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This Vehicle-Specific AR4 Rear Big Brake Kit is the back half of a complete brake system for Tundra XK50 and Sequoia XK60, built to work with a front BBK and bring the rear axle back into the game.
With a crew cab full of people, a bed full of gear, or a trailer on the hitch, a front-only big brake kit can make the truck or SUV dive hard and feel light and nervous at the rear. This 4-piston forged caliper and 365 mm high-carbon rotor package is tuned to complement a strong front BBK, adding rear capacity so your Tundra or Sequoia stays flatter, calmer and easier to control on long grades, work days and family road trips.
These specs show how the rear kit is matched to the size, tow use and passenger load of Tundra XK50 and Sequoia XK60. The piston area is selected to restore proper brake bias with a front BBK, while the large rotor helps manage heat when the vehicle is fully loaded with people, cargo and a braked trailer.
| Caliper Engineering | |
|---|---|
| Series | Vehicle-Specific Series |
| Application | AR4 – Toyota Tundra (XK50) & Sequoia (XK60) |
| Mounting Position | Rear Axle |
| Piston Count | 4-Piston, Staggered |
| Piston Type | 2-Piece Vented with Dust Boots |
| Piston Diameter | 30 mm / 34 mm (1.18 in / 1.34 in) |
| Total Piston Area | 32.28 cm² (5.00 in²) |
| Construction | 2-Piece Forged Aluminum Alloy |
| Net Weight | 3.20 kg (7.05 lbs) (Single Caliper, No Pads) |
| Finish | High-Temperature Gloss Coating |
| Min. Wheel Size | 17" Recommended |
| Rotor Specification | |
| Material | High-Carbon Steel |
| Dimensions | ⌀365 mm (14.37 in) × 28 mm (1.10 in) thick |
| Construction | 1-Piece Vented |
| Surface Patterns | Curved Slotted |
| Brake Pad Compound | |
| Compound Model | M-01 Street Performance |
| Operating Temp | Up to 600°C (1112°F) |
| Friction Coefficient | 0.38 μ |
| Supporting Hardware (Vehicle-Specific) | |
| Brake Hoses | 3-Layer Stainless Steel Braided (PTFE Core, SUS304 Braid, PVC Sheath), Tundra XK50 & Sequoia XK60-specific lengths and fittings |
Confirm your Tundra XK50 or Sequoia XK60 is running 17" or larger wheels.
Measure from the rotor mounting face to the back of the wheel spokes. You need at least 100 mm (3.94 in) of clearance.
Please use the vehicle filter or contact us with your Tundra/Sequoia year, engine and trim to confirm the correct rear kit and pad option.
Want a printable fitment template? Contact us with your vehicle's year, make, and model, and we'll email you a 1:1 wheel-clearance template.
Yes, this is a complete, vehicle-specific rear big brake kit. Each kit includes:
See how Tundra and Sequoia owners complete their brake upgrades for towing, work and family road trips. Real trucks, real SUVs, real results.
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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