Update:
So it take a little bit of creativity and it helps to be able to ask my local Human Mopar Encyclopedia and others but, it can be done.
Here is the recipe I came up with.
Your mileage may vary... Not a "How To" just a "How I did it"...
1) 73 up A-Body disc brake spindle
2) 73 C-Body 11.75" diameter, 1.25" thick Rotors (.270" per side narrower track, moves the wheels .270" inboard per side)
3) Large Pin On, 2.75" piston Cordoba/New Yorker style Caliper
4) Slightly Modified Pin-On Style Caliper Brackets for the above Calipers (Clearanced to clear the rotors sitting deeper)
5) The Key to making all this work together! Chromoly Outer Bearing Adapters from Doctor Diff (Not listed on his Website). The adapter allows the bigger SET16 outer Bearing needed for the 73 C rotor. The inner Bearing is the same SET17 for all 73 up A/B/E/F/M/J/R and the 73 C-Body spindles...
6) Shave a little off the 2 inner Brake Pads... Made the inner pads closer to the same thickness as the outers.
Could have gone a couple ways with this but this way was fast and easy on my belt sander... Still lots of material left.
Inner Pads are now ~12.8mm-13mm (Sanded Down from ~14.5mm) and outers are unchanged at ~12.5mm total thickness.
Friction material thickness is about 7.8mm (inners), and ~7.5mm (outers) 5mm thick metal backing thickness inner and outers.
Right Front Looks like this assembled: Going to repaint the calipers Gloss Black.
Modified Caliper Bracket: Removed about an 1/8th of an inch of material from these locations.
Clearance gap:
I only ordered 1 73 C-Body rotor to start, in case I needed to return it. Second rotor is on it's way.
I tried another set of Pads to see if they might be thinner overall but they were not. Amazon Prime so free returns...
Interestingly, the Bendix set of pads were all 4 identical to each other, that is, all 4 were the same shape backing and same thickness...
Like these: Bendix, AC Delco and Raybestos, pictures all look like these... "¯\_(ツ)_/¯"
Centrix and DFC pictures look like these... as do the ones I using.
Not sure the brand of the ones I'm using since I've had them for years and not in the box...
The outers (Bottom) will fit in the inner position but the inners (Top) will only fit the inner location.
All this is helping with fitting Year One 17x8 wheels with 245/45-17 Tires on the front of a 69 Barracuda without trimming the lower front corners of the front fenders...
Pic of "Before" modified for 73 C Rotors. turning lock to lock, the tire would just hit the lower front corner of the fenders.
Was a "No Go"...
Those are 275/40-17x9" on the Rear and 245/45-17x8" on the Front.
Year One Cast Mopar style Rallye Wheels. Powder coated matte black. will run the Dark Argent 71 style Center Caps.
Gaining .270" BS while upgrading to the beefier 73C rotors combined with removing .300" off of the wheels mounting surfaces will net me .57" additional Backspace which may be enough to clear the lower front corner of the fenders when turning full lock and reversing...
Not quite there but will pick up my wheels from the machine shop today, minus .300" shaved off the mounting faces.
Lots of material to work with on the backs of these. There is about a 1.5" diameter 4mm deep "dish" around each stud hole, so only going about 3.5mm past flush with the back of the stud holes... if you get what I'm saying... Not sure why that "relief" is there but it is certainly not needed for bolting up to a perfectly flat rotor mounting surface.
Flat Black Year One Rallye Wheel next to an original Silver/Machined Aluminum.
This was a Plasti-Dip test before powder coating.
Will update again after I am able to test fit with tires...
- Randy D.
