Street or Track 12x1.25" 'Trans-AM' Front Disk Brake System for DRUM spindles
Disc brake conversion kit for 1964-73 Mustangs.

Pictures show system mounted to our optional Big Spindle (not included in this kit but highly recommended for serious track cars).

Using only premium components, this complete 'turn-key' vintage legal* kit is based on the Boss 302 Trans-Am racing brake system of the late 60's.  Using 12" x 1.25" rotors mounted to an aluminum hat this kit offers a great weight savings over the original version.  Giant Kelsey Hayes style 67-Tbird calipers provide excellent clamping power and utilize the popular D1 pad.  Our custom spindle bracket requires no modification to your DRUM spindles and enables the kit to fit the popular vintage legal* 15" American Racing Torq Thrust D wheels.

*You should check with your rule book to confirm exact components allowed in class before purchasing.

Please download and use the wheel fitment template:

Fits 65-73 Mustangs, Falcons and other Fords that used the same spindles.  Direct bolt on to 65-73 Mustang V8 OE drum spindles (65-67 any spindle, 68-73 drum version only).  Retains OE track width and enables use of 15x7 (or larger) vintage style & backspace wheels without spacers or modifications. 

Checkout real customer's installation pictures on our Facebook page:

Download our product flier

Kit includes:

  • 2 x 67-T-bird/Lincoln style 4 piston calipers complete with cross over tubes, stainless steel pad retention clips and your choice of Porterfield R4-S street pads or R4 Racing pads.

  • 2 x 12" x 1.25" 2-piece heavy duty rotors with 36 directional cooling vanes, shipped safety wired to aluminum hats.

  • 2 x Hubs fitted with bearing races and standard length wheel studs (so you can use closed end lug nuts).  3" long ARP studs and open ended lug nuts also available.

  • 2 x Hub centric adapter shims.

  • 2 x Billet steel spindle/caliper mounting brackets.  CAD designed, CNC machined and plated for corrosion protection.

  • 2 x Timken inner bearings.

  • 2 x Timken outer bearings.

  • 2 x Timken inner dust seals.

  • 2 x Stainless steel braided brake hoses complete with all adapters to connect to caliper and stock hard lines.

  • 2 x Castle nuts (70-73 spindles use nut and castle style nut retainer).

  • 2 x Cotter pins.

  • 2 x Dust caps.

  • Grade 8 bolts and all the hardware to install the kit.

Optional components:

  • ARP 3" long wheel studs

  • Big spindle kit

All kits are custom built to your exact specifications.  If you are in a rush, please contact us to confirm current build time

General Specifications:
Wheel Size Required: Fits many 15" & larger wheels
Axle: Front

 

Caliper Specifications:
Name: 67 T-bird/Lincoln
Type: Fixed
Number of Pistons: 4
Piston Size: 1.946"
Construction: Cast Iron
Pads: Porterfield R4-S

Ideal for high performance and heavy duty street conditions the Porterfield R4-S compound remains a top performer in the realm of street/performance brake pads. With the R4-S compound giving a friction level up to .41.  This is an amazingly fast stopping brake pad.  Simply put, they will give you an impressive increase in stopping ability with very minimum amount of pedal effort.  Perfect for prolonged everyday street driving while also being capable of enduring the most severe use without fade.  It is also very rotor friendly.  Not recommend for racetrack use!

Porterfield R-4

Designed specifically for heavy duty motorsports, the Porterfield R-4 brake pad is able to maintain an average friction level of .50 within a very wide temperature range.  Using the latest in ceramic technology, the carbon based semi-metallic R4 materials allow the pad to absorb tremendous amounts of heat and dissipate it at a very even rate, while at the same time insulating excessive heat from the calipers.  Another inherent characteristic is the carbon kevlar material warms up to race temperature very quickly.  Optimum R-4 operating temperatures are 450°F and above.  Throughout the entire heat range, the carbon kevlar material will give extremely consistent modulation and predictably smooth release characteristics up to threshold.  Not recommend for street use!
Finish: Durable high temperature silver powder coat.
Notes: Includes cross over tubes & stainless steel pad retention clips with grade 8 install hardware

 

Rotor Specifications:
Type: Heavy Duty 2 Piece mounted to CNC machined billet aluminum hat.  Shipped fully assembled and safety wired.
Diameter: 12"
Thickness: 1.25"
Venting: 36 Directionally vented vanes
Finish: Plain
Options: Stress Relieved (Heat Treated), Gas vent slots - Custom order.
Why use such a large rotor?  Well, simply put, heat.  The friction created by braking creates heat and the more and harder you brake the more heat is generated.  All that heat has to go somewhere and if the 'heat-sink' (rotor) gets so hot it can no longer absorb heat then the heat will migrate to other components.  These other components will include brake fluid and wheel bearings, not places you want increased heat.  The problem with large rotors is weight.  All that weight is unsprung which will affect suspension performance and increase stopping distances.

The rotor we use in this kit provides the best of both worlds.  Increased thermal mass due to its diameter and thickness yet lighter weight when mounted to an aluminum hat.  In fact, the rotor, aluminum hat, hub and stud combination used in this kit is 3lbs lighter than a standard 1970 Mustang rotor!  Additionally the increased width of this rotor allows the cooling vanes to be wider resulting in more airflow for cooling.

Directional cooling vanes aid in brake cooling

Shipped assembled and safety wired

Our 2-pc 12" rotor with aluminum hat, hub and studs weighs 3lbs less than this 1-pc 11.25" 1970 rotor

 

Caliper mounting brackets:

Meticulous attention to detail and advanced computer modeling techniques ensure perfect fit.  Our brackets are custom CAD designed, CNC machined from a single piece of billet steel, then plated for corrosion protection.

 

 

 

 

 
 

 

Additional Features:
Master Cylinder (optional): Aluminum construction with see-through reservoir - no need to remove cap to check fluid level.  Weighs under 2lbs!  Ports exit passenger side.  Includes bench bleeding kit, new hard lines and fittings.  1" bore is ideal for this brake system.