A U Cup Seal is used to provide a tight and secure seal around the piston, preventing the loss of hydraulic fluid and ensuring that the brake remains engaged. It is made up of rubber and provides a positive seal between the sealing surfaces and prevents fluid leakage.Attributes:• Machined precisely to the correct dimensions and tolerances to give improved durability• Offers high durability and flexibilityApplications:A U Cup Seal allows it to conform to the shape of the piston, creating a tight seal that is resistant to leaks and contamination and fits tightly around the piston.