New 8 Inch Dual Diaphragm direct fit power brake booster & master cylinder combo. This top-quality 8 inch dual diaphragm brake booster and master cylinder kit is designed mount directly to your factory firewall. This 8 inch dual diaphragm brake booster and master cylinder kit works great as a factory replacement or as an upgrade from manual to power brakes for vehicles with automatic or manual transmissions. Included in this 8 inch dual diaphragm brake booster and master cylinder kit is a new factory style 1" bore master cylinder equipped to work with front disc rear drum or 4 wheel disc brake applications. Note: If switching from manual to power brakes a power brake pedal is required.