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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
| Years | Make | Model | Submodel / Notes |
|---|---|---|---|
| 2007-2018 | Jeep | Wrangler | JK |
| 2018-2023 | Jeep | Wrangler | JL |
Specifications
| Brand | Alcon |
|---|---|
| Manufacturer Part Number | ALABKR5059D12 |
| Product Type | Big Brake Kits |
| Condition | New |
| 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 engineers performance brake systems and service components for road, off-road, motorsport, defense, and specialized vehicle applications. Exact caliper, rotor, pad, hardware, fitment, and clearance requirements vary by part number.
Related Parts
- Alcon 2007+ Jeep JK 350x32mm Rotors 4-Piston Red Calipers Front Brake Upgrade Kit
- Alcon 2007+ Jeep JK CIR50 AV1 Brake Pad Set - Rear
- Shop the complete Alcon collection
Frequently Asked Questions
Will Alcon ALABKR5059D12 fit my vehicle?
This kit is listed for 2007-2018 Jeep Wrangler JK, 2018-2023 Jeep Wrangler JL. Confirm the complete trim, factory brake package, hub and knuckle configuration, and every application note before ordering.
What is included with Alcon ALABKR5059D12?
The verified package includes Two ALCALABKR5059D12 4-piston rear calipers; Two 330x22mm rotors; Mounting brackets and hardware; Brake lines and pre-loaded performance pads. Only components explicitly listed for this exact part number are included.
Which axle does this Alcon brake kit upgrade?
This configuration is for the axle position stated in the product title and specifications. Do not substitute a front, rear, or complete-vehicle kit with a similar rotor diameter.
Will my current wheels clear this Alcon brake kit?
Wheel diameter alone does not establish clearance. Verify spoke profile, barrel diameter, offset, caliper envelope, rotor size, and the current Alcon wheel-clearance template before ordering.
Does an Alcon big brake kit require bleeding and bedding?
Hydraulic brake work requires correct installation, bleeding, leak inspection, torque verification, and the pad and rotor bedding procedure supplied for the exact components. Professional installation is recommended when the installer is not qualified for brake-system service.
Installation 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.
Important Disclosures
- California Proposition 65 warning: this product can expose you to chemicals known to the State of California to cause cancer and reproductive harm.
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