Bleeding 2021 Yamaha XSR700 Brakes at Home

Shop parts for a 2021 Yamaha XSR700 Motorcycle.

The 2021 Yamaha XSR700 is a stylish retro roadster with hydraulic disc brakes front and rear with ABS. The front circuit starts at the master cylinder and reservoir on the right handlebar, while the rear circuit uses a separate master cylinder worked by the foot pedal with its own reservoir. Each circuit is bled on its own through the bleeder on the caliper, so a routine fluid refresh is well within reach for a home mechanic.

Reasons to Refresh the Fluid

Over months and years, brake fluid absorbs moisture. That water lowers the boiling point, so heavy braking can heat the fluid until it boils and forms vapor. Vapor compresses, and the lever goes soft. Moisture also encourages corrosion that can lead to sticky pistons and worn seals.

  • Spongy lever feel or extra lever travel
  • Soft or sinking rear pedal
  • Dark, cloudy fluid in a reservoir
  • Brake fade on long or aggressive rides

Tools and Materials

  • 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 valves
  • Clear tubing and a catch bottle
  • A syringe or turkey baster
  • A screwdriver or driver for the reservoir caps
  • Rags and water for cleanup
  • Optional: a one-way check-valve bleeder or vacuum bleeder

Getting the Bike Ready

Put the bike on a paddock stand or other secure stand so it stays upright and stable. Turn the handlebars until the front reservoir is level. Cover the fuel tank, bodywork, and instruments with rags, since brake fluid can ruin paint and plastic. Clean any spills immediately with water. Wipe the reservoir caps clean before opening.

How to Bleed the Brakes

  1. Remove the front reservoir cap and diaphragm.
  2. Remove most of the old fluid with the syringe, keeping some in the bottom so air can’t enter.
  3. Refill the reservoir with fresh fluid.
  4. Connect the clear tube to the front caliper bleeder, running the other end into the catch bottle.
  5. Squeeze and hold the lever.
  6. Open the bleeder about a quarter turn.
  7. Close the bleeder before releasing the lever.
  8. Repeat, topping off the reservoir every few strokes.
  9. When the fluid in the tube is clean and free of bubbles, close the bleeder.
  10. Bleed the second front caliper, if your bike has one.
  11. Move to the rear caliper and repeat using the foot pedal and rear reservoir.

Keep Air Out of the ABS

The ABS unit sits between the master cylinders and calipers. If a reservoir runs low and air enters the master cylinder, that air can reach the ABS unit, where a standard caliper bleed may not clear it. Watch the reservoir levels closely and refill well before they get low.

Pro Tips

  • Smooth, full strokes move fluid better than quick pumping.
  • Gently tap the caliper to dislodge stubborn bubbles.
  • Keep fluid off the pads and rotors, and clean them right away if contaminated.
  • Discard collected fluid rather than reusing it.

After the Bleed

Tighten the bleeders snugly without overtightening. Fill each reservoir to its correct level mark, reinstall the diaphragms and caps, and clean the area. Check for leaks at the bleeders and fittings, and dispose of the old fluid properly. Both controls should feel firm and should not creep under steady pressure. Spin the wheels to check for drag, and test the brakes at low speed in a safe area before riding.

Know When to Get Help

If a reservoir ran dry or the ABS unit or its lines were disconnected, air may have entered the ABS unit, and the system may require a dealer-level procedure or diagnostic tool. Also see a shop if the lever stays soft after repeated bleeding or if a master cylinder or caliper leaks.

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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.