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This Direct-Mount Series AR4 rear big brake kit is built for the Toyota Land Cruiser Prado J150 and Lexus GX400/GX460 rear axle, adding rear brake capacity to support confident stopping on heavier SUV builds.
The system pairs a 4-piston forged aluminum rear caliper with a 345 mm × 28 mm internally vented one-piece rotor. Piston area, rotor sizing, brake-line fittings, and mounting architecture are specified for this vehicle application, helping the rear axle contribute more consistently during aggressive braking, added tire mass, cargo load, steep descents, or front brake upgrades.
Use the fitment checks below before ordering. Wheel diameter, spoke clearance, and exact vehicle application must all be confirmed; wheel size alone does not guarantee caliper clearance.
The specifications below are based on the matched TTSPORT Direct-Mount Series data for the Toyota Land Cruiser Prado J150 and Lexus GX400/GX460 rear application. Do not substitute generic rotor, piston, or clearance dimensions when checking fitment.
| Brake Caliper | |
|---|---|
| Series | Direct-Mount Series |
| Model / Application | AR4 |
| Axle Position | Rear |
| Piston Count | 4-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 30 mm × 2 / 34 mm × 2 |
| Caliper Dimensions | L 270 mm × W 162 mm × H 106 mm |
| Total Piston Area | 32.3 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.20 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø345 mm × 28 mm |
| Brake Rotors | |
| Rotor Material | Heat-treated high-carbon cast iron |
| Axle Position | Rear |
| Rotor Dimensions | Ø345 mm × 28 mm |
| Construction | One-piece rotor |
| Ventilation | Internally vented |
| Rotor Mounting | Fixed |
| Directional Design | Yes — left/right specific |
| Rotor Face Pattern | Curved slot |
| Brake Pads | |
| Compatible Rotor Material | Iron/steel rotors only |
| Operating Temperature Range | 0–600 °C |
| Average Friction Coefficient | Average μ: 0.38; variation depends on temperature, line pressure, and rotor condition |
| Stainless-Steel Braided Brake Lines | |
| Construction | Three-layer reinforced construction |
| Material | PTFE inner liner / SUS304 stainless-steel braid / PVC protective outer sheath |
| Fitment & Installation | |
| Vehicle Application | Toyota Land Cruiser Prado (J150) Lexus GX400 / GX460 |
| Minimum Spoke Clearance | 96 mm |
| Caliper Mounting Type | Direct mount |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
| Service Parts | |
| Bedding-In Procedure | Required |
Brake pads are specified for iron/steel rotors only. Proper installation, bleeding, torque procedures, and pad bedding are required before performance use.

Confirm your vehicle is running 17 in or larger wheels.

Measure caliper-to-spoke clearance using the wheel’s inside spoke profile. This kit requires at least 96 mm of spoke clearance.

Confirm the vehicle is a Toyota Land Cruiser Prado J150 or Lexus GX400/GX460 application before ordering.
Need a wheel-clearance template or application check? Contact us with your vehicle details, wheel specifications, and current brake setup.
This rear big brake kit is built around the matched TTSPORT AR4 rear system specification for the listed vehicles. The system configuration includes:
Confirm current package contents and any service-part needs at the time of ordering.
Review TTSPORT customer builds to see how our brake systems are used on real truck and SUV applications.
View Customer BuildsYou’re here because you’re passionate about your ride, and so are we. We want your TTSPORT brake upgrade to be a total win. Here’s some straight talk to make sure everything goes smoothly, from fitment to bedding in.
Look, we know you get it. Your brake kit is custom-made for your specific car. That means once it's built, it's yours. We can only accept returns if there’s a genuine quality defect from our side.
Sometimes, aftermarket wheels can be tricky. Depending on the design, you might need spacers for clearance. We’ll do our best to help you figure it out, but issues related to wheel spacers don't qualify for a return.
To get this right the first time, we need your help. Before you order, please give us the following info:
We’ll likely ask you to confirm some measurements and send a few photos of your wheels. Please double-check everything you send us. TTSPORT isn't responsible for fitment issues if the specs you provided were off.
We check every single part before it leaves our shop. When your kit arrives, give it a good look-over. If you spot any potential quality issues, let us know within 24 hours.
This is key to awesome performance. Don't skip it.
We build our kits to last, and we stand by our work. Here’s the breakdown:
Recommended Service Intervals:
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