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1964 - 1974 GM A, F, X Body Front Super Twin 2-piston Disc Brake Conversion Kit - A123-1A


Upgrade your GM A, F and X Body front brakes to aluminum caliper. Our billet aluminum calipers give you the stopping power of a 4-piston caliper without the wheel clearance issues.

Maximum braking power with the flexibility of using Most 15 inch wheels

  • Complete with master cylinder, forged spindles, pads, caliper mounting brackets, master cylinder lines, seals, wheel bearings, grease caps, DOT braided stainless flex hoses, spindle nuts and hardware.
  • Kit includes 2-piston SuperTwin HD billet aluminum calipers with stainless steel pistons, square cut seals, dust boots (DOT Design) and dual bleeders for easy bleeding.
  • Aluminum calipers are 6 lbs lighter than cast iron calipers for better ride quality.
  • 9" booster and power brake master cylinder power the light weight calipers.
  • Adjustable proportioning valve allow best performance for your rear brakes
  • Calipers and adjustable proportioning valve 100% MADE IN USA
  • Kit comes with Turbo slotted rotors with Xtra Life plating.
  • Optional Big Bite cross drilled and slotted rotors with Xtra Life plating

Please note that the calipers in this kit are coated with a clear anodize finish. Upgrade to red or black calipers for an additional cost.

Click here to download

REMINDER! Please do not purchase this kit without reviewing the wheel fitment diagram.
Pricing: $1,376.28

Customize Your Item

- Rotor Upgrades -
- Powder Coat Upgrade -


  • Caliper Name: SuperTwin
  • Number Of Pistons: 2
  • Piston Size: 43 mm
  • Constructed From: Billet Aluminum
  • Caliper Standard Finish: Clear Anodize
  • Caliper Optional Finishes: Powder Coat Red or black
  • Diameter: 11 in.
  • Thickness: 1.000 in.
  • Venting: Uni-Directional
  • Rotor Standard Finish: Slotted & Plated Optional cross drilled
  • Bolt Pattern: 5x4.75 in.

Replacement Parts

Fitment Notes

  • Will not fit most Pontiac factory wheels.


Shipping Information

  • Item Requires Shipping
  • 110.0 lbs.
  • W17.0000” x H13.0000” x L32.0000”

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