New 8" Dual Diaphragm zinc plated power brake booster, master cylinder & adjustable proportioning valve combo. This 8" power booster is hand polished before a yellow zinc finish is applied for a top quality finish. The top quality power brake booster is designed mount directly to your factory firewall. Also included in this kits is a new 1" bore master cylinder and adjustable combination valve equipped to work with 4 wheel drum applications.