Li Auto L8 Big Brake Kit Upgrade / TTSPORT Evolution EB8/EP4
The Li Auto L8 is built to haul a full family in comfort, and it does that job well. But that same comfort-tuned suspension and factory brake package starts to show its limits once the cabin is loaded up, the road turns to mountain switchbacks, or a long highway trip calls for repeated hard stops. One L8 owner ran into exactly that — plenty of comfort, not enough brake — and addressed it with a TTSPORT front 8-piston / rear 4-piston big brake kit.
A vehicle this size and weight, loaded with passengers and cargo, puts real demand on a brake system that was tuned primarily for ride comfort. Fade and a soft pedal show up first on long descents or repeated stops — the exact scenario a family hauler faces on road trips.
Vehicle & Kit Specs
The owner went with a matched front-and-rear TTSPORT Evolution Series setup, kept the factory 21-inch wheels, and used a vehicle-specific bracket rather than any generic adapter.
| Item | Specification |
|---|---|
| Vehicle | Li Auto L8, 21-inch factory wheels |
| Front caliper | TTSPORT EB8 — Evolution Series, forged 8-piston |
| Front rotor | TTSPORT 405mm high-carbon rotor |
| Rear caliper | TTSPORT EP4 — Evolution Series, electromechanical (4-piston service brake + integrated single-piston electronic parking brake) |
| Rear rotor | TTSPORT 380mm high-carbon rotor |
| Bracket | Custom vehicle-specific caliper mounting bracket |
| Pads / lines | TTSPORT performance brake pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
Here is the official spec sheet for the front TTSPORT EB8 caliper used in this build:
| Brake Caliper | |
|---|---|
| Series | Evolution Series |
| Model / Application | EB8 |
| Axle Position | Front |
| Piston Count | 8-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 28 mm × 4 / 32 mm × 4 |
| Caliper Dimensions | L 349 mm × W 166 mm × H 98 mm |
| Total Piston Area | 56.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 4.95 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 19 in or larger |
| Recommended Rotor Size | Ø380–405 mm × 34 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 107 |
| 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 EB8 up front is a two-piece forged caliper with eight pistons arranged symmetrically across four pad contact points. That layout spreads clamping force evenly over the pad surface, so initial bite is progressive rather than grabby, and pedal effort stays linear as you push harder into the stop — instead of the caliper flexing and the pedal going soft, the way a stock single-piston sliding caliper can under sustained load.
The 405mm front and 380mm rear rotors add rotational mass and swept area over the factory discs, giving the system more thermal capacity to absorb heat before it fades — the difference that matters most on long descents with a fully loaded cabin.
- Two-piece heat-insulated pistons on both EB8 and EP4 calipers limit heat transfer into the brake fluid, keeping pedal feel consistent as temperatures rise.
- The rear EP4 keeps the electronic parking brake fully functional — its single-piston EPB section is built into the same caliper body as the four-piston service brake, so there's no separate parking-brake mechanism to package around.
- A vehicle-specific bracket locates each caliper for the L8's factory 21-inch wheels, matched to the recommended 19-inch-or-larger wheel fitment for the EB8 caliper.
Installation Gallery
What wheel size does this Li Auto L8 big brake kit fit under?
Does the rear TTSPORT caliper on this kit still work with the electronic parking brake?
What's different between the front EB8 caliper and the rear EP4 caliper in this kit?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.