Reservoir pin. 2017-19. A screw that is used to secure the Brake Master Cylinder Reservoir to it’s mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Brake Master Cylinder to it’s mounting point. FROM 03/19/2018 TRW, SEDAN. FROM 12/11/2017. Pin to hold Brake Master Cylinder in place. Secures the master cylinder reservoir to the master cylinder. TO 03/19/2018 TRW, SEDAN. TO 12/10/2017. Vendor:TRW. W/GLI. W/O E-GOLF. W/O GLI. W/o RS 5. W/RS 5. Bolt. Pin. stud. Included with: Master cylinder.