Fixed calipers may have more potential leak points than floating calipers.

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The main idea is that a brake caliper’s leak potential grows with the number of hydraulic seal interfaces it contains. A fixed caliper sits rigid on the vehicle and usually houses pistons on both sides of the rotor. Each piston needs its own seal (and dust boot), so there are multiple seal interfaces where hydraulic fluid could leak. In contrast, a floating caliper relies on a sliding mounting and typically uses fewer piston-seal interfaces, with the main hydraulic pressure acting through a single bore on one side. That means fewer places for fluid to escape past seals. Since fixed calipers have more piston seals and related interfaces, they present more potential leak points than floating calipers.