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SSBC-USA Super Twin Disc Brake Kits
Super Twin - Front drum to disc brake conversion, includes new 2" drop spindles, , '64 - '72 GM "A-F"body
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Estimated Ship Date: Nov 18, 2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
A123-1ADS
Part Type:
Product Line:
Summit Racing Part Number:
TSB-A123-1ADS
Item Number:
6447401
UPC:
00810048991624
Location:
Front
Disc Brake Kit Type:
Power assist
Front Rotor Included:
Yes
Front Rotor Style:
Slotted surface
Front Rotor Construction:
Vented
Front Rotor Diameter:
11.00 in./279.40mm
Front Rotor Thickness (in.):
1.00 in.
Brake Rotor Bolt Pattern (in.):
5 x 4.75 in.
Brake Rotor Bolt Pattern (mm):
5 x 120.65mm
Rear Rotor Included:
No
Front Caliper Included:
Yes
Front Caliper Piston Quantity:
Two
Front Caliper Material:
Billet aluminum
Front Caliper Color:
Clearcoat
Rear Caliper Included:
No
Brake Pads Included:
Yes
Parking Brake Provision:
No
Minimum Recommended Wheel Diameter (in.):
15 in.
Front Spindles Included:
Yes
Spindle Type:
2 in. drop
Master Cylinder Included:
Yes
Brake Booster Included:
Yes
Remanufactured:
No
Brake Hoses Included:
Yes
Quantity:
Sold as a kit.
Notes:
Includes a single diaphragm 9 in. booster, master cylinder, pads, caliper mounting brackets, splash shields, adjustable proportioning valve, lines, seals, bearings, grease caps, braided stainless flex hoses, spindle nuts and hardware. Includes light weight Super Twin HD calipers.
SSBC-USA Super Twin Disc Brake Kits
Upgrade to better stopping power with SSBC-USA Super Twin disc brake kits. They feature lightweight, billet aluminum Super Twin 2-piston calipers—direct bolt-on replacements for many OEM applications—for better braking performance with less pad deflection. The calipers are clear anodized for added durability, but are also offered with a red or black powdercoat or polished finish. These brake kits include stainless flex lines, high performance pads, hardware, and CNC-machined turbo slotted rotors. Don't simply replace—upgrade to SSBC-USA Super Twin disc brake kits, available for a variety of applications from the 1960s and '70s.
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