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8 in Dual Chrome Firewall Booster & Master Cylinder, 1964-74 AFX

CPP high-performance automotive parts for classic cars
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Part #
6474BB24-8DC-LAC
Product Takes 7 Days to Ship
$469.00
1964-72 A-Body 1967-69 F-Body 1968-74 X-Body, 8 in Chrome Dual Diaphragm Firewall Brake Booster & 1.125 in Bore Flat Top Master Cylinder and Proportioning Valve, works for 2 and 4 Wheel Disc
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Prop 65 warning
The CPP Complete Power Brake Booster Kit (Part Number 6474BB24-8DC-LAC) features an 8" dual chrome-plated booster. Includes a flat top master cylinder and proportioning valve combo. Compatible with 64-72 A-Body, 67-69 F-Body, 68-74 X-Body. Suitable for 2 and 4 wheel disc systems.
More Information
Product Name 8 in Dual Chrome Firewall Booster & Master Cylinder, 1964-74 AFX SKU 6474BB24-8DC-LAC
Bleeder Kit Included Yes Brake Booster Diameter 8
Brake Booster Finish Chrome Brake Booster Type Dual Diaphragm
Master Cylinder Bore Size 1.125 Master Cylinder Finish Chrome
Master Cylinder Material Aluminum Master Cylinder Type Chrome Flat Top
Hardware Included Yes Works With 2 Wheel Disc Yes
Works With 4 Wheel Disc Yes Works With 4 Wheel Drum No
Proportioning Valve Type Side Mount Left Hand Proportioning Valve Included Yes
Brake Booster Kit Type Complete Booster Kits Master Cylinder Included Yes
Brake Pedal Extension Rod Included Yes Warranty Yes
Prop65 Yes Brand CPP
Brake Booster Mount Type Firewall Product Type Brake Boosters
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CPP Power Brake Kit Install Yields Plenty of Whoa Power

Many classic vehicles, including Tri-Five Chevys and pre-1967 cars and trucks, came equipped with single-reservoir master cylinders. While these served well for decades, a failure in any brake hose, wheel cylinder, or line could evacuate the entire system, compromising safety. Upgrading to a dual-reservoir, power-brake setup not only adds redundancy but also reduces pedal effort—an especially welcome change for weekend cruisers and street rods alike.

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CPBK Bleeder Kit Instructions
Master Cylinder Instructions
PVK instructions

This kit includes:

  1. Fixed

  2. P/N: 6474BB-C

    • Description: Chrome Brake Booster Brackets
    • Quantity: 1

  3. P/N: 6474BPR

    • Description: 4.875in Threaded Push Rod Male 3/8-24x3.0in Thread Female 3/8-24x1.25in Thread
    • Quantity: 1

  4. P/N: 8DSRB-C

    • Description: Universal Chrome Plated Power Brake Booster, 8in Dual
    • Quantity: 1

  5. P/N: M-C118LAC

    • Description: Chrome Aluminum Power Master Cylinder W/Flat Top Lid
    • Quantity: 1

  6. P/N: PVKS-C1

    • Description: Proportioning Valve W/Bracket & Lines Chrome Driver's Side, Firewall Mount,, 1/2x20 & 9/16x18 Ports
    • Quantity: 1

  7. P/N: 64012

    • Description: After Market Vacuum Booster Dust Cover
    • Quantity: 1

  8. P/N: H-BBK

    • Description: Basic Booster Install Kit
    • Quantity: 1

  9. P/N: TECH

    • Description: Brake Trouble Shooting Guide
    • Quantity: 1
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