Infiniti Q50 Big Brake Kit Upgrade / TTSPORT Classic 7640
Since its 2013 debut, the Infiniti Q50 has carved out a spot in the mid-size luxury segment with sharp styling, a rear-drive layout, and genuine sport-sedan ambitions. But bolt on a set of bigger wheels — as most Q50 owners eventually do — and the factory brakes suddenly look lost. Small floating calipers rattling around inside 19-inch wheels don't just look thin, they undersell what the car is capable of. This case swaps in a TTSPORT Classic 7640 six-piston front kit to fix both the look and the pedal.
The stock setup on a wheel-upgraded Q50 tends to leave a lot of empty space behind the spokes. Beyond the visual gap, small floating calipers also give up rigidity and pad area compared with a fixed, multi-piston design — which shows up as a softer, less consistent pedal under hard use.
Vehicle & Kit Specs
This Q50 build pairs 19-inch wheels with a TTSPORT Classic 7640 front kit, sized specifically to close the wheel gap without needing spacers or other clearance workarounds.
| Item | Specification |
|---|---|
| Vehicle | Infiniti Q50, 19-inch wheels |
| Front caliper | TTSPORT 7640 forged six-piston, Classic Series |
| Front rotor | TTSPORT 380mm high-carbon rotor |
| Bracket | Vehicle-specific caliper mounting bracket |
| Pads / lines | TTSPORT high-performance pads, stainless brake lines |
| Hardware | Brake fluid, mounting bolts, and fixing hardware |
With the caliper and rotor filling out the wheel, the car's stance reads noticeably lower and more planted — the kind of visual weight shift that only a properly sized brake package delivers, without touching ride height.
Below is the full spec sheet for the TTSPORT 7640 caliper used in this kit.
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 7640 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 27 mm × 2 / 33 mm × 2 / 38 mm × 2 |
| Caliper Dimensions | L 353 mm × W 162 mm × H 92 mm |
| Total Piston Area | 51.2 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.70 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 18 in or larger |
| Recommended Rotor Size | Ø355–380 mm × 32 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 98 |
| Caliper Mounting Type | Radial mount with vehicle-specific caliper brackets |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
Why It Works
- Forged two-piece body: the 7640's forged aluminum construction and vented cutouts resist flex under hard braking, which keeps the pedal firm and predictable instead of going soft as clamping force ramps up.
- Six-piston, progressive layout: the graduated piston sizes (27/33/38mm) apply pad pressure more evenly across the pad face, giving a linear, controllable bite rather than an on/off grab.
- 380mm rotor mass: a larger rotor stores and sheds more heat per stop, which is the main lever against brake fade during repeated hard braking.
- Two-piece heat-insulated pistons with dust boots and high-temp seals hold up to sustained heat cycling without losing seal integrity or clamping consistency.
- Vehicle-specific bracket geometry: the kit is engineered around the Q50's 19-inch wheel package, so the caliper and rotor clear the spokes without spacers.
Installation Gallery
What wheel size does this Q50 big brake kit fit behind?
What's included in the TTSPORT 7640 kit for the Infiniti Q50?
What rotor sizes work with the 7640 caliper?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.