Changan UNI-V Big Brake Kit Upgrade / TTSPORT Classic 7640
Stock brakes on a sport sedan like the Changan UNI-V do their job in daily driving, but the factory caliper and rotor package is sized for cost and NVH, not repeated hard stops. This build swaps the front axle to a TTSPORT Classic Series 7640 kit — a six-piston forged caliper matched to a larger rotor — to add clamping force and heat capacity without touching the wheel size.
The finished install sits cleanly behind the UNI-V's stock wheel — no spacers, no rubbing. The 7640 caliper is engineered around an 18-inch-and-up wheel fitment window, so the factory alloy on this car clears it with room to spare.
Vehicle & Kit Specs
Here's the hardware breakdown for this install:
| Item | Specification |
|---|---|
| Vehicle | Changan UNI-V, front axle upgrade, factory wheel retained |
| Front caliper | TTSPORT Classic Series 7640, six-piston, two-piece forged aluminum body |
| Front rotor | Compatible with rotors in the kit's recommended Ø355–380mm x 32mm range |
| Bracket | Radial-mount, vehicle-specific caliper bracket |
| Pads / lines | Pads matched to the 7640 caliper; vehicle-specific stainless brake lines |
| Hardware | Mounting hardware and brake fluid for a complete front-axle install |
The table below is TTSPORT's official spec sheet for the 7640 caliper used in this build.
| 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 |
Up close, the 7640's two-piece forged aluminum body and six-piston layout are visible — three piston pairs (27mm, 33mm, 38mm) spread clamping force across a larger pad area than a stock single- or twin-piston floating caliper.
Why It Works
- A fixed, forged caliper body flexes less than a stock sliding caliper under hard braking, which translates to firmer, more consistent pedal feel at the pedal instead of a soft, progressive squish.
- Six pistons across three diameters clamp a larger pad footprint than the factory caliper, so total piston area (51.2 cm² per side) does more of the work rather than relying purely on line pressure.
- The kit is built around an 18-inch-and-up wheel fitment window with a defined 98mm minimum spoke clearance, so it's designed to clear factory wheels of the right size without spacers.
Installation Gallery
Does the TTSPORT 7640 kit fit under the Changan UNI-V's stock wheels?
What does the TTSPORT 7640 front big brake kit include?
Is the TTSPORT 7640 a monoblock caliper?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.