm and consistent, not spongy, and neither should slowly sink under 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 the lever or pedal will not firm up after several bleeding attempts, if it firms 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 the reservoir ran dry or if the ABS unit or its lines were disconnected; air trapped in the ABS unit may require a dealer-level procedure or diagnostic tool. Do not ride a motorcycle with a soft or inconsistent brake.

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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.