Li Auto ONE Big Brake Kit Upgrade / TTSPORT Classic 8703
The Li Auto ONE pairs a 1.2T range-extender with dual permanent-magnet motors for 240 kW combined output and a 6.5-second 0-100 km/h run — quick for a three-row SUV. Stock brakes on a vehicle this heavy and this quick get worked hard, and the owner of this ONE brought it to TTSPORT for a front-and-rear big brake kit built around the factory 20-inch wheels.
The kit went on front and rear: a TT8703 monobloc six-piston caliper with a 405x34mm drilled rotor up front, and a TT6411 four-piston caliper with a 380x28mm drilled rotor plus a dedicated EPB electronic parking brake caliper and stainless lines out back.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Li Auto ONE, extended-range SUV, factory 20-inch wheels |
| Front caliper | TTSPORT TT8703 monobloc six-piston caliper |
| Front rotor | 405x34mm high-carbon heat-treated drilled rotor |
| Rear caliper | TTSPORT TT6411 four-piston caliper + EPB electronic parking brake caliper |
| Rear rotor | 380x28mm high-carbon heat-treated drilled rotor |
| Lines / hardware | TTSPORT stainless steel brake lines and mounting hardware |
Why It Works
The TT8703 caliper is cast as one aluminum-alloy piece rather than bolted halves, so it doesn't flex open under hard braking the way a two-piece caliper can — that rigidity is what keeps pedal feel firm instead of going soft when the pads are loaded up. The built-in dust boots also cut down on maintenance, which is part of why this caliper shows up often on owners who take their vehicles off-road or through dusty conditions.
- Larger 405mm front / 380mm rear rotors add mass and surface area, giving the system more heat capacity to resist fade during repeated hard stops.
- The rear TT6411 kit integrates a dedicated EPB caliper, so the factory electronic parking brake keeps working — no need to delete or bypass it.
- Stainless steel lines resist the swelling that rubber lines develop under repeated pressure, keeping pedal input consistent lap after lap or stop after stop.
Installation Gallery
What wheel size does this Li Auto ONE big brake kit fit?
Does the rear kit work with the Li Auto ONE's electronic parking brake?
What's included in the TTSPORT kit for this car?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.