This repair kit contains the seals and components needed to rebuild a brake cylinder on a self-propelled harvesting machine. It sits within the brake system, restoring the cylinder's ability to apply and release the brake pads against the disc or drum. A leaking or seized brake cylinder causes reduced braking force and uneven stopping, which can lead to safety issues during road transport or field operation. The kit is manufactured to match the original cylinder's internal dimensions so that the piston seal and wiper function correctly without modification. On installation, clean the cylinder bore thoroughly and lubricate the new seals with brake fluid before assembly.