65-66 Mustang Power Brake Upgrade with All Wheel Disc Brakes

The Power Brake Upgrade Kit for a 1965-1966 Mustang with All-Wheel Disc Brakes is designed to enhance braking performance by replacing the factory braking components with modern, more efficient parts. The upgrade features a Fox body booster paired with a 1" bore master cylinder specifically intended for all-wheel disc brakes.

Key Features:

1. Revised Pedal Ratio: Offers less pedal travel (around 2" with front discs, 1" with all-wheel discs) and a more modern braking feel.

2. Additional Firewall Bracing: Prevents firewall fatigue by welding to the pedal support, strengthening the booster mount area.

3. 9" Diameter Booster: A larger, more durable Fox Mustang booster that won’t fade after repeated stops, ensuring long-term performance with easily available replacement parts.

4. Factory Fit and Appearance: Fits better than the original '65-66 booster, providing improved functionality without compromising the classic look.

5. Dual Bowl Master Cylinder: Unlike the original, the kit allows for dual bowl master cylinders without clearance issues.

Kit Requirements and Compatibility:

• Pedal Modification: You need to modify the pedal support and stock brake pedal. 

• Adjustable Proportioning Valve: Must be purchased separately for proper brake balance with disc brakes.

• Transmission Compatibility: Works with both manual (clutch cable conversion) and automatic transmissions. Will not work with factory z-bar setup.

• Firewall Template: Provided for easier installation. 

Additional Notes:

• Compatibility with Other Vehicles: The kit can be adapted to other models like Falcon and Ranchero, though additional work is required.

• Clearing the Shock Tower and Export Brace: The booster fits without issues, in most cases, though some older Falcons and Comets may require a Shelby-style export brace for dual-bowl master cylinders.

• Clearance with 351W and Heddman Headers: The kit clears short tube headers easily, although the header MAY need to be removed during installation.

• Clutch Actuation Issues: If you have an original toploader transmission with the factory z-bar setup, the clutch actuation rod will interfere with the booster stud placement. However, a T5 or TKX transmission with a cable-actuated clutch will work fine.

Conclusion:
This upgrade kit provides a modernized braking system with improved pedal feel, reliability, and long-term durability for 1965-1966 Mustangs, and it can be adapted for use in a variety of other classic Ford models with some additional work.