New 8" Dual Diaphragm Zinc Plated power brake booster kit with 4 wheel disc proportioning valve. This 8" power booster is hand polished before a zinc plated finish is applied for a top quality finish. The black powder coated mount and pushrod assembly is a direct fit to your factory firewall for that fresh factory look. Also Included in this kit is a new 1-1/8" bore master cylinder perfect for most 4 wheel disc brake applications.