You are looking at the hydraulic power brake booster and Power Steering pump from an 87 Chevy 1 ton truck with big block 454. This setup powers the power brake system through the P/S pump. Lines go from the P/S pump to this booster, then exit to the steering box. Being offered for parts because the cup on the back of the cylinder that the brake pedal rod goes into is chipped (pictured). Correct for 73 to 87 Chevy and GMC 3500 series trucks BUT, could be modified for use to create a compact P/B system on anything. The pump & brackets are unique to big block. Worked fine when truck was parked this past summer. Comes as shown.