I'm currently running the 11.75 tall brake Cordoba setup on my 70 Coronet. Is there a bigger setup out (rotors, calipers, etc) there that will fit under 15" wheels.

I have 15" Magnum 500 wheels 245/60R15 tires

The factory style Magnums may be the biggest limiting factor that keeps you locked into 11.75" units.

There are Wilwood 12.19 kits out there that are used by many of the stock car racers, who are limited to 15" wheels. But that is no guarantee of fitment with OEM wheels, especially if your Magnums are original or where drum brake wheels, as racing wheels typically have more inside diameter clearance than OEM wheels

You can put Viper or Wilwood calipers on the Corboda rotors to get some additional pedal feedback and increased pad choice, but it won't increase your braking leverage at all.

Thanks for the reply...My magnums are aftermarket 15x7 I think I got them from Wheel Vintiques.

There are still a few better brake pads available.
I upgraded from Hawk HPS to EPS Yellow Stuff brake pads on my daily Dart with 11.75" C-body rotors and pin-style calipers.

I've heard (from a particular source) that the C-body cast iron factory calipers give greater clamping force, thus better potential stopping power, as compared to aftermarket aluminum calipers (ie: Wilwood in particular). This pertains to the 11.75 factory C-body rotor swap. Anyone here ever try different calipers with the 11.75 rotors... and could tell any noticeable difference (assuming similar type of pads)?

Eventually I'll swap to the 11.75 rotors so that I can still run my 15" vintage minilite rims (for street/hwy).

Could that be because the factory C-body single caliper has a 2.75" piston diameter, where as the aftermarket multi-piston calipers all have smaller (combined) diameters?

I haven't seen or used anything from Wilwood aside from their SL6 that works. The 11.75 with Viper 1st gen calipers, 10" ford discs in the rear and a hydroboost fit perfectly under 15" wheels and performs like a REAL car. Just my .02 from experience

BBM --- yes, the diameter of the pistons was the main issue that was said to be the differing factor.

I don't know how much it really makes any difference.... say from using the Wilwoods with the adapters avlbl from AREng'g.

Peter... I'd actually prefer to use the Viper calipers (thus, keeping it MOPAR), although they are apparently increasingly difficult to find. Also, they are rather large... concerns me IF they'd fit within my 15" cast aluminum minilite rims... wish I could eventually try them on someone's car who has them.

Its not a big hurry or high priority for me... will do eventually.

Mitch, I'm not sure if you are speaking from experience or not, as I've done this a couple times with excellent results. Not sure what you mean by difficult to find. Actually there are tons of them IF you know who to call. Beware that many 15" wheels have 14" centers with some type of double step outer hoop to accept a 15" tire. In that case you need a real 15" wheel.

First generation Viper calipers are common on eBay.

The calipers are, but what about the adapters? I thought the only ones still being produced are for drum spindles.

Best setup for 15 inch wheels would be a C body knuckle so you can run the thicker C body rotor. It takes work to get it on there but it can be done. I designed up a C body knuckle conversion for my car but I never installed it. The knuckle is extra tall so you need a new upper control arm.

The C body rotor is 1.25 inches thick so the Viper calipers fit without needing pad spacers. With some creative welding+ machine work the Viper calipers will bolt directly to the C body knuckles.

I mocked all of this stuff up a few years back but at the end of the day it was just a lot less work (and money) to swith over to 17 inch rims. The 17 inch rims allowed me to build a very easy 13 inch rotor kit with a ton of caliper choices. Sometimes you just have to take the easy path.

Do you still sell the kit? They've been out of stock on your website for as long as I can remember.

I've got a set of them sitting on my mill at the moment. I could be convinced to build another set. Or two. Or three.

There is some messy stuff going on here.

Brake pressure differs between calipers. However, a properly matched master cylinder will fix that problem.

Don't like the pressure with the Viper calipers? Get the properly sized master cylinder.
If you need to remove a 1/2" nut you don't reach for a 9/16" wrench. It won't work right. Instead, you use the proper size tool for the job. The same goes with the brakes.

The early C body (and pre-85 D150/B150) rotor is 1-1/4" thick. That's a good fit for the Viper caliper. Unfortunately, the outer wheel bearing is different. The inners are the same. A little searching might find you the proper outer bearing or a spindle liner to give you the extra .030" needed for a proper fit.

Keep in mind that the fixed calipers (like the Viper pieces) are VERY wide. So wide, in fact, that they can hit the back of the wheel before the wheel touches the hub. Careful measurements must be made.

The D150/B150/C-body calipers are the same. I do not know if they fit the pin brackets used on B-bodies. If so, that would be the cheapest effective brake package for the 15" wheels. The pads are the same so you need to look at the offset of the bracket itself.

Brakes turn kinetic energy into heat. Excessive heat kills brakes. The fatter brake rotors take longer to heat up and have a better chance of releasing the heat into the atmosphere. They're 5 lbs heavier than the B-body pieces. Much of that is in the braking surfaces. A high performance pad (assuming they are available) would work wonders. The pads are the same for the D150/B150/C-bodies.

The adapters to mount generation 1 Viper calipers to 73+ disk brake spindles on 11.75" rotors?

Viper calipers on B-body rotors will require a spacer behind the brake pads.
Viper calipers on C-body/D150/B150 rotors will require a different outer bearing. I haven't dug around to see if the bearing exists or if a spindle sleeve will be required.

Either set will require careful measuring to be sure the caliper will not contact the wheel.

I think Dr Diff bailed on this application due to low sales.



Building the parts isn't hard, it just takes a little time on manual machines. I've done more challenging conversions.

I've installed C-rotors on my '73 A-body spindles. I believe the outer bearing is the same on B-bodie spindles.
I made spindle bushings for the stock '73 C-rotor outer bearing to sit on.

The stock caliper brackets needed only 2 washers behind them to align the stock '73 C-body caliper to the rotor (Pin type).

I'm fairly sure the bracket for the Viper-calipers won't be that hard to align either.

The outer wheel bearing on a B-body has a .750" inside diameter.
The outer wheel bearing on a C-body has a .866" inside diameter.

Not a good mix for a steering axle.