Infiniti QX70 Big Brake Kit Upgrade / TTSPORT Classic 8703S/8901
The Infiniti QX70 is a big animal — nearly 2 meters tall, close to 2.5 tons curb weight, and packing a 3.7L VQ37 V6 good for 351 hp and 363 Nm through a 7-speed automatic. That's a lot of momentum for a stock brake system to manage, especially with a full load of passengers or gear. This QX70 owner opted for a front-six/rear-four TTSPORT brake upgrade to give the pedal more authority and the rotors more thermal capacity for repeated hard stops.
The build runs entirely under the QX70's factory 21-inch wheels — no spacers, no wheel changes required to make the kit fit.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Infiniti QX70, 21-inch factory wheels |
| Front caliper | TTSPORT TT8703S cast six-piston caliper, racing-grade stainless steel pistons |
| Front rotor | 380mm x 34mm high-carbon heat-treated drilled rotor |
| Rear caliper | TTSPORT TT8901 cast four-piston caliper |
| Rear rotor | 380mm x 28mm high-carbon heat-treated drilled rotor |
| Lines | TTSPORT stainless steel brake lines (rear) |
Up front, the TT8703S six-piston caliper spreads clamping force across a wider pad area than the stock caliper, backed by the 380x34mm rotor's added mass for more consistent heat absorption on long descents or repeated braking.
Why It Works
- A cast six-piston front caliper distributes clamping force over more pad surface than the factory caliper, which sharpens initial bite and reduces the pedal travel needed to build pressure.
- The 380x34mm front and 380x28mm rear rotors add rotor mass over stock, giving the system more thermal capacity to resist fade when the QX70's weight is working against it on repeated stops.
- Drilled rotor faces on both axles help vent heat generated during braking, which matters more on a heavier SUV than it does on a lighter sedan.
- The kit was installed and confirmed to clear the QX70's stock 21-inch wheels with no spacers needed.
Installation Gallery
FAQ
What wheel size does this Infiniti QX70 big brake kit fit?
What's included in the front and rear TTSPORT kits on this QX70?
Why use drilled rotors on a heavy SUV like the QX70?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.