Tesla Model Y Big Brake Kit Upgrade / TTSPORT Classic 8703
Tesla's China-spec Model Y is quick — a 0-60 time in the mid-5-second range on the Performance trim — but the factory brake package is sized for daily commuting, not repeated hard stops. This case study covers a full front-and-rear TTSPORT upgrade: a front six-piston kit, a rear four-piston kit with an electronic parking brake (EPB) caliper, and larger high-carbon rotors on both axles, all installed behind the car's factory 20-inch wheels.
The stock Model Y caliper is a single-piston floating design — adequate for regulatory stops, but it flexes under sustained heavy braking and offers limited pad contact area. Swapping to a forged fixed caliper and a larger rotor addresses both the pedal feel and the heat-management side of the equation.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Tesla Model Y (China-spec Performance), 20-inch factory wheels |
| Front caliper | TTSPORT TT8703 forged six-piston fixed caliper, vented pistons |
| Front rotor | TTSPORT 380x34mm high-carbon heat-treated drilled rotor |
| Rear caliper | TTSPORT TT6411 four-piston fixed caliper + TTSPORT EPB electronic parking brake caliper |
| Rear rotor | TTSPORT 380x28mm high-carbon heat-treated drilled rotor |
| Lines / hardware | TTSPORT stainless steel brake lines, vehicle-specific mounting hardware |
Front Axle: TT8703 Six-Piston Setup
The TT8703 is a six-piston forged caliper aimed at street/daily-driving upgrades — a distinctive shape behind the wheel and a firmer pedal than the factory single-piston unit. Pistons are vented for heat dissipation, which helps keep clamping pressure consistent through repeated stops instead of fading as fluid temperature climbs. It pairs with a 380x34mm high-carbon heat-treated drilled rotor, adding rotor mass and surface area over the factory disc.
Rear Axle: TT6411 Four-Piston + EPB Caliper
The rear axle runs a TT6411 four-piston caliper on a 380x28mm rotor, matched with a TTSPORT electronic parking brake caliper to keep the Model Y's factory EPB function working. The EPB caliper is a bolt-on unit — it doesn't require machining or modifying the factory caliper bracket, so the swap doesn't touch any other original hardware on the car.
Why It Works
- A forged fixed caliper doesn't flex the way a single-piston floating caliper does under load, so more of your pedal input goes into clamping force instead of caliper deflection.
- Larger, thicker rotors (380x34mm front, 380x28mm rear) hold more heat before surface temperatures spike, which delays fade on repeated hard stops.
- Both kits are sized to clear the car's factory 20-inch wheels with no spacers, and the rear EPB caliper preserves the factory electronic parking brake without altering the OEM bracket.
Installation Gallery
What size wheels does this TTSPORT big brake kit fit on the Tesla Model Y?
Does the rear EPB caliper require modifying the factory parking brake hardware?
What's included in the front and rear kits?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.