Einleitung
Use this guide to replace the fluid in and bleed the air from your Avid hydraulic caliper brakes.
Was du brauchst
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Remove the wheel of the calipers you are going to bleed, and remove the brake pads.
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Install Avid® brake block.
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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.
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On the right-hand lever, turn knob completely counterclockwise, then back clockwise one turn.
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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.
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Loosen brake lever bolts just enough to allow you to rotate levers to different angles.
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Check to make sure the half-full syringe is free of bubbles and that the tubing clip is closed.
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At the caliper, remove bleed port screw using a T10 Torx driver.
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Screw is located in the center of the banjo bolt that attaches the hose to the caliper.
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Remove port screw and insert the syringe into the fitting.
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Remove screw front the bleed port near the brake lever.
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Thread in the quarter-full bleed syringe.
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Open tubing clamp clips on both syringes.
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Hold the lower syringe to help prevent any air from entering the caliper body.
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Push the lower syringe plunger to move fluid through the system and out into the lever syringe.
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Inspect for air bubbles.
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Inspect for dirty or contaminated fluid
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Push lower syringe plunger until mostly empty of fluid.
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Pull brake lever against the handlebar.
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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.
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Repeat this process three or four times to pressurize and then apply a vacuum to the caliper.
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Inspect for any air coming back into syringe.
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Leave caliper syringe open.
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Remove the strap holding lever, but hold it against the bar with your hand.
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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.
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Unthread caliper syringe and reinstall bleed port screw.
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Clean off any fluid with alcohol or soapy water.
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Open tubing clamp of syringe at lever.
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Pull back on the plunger to create a vacuum, then push the plunger down.
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Pull the brake lever slightly and allow it to snap back to help purge any bubbles remaining in lever body.
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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.
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Remove the syringe and install the bleed port screw.
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Clean up any spilled fluid with alcohol or soapy water.
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Pull the brake lever to bring the pistons to the rotor.
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Lever should feel firm when pulled with force.
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Repeat bleed if necessary.
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Empty the syringes into an appropriate container and store them with their clamps open.
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.