Upgrading to 11.75” discs on the front?
Thanks for the replies guys, much appreciated. Is the 15/16 master worth the hassel of swaping it out? My 1-1/32 master feels good to me, not sure what size pistons my calipers are, i will deff plan on changing the brake fluid, i was also thinking about using braided hoses on the front? Also is there any benefit in going from the single piston to 4 piston wilwoods
I think it's worth swapping the master cylinder to 15/16", I've swapped both my Duster and my Challenger over. But if you're happy with the pedal feel on the 1-1/32" then you can leave it alone.
I'd check the piston diameter as well, if you have the 2.6" pistons going to the 2.75's is also a nice upgrade. If you go from the 10.95" rotors to 11.75's with 2.75" pistons it will be a nice upgrade in braking.
Braided hoses are nice, they have a little less flex in them so you get a little stiffer pedal if you do it all the way around. Plus the quality of the plain rubber hoses has taken a nosedive, seems like they don't last very long at all anymore. The braided hoses tend to be a higher quality. That's the reason I use them, they hold up better than the rubber hoses.
So, the 4 piston wilwoods are a fixed caliper. If you run the clamping force numbers compared to a set of 2.75" piston stock calipers you actually find that, in theory anyway, the factory calipers have a higher clamp force. But, because they're a single piston floating caliper you get more losses than a fixed 4 piston caliper would have. The factory calipers are less efficient because they can flex more, get hung up on the sliding mechanisms, etc. so even though the math shows a higher clamp force the actual force transmitted to the rotors might be lower. You would also likely have some better brake pad choices with the wilwoods. And the wilwoods are aluminum, so they're lighter. But it really depends on a lot of things. For a street car I would have no problems running the factory 2.75" calipers, they work well. As I said, I did like 70k miles in my Challenger with a set of 11.75" rotors and factory calipers, they work really well. The wilwood calipers might work better, but for the price tag (an extra $750) I'm not sure they're worth it. Like I said before, if I was going that far I'd probably just go to the 13" rotor brake kits, although they take larger diameter wheels.
Also is the offset on the hub on the 73’ a body 11” rotors the same as the 78 cordoba 11.75” rotors?
Yes
is the hub register the same diameter as well?
It should be. Comparing between different manufacturer's, brands etc it might be a
little different. But the specs are the same so any differences would be in the production of that particular set of rotors, basically they shouldn't be different by more than production tolerances.