Denza D9 Big Brake Kit Upgrade / TTSPORT Slim SL6
The Denza D9 has become a fixture in the premium new-energy MPV segment, and it's easy to see why: a spacious cabin, strong electric drive, and comfort suited to everything from family road trips to business travel. But that comfort and performance come with weight, and the factory brakes weren't built to keep up with it.
At over 2.3 tons fully loaded and with a powerful electric drivetrain, the D9 handles routine city driving fine. Push it harder — a fully loaded highway run, repeated hard stops, or tricky road conditions — and the stock brakes start to show their limits.
Owners report longer stopping distances, noticeable heat fade, and a pedal that goes soft after repeated hard braking at highway speed — the classic symptoms of a stock brake system that's simply undersized for the vehicle's mass. The pedal loses its linearity, and with it, driver confidence.
The catch for most D9 owners looking to upgrade: high-performance six-piston calipers are usually too big to clear the factory 18-inch wheels, forcing a switch to larger wheels, deeper offsets, or flange adapters just to make them fit. That adds cost and introduces fitment and safety questions many owners would rather avoid.
Vehicle & Kit Specs
TTSPORT built the SL6 specifically around the Denza D9's factory wheel geometry, so the kit installs directly behind the stock 18-inch wheels with no spacers or wheel swap.
| Item | Specification |
|---|---|
| Vehicle | Denza D9, stock 18-inch wheels |
| Front caliper | TTSPORT SL6 forged six-piston caliper |
| Front rotor | TTSPORT 355mm high-carbon rotor |
| Bracket | Vehicle-specific caliper bracket, custom-fit to the D9 |
| Pads / lines | TTSPORT high-performance pads, stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts, and fastening hardware |
Below is the official TTSPORT SL6 spec sheet for the caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Slim Series |
| Model / Application | SL6 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | One-piece heat-insulated pistons |
| Piston Diameter | 28 mm × 2 / 30 mm × 2 / 36 mm × 2 |
| Caliper Dimensions | L 350 mm × W 135 mm × H 120 mm |
| Total Piston Area | 46.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.60 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–355 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 82 |
| 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
The SL6 caliper is a two-piece forged unit rather than a cast one. Forging produces a denser, stiffer body, which means less flex under hard braking and a firmer, more linear pedal feel — the caliper doesn't deform and eat pedal travel the way a heavier, flex-prone unit can.
Pairing that caliper with a 355mm high-carbon rotor adds mass and surface area over the stock disc, giving the system more thermal capacity to absorb heat during repeated hard stops. That's what addresses the fade the D9's factory brakes show under sustained highway braking.
- Six-piston forged caliper spreads clamping force more evenly across the pad, shortening stopping distance versus the factory single-function caliper.
- High-carbon rotor construction is built for heat resistance and faster dissipation, supporting repeated hard braking without the fade the D9 shows stock.
- Developed against the D9's factory geometry, so the kit clears the stock 18-inch wheel — no flange adapters, no wheel upgrade needed.
- Bolts in at the stock caliper location and retains the factory ABS and ESP systems.
Installation Gallery
FAQ
Does the TTSPORT SL6 kit fit the Denza D9's stock 18-inch wheels?
What does the TTSPORT SL6 kit include for the Denza D9?
Does installing the SL6 kit affect the Denza D9's ABS or ESP?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.