Snce 2011 I've run the TF BBK, originally with their upgrade master which is just the 2012 & newer stock unit. I got greatly improved stopping performance but rather long pedal travel. Last year I swapped in the Mopar BBK's master & booster kit and it's definitely the Guv'nor for firm pedal and increased stopping power. Adding one of the rear upgrade kits is probably a good idea if you're running 37"+. There's been a good running thread on the whole brake upgrade paths available. I started it here on the forum about three years ago, beginning with one of our club members who upgraded to the Mopar BR6 spec parts. A lot of twists & turns to get the parts, but she pulled it off. You can do just as well using TF's Big Rotor Kit. To get the rear brakes involved as well you can get TF's BRKs front & rear, or go for Dynatrac's kit, same thing. In both cases, and with the factorty BR6, the rotor(s) get an increase in diameter and then the caliper supports are extended. BR6 uses a different caliper, but it's essentially the same piston spec as the stock ones. To me the Mopar BBK, the whole enchilada with rotors, calipers, master & booster is the bargain of the lot and addresses the wimpy master cylinder & booster. The bigger you go in tire size & build weight the more the sketchy stock brakes become apparent.
'09 JKRU. 4" Teraflex long arm, Teraflex R44 housing, Teraflex / Fox Resis, Poly Performance skids, Nemesis Billy Rockers, Nemesis flares, 37" ATZ P3s on 17" 5x5.5" Trailready HDs, Spyntec hubs, Teraflex BBK, Mopar BBK master/booster, Superior front & Alloy USA rear axle shafts, CTMs, Reids, Synergy drag link & tie rod, WTOR hydro-boosted steering, 5.38s, TF Dual Rate front bar, TF bumpers, Warn Powerplant, Tom Woods shafts, AA xfer case cable, Kilby canister relo, RH4x4 cage.