Booster assy pin. W/O 2.0 LITER PHEV. A threaded rod which is used along with a nut to provide clamping force to help secure the ABS Hydraulic Control Unit to it's mounting point. Part cannot be reused/reinstalled. Power Brake Booster Pin. control unit. Hydraulic Assembly Stud. CLEVIS. Master CYLINDER ASSEMBLY. Power Brake.