Why is the air in motorcycle radial calipers always difficult to completely bleed?

1 Answers
McTimothy
07/30/25 10:10am
Incomplete air bleeding indicates either an issue with the brake fluid or incorrect bleeding method. It is recommended to replace the brake fluid. Correct method: The proper procedure is to loosen the caliper bleeder screw while covering the screw hole with a finger, then continuously operate the master cylinder brake lever until no air bubbles emerge, finally tightening the bleeder screw. For newly replaced brakes, repeated braking is necessary: Firmly pull the front brake lever repeatedly, then while holding the lever, loosen the bleeder screw to release air before tightening the screw and releasing the lever. Newly replaced brake calipers require multiple bleeding cycles. After air removal, if the fluid level drops, additional brake fluid should be added.
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