Li Auto ONE Big Brake Kit Upgrade / TTSPORT Classic 8705
The Li Auto ONE is built to haul kids, gear, and everything in between, and its electric-plus-range-extender drivetrain gets it to 62 mph in around 7 seconds. That kind of shove is fun until you need to shed the speed just as fast — and this owner found the factory floating caliper went soft under repeated hard stops. The fix: a TTSPORT TT8705 six-piston big brake kit up front.
The owner's complaint wasn't about outright stopping distance — it was pedal feel. Under repeated heavy braking, the factory floating caliper started to feel soft and inconsistent, which erodes confidence more than a longer stopping distance ever does. A fixed, multi-piston caliper keeps the pads pressed evenly and predictably against the rotor, which is the first thing that needed fixing here.
TTSPORT recommended the TT8705, a fixed six-piston caliper, specifically to reduce unsprung mass at the corner and to give the pedal a more linear feel — you get out what you put in, from light taps to full stops, instead of a mushy first-inch of travel.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Li Auto ONE, 20-inch factory wheels |
| Front caliper | TTSPORT TT8705 cast fixed six-piston caliper — 340mm long, 3.60 kg per unit, piston diameters 38mm / 34mm / 30mm (paired, six pistons total), ventilated piston design for better heat management |
| Front rotor | 380x34mm high-carbon heat-treated rotor with curved-line (arc) pattern |
| Brake lines | TTSPORT stainless steel brake lines |
Why It Works
- A fixed, cast caliper body flexes less under load than a factory floating caliper, so pedal pressure translates directly into clamping force instead of getting absorbed by caliper deflection.
- Ventilated pistons in three graduated diameters (38/34/30mm) help manage heat at the pad interface, which matters on a heavier vehicle that carries family and cargo.
- The 380x34mm rotor adds mass and surface area over the stock disc, giving the system more thermal capacity to resist fade during repeated stops.
- Stainless steel lines reduce hose expansion under pressure, so less of your pedal input is lost before it reaches the caliper.
Together, the goal isn't just shorter stops — it's a brake pedal that tells the driver the truth about how much grip is left, stop after stop.
Installation Gallery
What wheel size does the TT8705 kit fit on the Li Auto ONE?
What does the TT8705 upgrade kit include?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.