DR. DIFF 11.25 rear Disc Brake Kit

jbc426 said

What are you using up front to match these big rear brakes? Maybe 13" with Viper Calipers or something massive like that?

All the Mopars I have ever owned tend to lock up the rears way before the fronts break loose. I've had to use smaller rear wheel cylinders on the rears to "calm" them down before switching to small rear discs like Dr Diff's Econo rear brake kit in combination with the Mopar Police Taxi front brakes with Firm Feel pads. That combination is nearly perfectly balanced on both My A-Body and E-Body. No additional proportioning valve needed.

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It really depends on your car. I run DoctorDiff's 13" cobra brakes up front with the 11.7's out back, they're very well balanced. I only use a very small amount of adjustment on my adjustable prop valve, it's almost wide open.

But I also run a stagger, 275's in the front and 295's out back. And if your car has some rake to it you'd also need to dial the rear brakes back as you're loading the front even more. The brake bias needed can be pretty different car to car depending on the suspension and tire set up.

I haven't looked into the caliper set up on the 11.25's, so the other thing to keep in mind is that just because the rotor is a little bigger doesn't necessarily mean there's more braking force. If the caliper has a smaller piston bore it could be pretty similar to the 10.7's.