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Alcon 4-Piston Rear Brake Kit for 2007-2018 Jeep Wrangler JK and 2018-2023 Jeep Wrangler JL
The Alcon ALCALABKR5059D12 rear brake kit upgrades the 2007-2018 Jeep Wrangler JK and 2018-2023 Jeep Wrangler JL with 330x22mm rotors and 4-piston red calipers. This kit includes new brake lines and is designed to complement an Alcon front big brake kit or run on its own for a stronger, more consistent rear brake bias.
Key Features
- ALCALABKR5059D12 4-piston red rear calipers
- 330x22mm rotors for increased thermal capacity
- Includes new brake lines for a complete rear axle installation
- Up to 30 percent reduction in disc temperature rise versus stock
- Up to 26 percent reduction in pad work rate
- Up to 25 percent reduction in pedal effort
Fitment Table
| Year Range | Make | Model | Trim |
|---|---|---|---|
| 2007-2018 | Jeep | Wrangler | JK |
| 2018-2023 | Jeep | Wrangler | JL |
Specifications
| Detail | Value |
|---|---|
| Rotor Diameter | 330mm |
| Rotor Thickness | 22mm |
| Piston Count | 4 per caliper |
| Caliper Color | Red |
| Caliper Material | Forged aluminum |
| Brake Lines | Included |
What's Included
- Two ALCALABKR5059D12 4-piston rear calipers
- Two 330x22mm rotors
- Mounting brackets and hardware
- Brake lines and pre-loaded performance pads
About Alcon
Alcon is a motorsports brake manufacturer with decades of experience supplying calipers and rotors to professional racing teams worldwide. Alcon applies that engineering background to Jeep Wrangler brake kits built for trail abuse and repeated hard stops.
Related Parts
- ALCALABKF5459AX02 Front Brake Upgrade Kit for Jeep Wrangler JK
- ALCALAPNS4450X703.4 Rear Brake Pad Set for Jeep JK
FAQ
What is the ALCALABKR5059D12?The ALCALABKR5059D12 is an Alcon 4-piston rear brake kit with 330x22mm rotors for the Jeep Wrangler JK and JL.
Does this brake kit include brake lines?Yes, this kit includes new brake lines for a complete rear installation.
Does this brake kit fit the JL Wrangler?Yes, this kit fits the 2007-2018 Jeep Wrangler JK and the 2018-2023 Jeep Wrangler JL.
What rotor size does this brake kit use?This kit uses 330mm diameter rotors that are 22mm thick.
How many pistons does this brake kit's caliper have?Each caliper uses 4 pistons.
Can this brake kit be paired with a front brake kit?Yes, this rear kit pairs well with the Alcon front big brake kit for full axle coverage.
Does this brake kit come with brake pads?Yes, this kit includes performance brake pads pre-loaded into the calipers.
Is this brake kit compatible with the factory parking brake?Yes, this kit is designed to retain functional use of the factory parking brake system.
Install Instructions
- Apply the parking brake and raise the vehicle on a lift or axle stands.
- Remove the rear wheels and disconnect the brake hose from the hard line.
- Remove the factory rear caliper and brake disc.
- Fit the new caliper mounting bracket to the axle using the factory bolts.
- Install the new ALCALABKR5059D12 rotor onto the hub.
- Position the caliper over the rotor and secure it to the bracket with the bleed screw uppermost.
- Connect the included brake line to the caliper and torque the banjo bolt to specification.
- Bleed the brake system with DOT 4 fluid and check for leaks.
- Torque the wheels to factory specification and bed in the new brakes with gradual stops.
Alcon
Shop Alcon brake systems, big brake kits, brake calipers, brake rotors, brake pads, rotor rings, bracket kits, caliper rebuild kits, pad retainer kits, brake hardware, and motorsport braking components at Black Ops Auto Works. Alcon is a race-proven braking brand known for high-performance brake systems used in motorsport, track day, street performance, off-road, truck, SUV, and high-demand braking applications. Whether you are upgrading a Ford F-150, Ford Raptor, Ford Ranger, Ford Bronco, RAM TRX, Jeep Wrangler JK, Jeep Wrangler JL, Jeep Gladiator, Toyota Tundra, Toyota Land Cruiser, Nissan GT-R R35, Chevrolet Corvette C5, C6, C8, BMW M3, BMW F8X, Audi MQB, Honda S2000, Mazda Miata, or performance race build, this Alcon collection helps you find premium brake upgrades designed for stronger stopping power, improved pedal feel, better heat management, and more consistent braking control. Shop Alcon Brake Parts by Category Browse Alcon braking upgrades across popular performance brake...
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