Street or Track 12x1.25"
'Trans-AM' Front Disk Brake System for DRUM spindles
Disc brake conversion kit for 1964-73
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
*You should check
with your rule book to confirm exact components allowed in class before
and use the wheel fitment template:
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.
customer's installation pictures on our Facebook page:
our product flier
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.
Calipers have had all the necessary machine work performed for a direct bolt
on installation. Finished in a high temperature silver powder coat.
2 x 12" x 1.25" 2-piece heavy duty rotors with 36 directional cooling vanes,
shipped bolted and safety wired to aluminum hats. Rotors are cast and
finish machined in the USA.
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.
ARP 3" long wheel studs
All kits are custom built to your exact specifications. If you are in a
rush, please contact us to confirm current build time
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!
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!
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 vanes aid in brake cooling
Shipped assembled and
Our 2-pc 12" rotor
with aluminum hat, hub and studs weighs 3lbs less than this
1-pc 11.25" 1970 rotor
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