Direct-Mount Rear Fitment
Vehicle-specific rear direct-mount configuration for Toyota Tundra (XK50) and Toyota Sequoia (XK60).
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Description
2007-2021 Toyota Tundra & 2008-2022 Toyota Sequoia AR4 Direct-Mount Rear Big Brake KitDirect Mount Series Rear Axle 4 Piston 2007 2021 Toyota Tundra (XK50) & 2008 2022 Toyota Sequoia (XK60) AR4 Direct Mount Rear Big Brake Kit The TTSPORT AR4 Rear Big Brake Kit is a Direct Mount Series rear axle upgrade for 2007 2021 Toyota Tundra (XK50) and 2008 2022 Toyota Sequoia (XK60). Forged 4 piston rear calipers, 365 mm 28 mm internally vented rotors, stainless steel braided lines, and vehicle specific fittings help restore balanced rear axle
Direct-Mount Series · Rear Axle · 4-Piston
2007-2021 Toyota Tundra (XK50) & 2008-2022 Toyota Sequoia (XK60) AR4 Direct-Mount Rear Big Brake Kit
The TTSPORT AR4 Rear Big Brake Kit is a Direct-Mount Series rear-axle upgrade for 2007-2021 Toyota Tundra (XK50) and 2008-2022 Toyota Sequoia (XK60). Forged 4-piston rear calipers, Ø365 mm × 28 mm internally vented rotors, stainless-steel braided lines, and vehicle-specific fittings help restore balanced rear-axle braking for towing, loaded driving, and matched front + rear brake builds.
Why Toyota Tundra XK50 & Sequoia XK60 Builders Choose the AR4
Rear brakes do more than add peak stopping force. Correct rear piston area, rotor mass, and caliper geometry help the chassis stay settled under hard braking, reduce front-heavy brake bias, and restore confident pedal feel when the truck is carrying passengers, cargo, or trailer load.
4-Piston Forged Caliper
Two-piece forged aluminum caliper body with 30 mm × 2 / 34 mm × 2 heat-insulated pistons and dust boots.
32.3 cm² Piston Area
32.3 cm² total piston area per caliper helps restore rear-axle braking contribution on loaded truck and SUV builds.
Ø365 mm × 28 mm Rear Rotor
One-piece internally vented rear rotor adds rear thermal capacity while keeping the Direct-Mount Series hardware simple and serviceable.
Vehicle-Specific Brake Lines
PTFE inner liner, SUS304 stainless-steel braid, and PVC protective outer sheath help reduce hose expansion and improve pedal consistency.
Balanced Rear Upgrade
Designed for towing, loaded driving, and matched front + rear brake builds without overpowering the rear axle.
AR4 Direct-Mount Technical Specifications & Kit Options
| 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 | Ø365 mm × 28 mm |
| Brake Rotor | |
| Rotor Material | Heat-treated high-carbon cast iron |
| Axle Position | Rear |
| Rotor Dimensions for This Application | Ø365 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 |
| Lines | |
| Brake Line Construction | Three-layer reinforced construction |
| Brake Line Material | PTFE inner liner / SUS304 stainless-steel braid / PVC protective outer sheath |
| Brake Line Fittings | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
| Vehicle Application & Rotor Mapping | |
| 2007-2021 Toyota Tundra (XK50) | Rear · Ø365 mm × 28 mm |
| 2008-2022 Toyota Sequoia (XK60) | Rear · Ø365 mm × 28 mm |
| Fitment & Installation | |
| Primary Vehicle Application | 2007-2021 Toyota Tundra (XK50) · 2008-2022 Toyota Sequoia (XK60) |
| Model Years | Toyota Tundra XK50: 2007-2021 · Toyota Sequoia XK60: 2008-2022 |
| Axle | Rear |
| Caliper Mounting Type | Direct mount |
| Minimum Wheel Size | 17 in or larger |
| Minimum Spoke Clearance | 100 mm |
| Parking Brake Compatibility | Vehicle-specific; confirm exact rear hardware before ordering |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
| Bedding-In Procedure | Required |
For 2007-2021 Toyota Tundra (XK50) and 2008-2022 Toyota Sequoia (XK60), the correct AR4 rear rotor specification is Ø365 mm × 28 mm. Confirm 17 in or larger wheels, 100 mm minimum spoke clearance, rear hardware, and parking-brake compatibility before ordering.
What’s Included in the AR4 Direct-Mount Kit
Calipers ×2
2 × AR4 forged 4-piston rear calipers, left/right specific.
Brake Pads
Brake pads for both rear calipers, rated 0–600 °C and intended for iron / steel rotors.
Brake Rotors ×2
2 × one-piece rear rotors, Ø365 mm × 28 mm, heat-treated high-carbon cast iron, internally vented, curved-slot, and left/right specific.
Brake Hoses ×2
2 × three-layer stainless-steel braided brake lines with PTFE inner liner, SUS304 braid, PVC protective outer sheath, and vehicle-specific fittings.
Mounting Hardware
Vehicle-specific direct-mount hardware for Toyota Tundra XK50 / Sequoia XK60 rear-axle installation.
Direct-Mount Series uses one-piece rotors and direct-mount rear calipers. Rotor Hats and Caliper Brackets are not used on this AR4 application.
Will It Fit Your Toyota Tundra XK50 or Sequoia XK60?
AR4 requires 17 in or larger wheels with at least 100 mm of spoke clearance. Rear parking-brake compatibility and vehicle-specific brake-line fittings must be confirmed before ordering.
1. Wheel Diameter
17 in or larger wheels are required.
2. Spoke Clearance
Minimum spoke clearance: 100 mm. Check spoke shape, offset, spacer use, and inner barrel profile before ordering.
3. Vehicle Model
Application: 2007-2021 Toyota Tundra (XK50) and 2008-2022 Toyota Sequoia (XK60), rear axle, with Ø365 mm × 28 mm rotor specification.
Send your model year, trim, rear brake hardware photos, wheel specs, and front brake setup before ordering so TTSPORT can confirm compatibility.
Installation & Bedding for Toyota Tundra XK50 & Sequoia XK60
- This AR4 kit is engineered for the rear axle of 2007-2021 Toyota Tundra (XK50) and 2008-2022 Toyota Sequoia (XK60).
- The correct rear rotor specification is Ø365 mm × 28 mm.
- Direct-Mount Series uses vehicle-specific rear mounting geometry and vehicle-specific brake-line fittings.
- Parking-brake compatibility depends on exact rear hardware configuration and must be confirmed before ordering.
- Confirm 17 in or larger wheels and 100 mm minimum spoke clearance before ordering.
- Rear brake performance is best when paired with a properly matched front setup. Confirm your front brake configuration before running a rear-only upgrade.
- A proper bedding-in procedure is required to transfer pad material evenly to the rotor face and stabilize friction performance.
- Professional installation by a qualified brake technician is recommended.
Toyota Tundra XK50 & Sequoia XK60 AR4 Rear Big Brake Kit FAQ
Will this AR4 rear kit fit 2007-2021 Toyota Tundra XK50 and 2008-2022 Toyota Sequoia XK60?
Yes. This AR4 Direct-Mount rear kit is configured for 2007-2021 Toyota Tundra (XK50) and 2008-2022 Toyota Sequoia (XK60). The correct rear rotor specification is Ø365 mm × 28 mm.
What axle and rotor size does this AR4 kit use?
This is a rear-axle kit using Ø365 mm × 28 mm one-piece, internally vented, directional rear rotors with a curved-slot face pattern.
What wheel size and spoke clearance are required?
17 in or larger wheels are required, with at least 100 mm minimum spoke clearance to the rear caliper. Wheel diameter alone is not enough; spoke shape, offset, spacer use, and inner barrel profile must be checked before ordering.
Does this kit include rotor hats or caliper brackets?
No. This is a Direct-Mount Series AR4 application with one-piece rear rotors and direct-mount rear calipers. Rotor Hats and Caliper Brackets are not used on this configuration.
Is parking brake compatibility retained?
Parking-brake compatibility is vehicle-specific and depends on the exact rear hardware configuration. Confirm your model year, trim, and rear brake hardware with TTSPORT before ordering.
Can I install this as a rear-only upgrade?
It can be installed as a rear upgrade, but rear brake performance is best when paired with a properly matched front setup. Confirm your front brake configuration with TTSPORT before running a rear-only upgrade.
Is bedding-in required?
Yes. A proper bedding-in procedure is required to transfer pad material evenly to the rotor face and stabilize friction performance.
Ready to spec your AR4 Tundra or Sequoia rear brake build?
Need rear fitment confirmation, wheel clearance review, or a matched front + rear brake setup?
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
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