Where is the square cut seal typically located in disc brake caliper assemblies?

The square cut seal is typically located in the caliper piston bore as its primary function is to ensure a proper seal between the piston and the bore. This seal plays a critical role in maintaining hydraulic pressure within the braking system. When the brake pedal is pressed, brake fluid enters the caliper, forcing the piston outward to apply pressure on the brake pads against the rotor. The square cut seal helps to prevent brake fluid from leaking out and allows for the effective transfer of the force generated by the piston, thereby enhancing braking performance and ensuring that the system remains sealed and responsive.

The design of the square cut seal allows it to grip the bore tightly and ensure that any pressure increase within the caliper does not result in a loss of fluid or performance. Its placement in the piston bore is essential for the caliper's operation, as it directly influences how effectively the brakes engage and disengage.