はじめに

Use this guide to replace the fluid in and bleed the air from your Avid hydraulic caliper brakes.

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Remove the wheel of the calipers you are going to bleed, and remove the brake pads. Install Avid® brake block.
  • Remove the wheel of the calipers you are going to bleed, and remove the brake pads.

  • Install Avid® brake block.

    • You can substitute a 10mm wide block, such as a hex key, if necessary.

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Levers set for a long reach may have the reservoir closed and will not permit bleeding.
  • Levers set for a long reach may have the reservoir closed and will not permit bleeding.

  • Measure from the center of handlebar to the tip of brake lever. The distance should be no more than 80 mm.

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If present, set the volume of the caliper system with the adjusting knobs on the lever.
  • If present, set the volume of the caliper system with the adjusting knobs on the lever.

    • On the right-hand lever, turn knob completely counterclockwise, then back clockwise one turn.

    • On the left-hand lever: turn knob completely clockwise, then back counter-clockwise one turn.

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  • Rotate the bike and brake levers as necessary to ensure an upward flow from the caliper to the lever bleed screw.

  • Loosen brake lever bolts just enough to allow you to rotate levers to different angles.

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  • Install Avid® caliper piston block.

    • This keeps the pistons in position. If pistons were to move, the system would overfill with brake fluid.

  • If no block is available. substitute a 10 mm hex key.

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Check to make sure the half-full syringe is free of bubbles and that the tubing clip is closed.
  • Check to make sure the half-full syringe is free of bubbles and that the tubing clip is closed.

  • At the caliper, remove bleed port screw using a T10 Torx driver.

    • Screw is located in the center of the banjo bolt that attaches the hose to the caliper.

  • Remove port screw and insert the syringe into the fitting.

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  • Remove screw front the bleed port near the brake lever.

  • Thread in the quarter-full bleed syringe.

    • This syringe will accept the overflow from the caliper syringe during the bleeding process.

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Open tubing clamp clips on both syringes. Hold the lower syringe to help prevent any air from entering the caliper body.
  • Open tubing clamp clips on both syringes.

  • Hold the lower syringe to help prevent any air from entering the caliper body.

  • Push the lower syringe plunger to move fluid through the system and out into the lever syringe.

  • Inspect for air bubbles.

  • Inspect for dirty or contaminated fluid

  • Push lower syringe plunger until mostly empty of fluid.

    • Do not fully empty syringe.

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  • Close tubing clip on lever syringe.

  • Leave caliper syringe tubing clip open.

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Pull brake lever against the handlebar.
  • Pull brake lever against the handlebar.

  • Secure to the lever to the bar with a toe strap or rubber band.

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At lower caliper syringe, push plunger gently to pressurize the system, and then pull back on the plunger.
  • At lower caliper syringe, push plunger gently to pressurize the system, and then pull back on the plunger.

  • Repeat this process three or four times to pressurize and then apply a vacuum to the caliper.

  • Inspect for any air coming back into syringe.

  • Leave caliper syringe open.

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Remove the strap holding lever, but hold it against the bar with your hand.
  • Remove the strap holding lever, but hold it against the bar with your hand.

  • Push caliper syringe plunger and allow the lever to slowly move away from the bar as fluid flows to the caliper.

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  • Close the tubing clip at caliper syringe.

  • Unthread caliper syringe and reinstall bleed port screw.

  • Clean off any fluid with alcohol or soapy water.

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Open tubing clamp of syringe at lever.
  • Open tubing clamp of syringe at lever.

  • Pull back on the plunger to create a vacuum, then push the plunger down.

  • Pull the brake lever slightly and allow it to snap back to help purge any bubbles remaining in lever body.

  • Repeat this process 10 times, or until no more bubbles appear in the tubing.

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  • Push the plunger gently as lever syringe is unthreaded from lever.

  • Remove the syringe and install the bleed port screw.

  • Clean up any spilled fluid with alcohol or soapy water.

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  • Reinstall brake pads and wheel.

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  • Pull the brake lever to bring the pistons to the rotor.

  • Lever should feel firm when pulled with force.

  • Repeat bleed if necessary.

  • Empty the syringes into an appropriate container and store them with their clamps open.

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まとめ

To reassemble your device, follow these instructions in reverse order.

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