What Causes the Rear Brake of a Scooter to Fail?

[JeffreyAnn]

Scooter rear brake failure is primarily caused by obvious oil contamination on the disc brake rotor and brake pads, as well as air entering the brake lines. Below are detailed explanations of the specific reasons: Obvious oil contamination on the disc brake rotor and brake pads: Oil forms a film between the disc brake rotor and brake pads, reducing the friction coefficient of the friction pair and leading to brake failure due to decreased braking force. Air entering the brake lines: This causes excessive pedal or lever travel, exceeding the maximum rotation angle, and fails to generate sufficient braking force. Air is highly compressible. Continuous high-intensity braking: This leads to "vapor lock" in the lines, causing brake failure. The principle of vapor lock-induced brake failure is the same as air entering the lines. "Vapor lock" occurs due to the high-temperature boiling of brake fluid.