Zeekr X Big Brake Kit Upgrade / TTSPORT Classic 7640
The Zeekr X is built on the SEA architecture and pitched as a compact luxury EV with genuine performance intent — the dual-motor version puts out 315kW and gets to 60 mph in the low 3-second range. That kind of thrust exposes a common EV problem fast: the factory brakes are sized for daily commuting, not for repeated hard stops at speed or a run of switchbacks. This case documents a front-axle upgrade to a TTSPORT 7640 six-piston big brake kit on a 19-inch-wheeled Zeekr X, aimed at giving the car a pedal that matches how quickly it accelerates.
On regular streets the stock brakes did their job. Once the owner started driving harder — mountain roads, higher-speed stops — the factory setup's limits showed up as fade and a pedal that felt less predictable under repeated braking. The fix was a straightforward hardware swap on the front axle rather than any electronics tuning.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Zeekr X, 19-inch factory wheels |
| Front caliper | TTSPORT 7640 forged six-piston caliper |
| Front rotor | TTSPORT 380mm high-carbon rotor |
| Bracket | Custom, vehicle-specific caliper bracket |
| Pads / lines | TTSPORT performance pads, stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
The caliper used in this build is TTSPORT's Classic Series 7640. Its full spec sheet is below for reference.
| 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 |
The kit shown here is a complete front-axle package — caliper, rotor, custom bracket, pads, stainless lines, fluid, and the bolts needed to mount it — rather than a caliper sold on its own.
Why It Works
- The 7640's two-piece forged aluminum body resists flex under hard braking, so clamping force goes into the rotor instead of into caliper distortion — that's what makes the pedal feel more direct and predictable.
- Six pistons across three diameters (27/33/38mm) spread clamping force more evenly across the pad, and the larger 380mm rotor gives the system more mass to absorb heat, which helps resist fade during repeated hard stops.
- The vehicle-specific bracket and hardware are sized for the Zeekr X's factory 19-inch wheels, matching TTSPORT's published 18-inch-and-up wheel recommendation for the 7640.
The owner's takeaway lines up with the mechanics: initial bite is more responsive, mid-to-late pedal travel builds force in a linear, controllable way, and there's no abrupt nose-dive under a hard stop. For a car that already accelerates like the Zeekr X, that predictability matters as much as outright stopping power.
Installation Gallery
FAQ
What brake upgrade was installed on the Zeekr X in this case?
Does the TTSPORT 7640 kit fit behind the Zeekr X's stock wheels?
What is the piston configuration of the TTSPORT 7640 caliper?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.