Pirate Jack 1968–1982 Corvette 9" Dual Power Brake Booster with Wilwood 260-8556-BK Master Cylinder | 1-1/8" Bore Black Aluminum Tandem

Pirate Jack 1968–1982 Corvette 9" Dual Power Brake Booster with Wilwood 260-8556-BK Master Cylinder | 1-1/8" Bore Black Aluminum Tandem, OE fit meets Wilwood performance.

This kit pairs a true OE replacement 9" dual diaphragm power brake booster for the C3 Corvette with a genuine Wilwood 260-8556-BK high volume aluminum tandem master cylinder. You get factory-correct fit at the firewall and pedal, plus the lighter weight, higher fluid capacity and clean black finish Wilwood is known for.

A true OE replacement booster, not a generic one
Our PB9512CN is a brand-new 9" dual diaphragm power brake booster built as a true OE replacement for 1968–1982 Corvettes. It comes with the correct rod end that connects directly to your Corvette’s brake pedal, so it installs the way the factory intended, with no adapters or modifications needed. The dual diaphragm design delivers strong, consistent assist in a compact 9" package.

Genuine Wilwood 260-8556-BK master cylinder
The Wilwood 260-8556-BK is a high volume tandem master cylinder machined from high-pressure aluminum die castings and finished in durable black E-coat. Its 1-1/8" bore is designed for power-assisted brake systems, which makes it a natural match for a vacuum booster. At about 3 lbs, it’s roughly 75% lighter than most cast iron OE-style master cylinders, according to Wilwood.

Wilwood 260-8556-BK Specifications

• Wilwood part number: 260-8556-BK
• Bore: 1-1/8"
• Construction: aluminum, machined from high-pressure die castings
• Finish: black E-coat
• Stroke: 1.10"
• Primary-to-secondary volume ratio: 2:1
• Integral reservoir capacity: 8.0 oz / 4.8 oz
• Tandem outlets on both sides of the bore
• Outlet 1: 1/2"-20, fits 3/8"-24 IF or 1/2"-20 IF lines
• Outlet 2: 1/2"-20, fits 3/8"-24 IF or 9/16"-18 IF lines
• Mounting flange fits 3.22" to 3.40" bolt spacing
• Overall length: 8.76"
• Weight: approximately 3 lbs

What’s Included

• PB9512CN 9" dual diaphragm power brake booster: true OE replacement with the correct Corvette pedal rod end, black finish, brand new (not rebuilt)
• Wilwood 260-8556-BK high volume tandem master cylinder: 1-1/8" bore, black E-coat aluminum

Why Buy This Kit

• ✔ True OE replacement booster with the correct rod end for the Corvette brake pedal
• ✔ Genuine Wilwood 260-8556-BK master cylinder, not a look-alike
• ✔ 1-1/8" bore, designed for power brake systems
• ✔ Lightweight aluminum, about 75% lighter than cast iron
• ✔ High volume reservoir with a 2:1 primary-to-secondary ratio
• ✔ Clean, matching black finish under the hood
• ✔ Brand-new components, not remanufactured

Fitment

• 1968–1982 Chevrolet Corvette (C3)

Installation tip: Before final installation, check the booster pushrod length against the Wilwood master cylinder bore depth. Correct pushrod adjustment makes sure the brakes release fully and the pedal feels right.

Questions? Give us a call! The Pirate Jack team knows Corvette brakes and is happy to help confirm fitment before you order. Call us at 866-601-4455.

Factory fit, Wilwood performance. Order your Corvette booster and Wilwood master cylinder kit from Pirate Jack today.