If square rings perform poorly in dynamic sealing envirionments why do many brake calipers use them?

Thank you for your question. I was referring to lathe cut seals as being a poor choice for a dynamic seal because they lack the formed edges and surface smoothness required for dynamic applications. The pistons in brake calipers do move and as such can be considered dynamic, but they are not typical of dynamic sealing applications.

Most applications have more piston travel; such as the hydraulic cylinders on a garbage truck that has a very high duty cycle, compared to the minimal amount of piston movement in a caliper, usually less than an inch over the entire life of the brake pads.

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