I remember reading an old aticle several years ago, l believe it was in Mopar Muscle. They talked about using the big rotor off a 76 Cop car on a 73 or newer A-body spindle. The best that recall it retained the 73 calipers and some type of factory mount bracket. Has anyone heard of this swap? My 65 already has the 73+ brakes so this be an easy ugrade for me.
11.75" Cop Car Brake Swap
- Thread starter Valkman
- Start date
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If you already have 73+ disk brakes on your car, all you need is the caliper brackets for the 11.75" rotors and the rotors themselves. Calipers are the same and can be reused. As mentioned, Cass sells the 11.75" caliper brackets for $100 now. Too easy! I had to find mine!
Great upgrade though, much better stopping power and still all off the shelf stock parts. Only other thing to consider is that you need to have 15" rims to clear the 11.75" brakes.
Great upgrade though, much better stopping power and still all off the shelf stock parts. Only other thing to consider is that you need to have 15" rims to clear the 11.75" brakes.
Are you using stock rear drums if so did you have to adjust for bias front to rear?
I also remember reading that the interceptor rotors were a special one piece design. Would anyone happen to know the Mopar PN for these?
C130 Chief
Mechanical Genius
Here's a little light reading: http://www.moparaction.com/Tech/archive/disc-main.html
BTW all 73-up rotors are unicast (one piece) regardless of size.
BTW all 73-up rotors are unicast (one piece) regardless of size.
Thanks for the link!
And yes they are all one piece but I was interested inthe special cop rotors that are reinforced.
On my Challenger I have 11x2.5" rear drums, no bias adjustment. On my Duster I have the stock 10x2.5" drums, again no bias adjustment. I think the Challenger is a touch better balanced F/R with the brakes than the Duster is at the moment, but there's no reason you HAVE to do anything other than the stock bias with the 10x2.5's. Most of the mopars of the era were biased too much toward the back anyway, so the larger brakes up front actually helps to correct that.
Now, if you've got 9" drums out back, or the 10x1.75's, you may want to put in an adjuster. Still, you'll be better off with a little bit of front bias than you were with a rear bias like most cars were from the factory.
As far as the rotors, I don't have anything for the "cop" rotors, and I would guess that even if they are out there they'd be hard to source. Summit does sell drilled and vented 11 3/4" rotors for a pretty nice price though.
Right
http://www.summitracing.com/parts/sum-br-63009r/overview/make/dodge
and Left
http://www.summitracing.com/parts/sum-br-63009l/overview/make/dodge
Robbie2734
Lambcharger
I did the upgrade, here's some pics I took. The first is the original 74 disk on the car, then the old and new side by side and the new on the car. The last is the larger bracket you'll need. Anybody need rotors and brackets for a 74 11 inch disk brake conversion?
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