Li Auto ONE Big Brake Kit Upgrade / TTSPORT Classic 8705

The Li Auto ONE is a big vehicle — around 2,300 kg curb weight — and its stock brakes show it. Hard stops are fine, but the everyday, low-speed pedal application that drivers actually use most often feels soft and vague, which on a heavy three-row SUV translates into a "can't quite stop it" sensation. This case follows a well-known car enthusiast's Li Auto ONE getting a full front-and-rear TTSPORT big brake kit to fix exactly that.

The build runs a front TT8705 monobloc six-piston caliper with a 380x34mm rotor, and a rear TT6411 four-piston caliper with a 380x28mm rotor plus a dedicated TTSPORT electronic parking brake caliper — a front-six/rear-four setup on 20-inch wheels.

Vehicle & Kit Specs

Here's the full hardware breakdown for this Li Auto ONE build.

The TT8705 caliper is a monobloc (one-piece) design rather than a bolted two-piece body, which cuts down on flex under load. With six pistons spread across the caliper, clamping force lands more evenly across the pad — a straightforward mechanical answer to the soft initial pedal feel a heavy SUV struggles with on stock hardware.

Why It Works

• A monobloc caliper body flexes less than a stock floating caliper under hard braking, which firms up initial pedal feel instead of the pedal "giving" before the pads bite.
• Bigger rotors (380mm front and rear) carry more mass and surface area, giving the system more thermal capacity to resist fade on repeated stops with a heavy SUV.
• Six pistons up front versus a smaller stock piston count spreads clamping force more evenly across the pad, improving modulation rather than just peak bite.
• Pairing the rear performance caliper with a dedicated TTSPORT EPB caliper keeps the electronic parking brake working after the upgrade — no loss of factory function.

Installation Gallery

FAQ