The Power Stop K3090 is a rear-axle brake upgrade for the Jeep Wrangler JK, built on the brand's Z23 Evolution Sport formula. The carbon-fiber ceramic pads feature a low-dust formula, and the rotors are drilled & slotted for cooling and finished to resist rust. Buying the pads and rotors as one matched package spares you from pairing mismatched rear components yourself.
The case for this kit over stock is mainly value and everyday braking. The manufacturer presents it as the easy and affordable performance upgrade for a daily driver, and it adds braking power over the factory setup. Owners on user forums note that ceramic pads tend to run quieter than harder compounds, which matters on a Wrangler that already carries plenty of road and tire noise. Treat it as a street-focused upgrade rather than a track-grade brake system, since the drilled-and-slotted rotors are mainly about heat management.
The manufacturer calls for five moderate stops from 35 mph down to 5 mph, done back to back without letting the brakes cool. Afterward, drive for roughly five minutes at moderate speed without heating the brakes excessively, then use the brakes normally once they return to standard operating temperature. A resin smell during the process is expected.
Owners on user forums report that the rotor can catch on the parking brake shoes, and that rusted rotors may need a few taps with a mallet. Backing off the star adjuster on the drum side is the usual way to free the shoes before pulling the rotor.
Owners on user forums describe this as a manageable rear pad-and-rotor job for a home mechanic, with one owner calling it roughly an hour of work. You will need a jack, jack stands, and 13mm, 15mm, and 18mm sockets or wrenches. Replace the parking brake clips and washers, since user write-ups say they are not reusable. Lubricate the pad edges where they slide into the shims, and orient the shims as the install guides show. Replace the slide pin boots and regrease the pins. Check the rotor's stamped minimum thickness before reinstalling. Torque figures vary across user write-ups, so confirm the caliper bracket and caliper bolt specs in a service manual before you finish the job.
