The CARQUEST MCA390321 Brake Master Cylinder is a high-quality car part designed for efficient braking systems. Made of durable gray aluminum with a 1.25" bore diameter, this brake master cylinder is reliable for vehicles in need of a replacement part. The inclusion of a reservoir adds an extra layer of functionality to ensure smooth and effective braking performance on the road. With the trusted brand of Carquest and specific manufacturer part number, this brake master cylinder is a dependable choice for maintaining vehicle safety and control.