1967-1969 Ford Mustang & Mercury Cougar Kelsey-Hayes 4-Piston Power Front Disc Brake Kit, Manual | A121-2.

Kelsey-Hayes Power Front Drum-to-Disc Brake Conversion Kit for Manual-Transmission Cars

Convert compatible 1967-1969 Ford Mustang and Mercury Cougar front drum brake systems with the SSBC-USA A121-2 Kelsey-Hayes-style power front disc brake conversion kit. This factory-inspired system combines 4-piston cast-iron calipers, 11.25-inch vented rotors, a 7-inch booster, dual-bowl master cylinder, and the major components needed for a properly matched manual-transmission conversion.

Key Features

• 4-piston Kelsey-Hayes-style front calipers
• Black E-coat caliper finish
• 11.25-inch vented front rotors
• 7-inch single-diaphragm power brake booster
• Manual-transmission application
• Bolts to compatible V8 or 6-cylinder drum brake spindles
• SSBC-USA part number: A121-2

What’s Included

• 4-piston cast-iron front calipers
• 11.25-inch vented front rotors
• Semi-metallic brake pads
• 7-inch single-diaphragm booster
• Dual-bowl master cylinder
• Power brake pedal
• Adjustable proportioning valve
• Splash shields
• DOT flex hoses
• Required installation hardware

Vehicle Fitment

Ford Mustang and Mercury Cougar: Select 1967-1969 manual-transmission applications with compatible drum brake spindles and a properly matched power-brake configuration.

✔ Fitment Confidence: This kit is designed for compatible manual-transmission Mustang and Cougar applications. Not 100% sure about your transmission, spindle type, lug pattern, pedal setup, wheel clearance, or current brake system? Call our tech team at (716) 775-6700 before you order. We’ll help confirm the correct application details so you can buy with confidence.

Important Compatibility Note

Six-cylinder applications may convert the front bolt pattern to 5 x 4.5 inches. Confirm transmission type, pedal assembly, firewall mounting pattern, spindle configuration, and available clearance before ordering.

Wheel and Installation Notes

Professional installation is recommended. Confirm spindle compatibility, wheel clearance, lug pattern, brake-line routing, booster and master-cylinder setup, pedal installation, and proportioning requirements before installation. The system must be properly bled and the pads and rotors correctly bedded after installation.

🚚 Shipping: This item is configured to order at our Elma, NY facility — production and configuration typically take 5–10 business days. Supply constraints can occasionally cause temporary delays beyond this window. Need an update on your order? Contact us at (716) 775-6700 or orders@ssbc-usa.com with your order number and we’ll get you an answer right away. Your exact shipping cost is calculated at checkout based on your address.