New 9" zinc plated power brake booster & master cylinder combo. This 9" 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 power booster kit is a new 1-1/8" bore master cylinder and adjustable proportioning valve equipped to work with front disc / rear drum or 4 wheel disc brake applications.