Tesla Model 3 Big Brake Kit Upgrade / TTSPORT Classic 8703S
Rising gas prices keep pushing more drivers toward EVs, and the Tesla Model 3 is one of the biggest winners of that shift. Its stock brakes are four-piston calipers sourced from Brembo — solid hardware on paper, but owners who push the car hard often report a stiff, firm pedal with not much room left to work with. This case looks at a Model 3 that went the other direction: a TTSPORT front six-piston kit paired with larger rear rotors.
The build: TT8703S six-piston front calipers with 405x34mm high-carbon heat-treated rotors, a 370x22mm rear rotor upgrade, and TTSPORT stainless steel brake lines — all fitted under the car's 21-inch wheels.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Tesla Model 3, 21-inch wheels |
| Front caliper | TTSPORT TT8703S six-piston, one-piece cast caliper with competition-grade stainless steel pistons |
| Front rotor | 405 x 34mm high-carbon heat-treated rotor, drilled and vented |
| Rear rotor | 370 x 22mm big-rotor upgrade |
| Bracket | Vehicle-specific caliper mounting bracket (adapter) |
| Lines | TTSPORT stainless steel braided brake lines |
TT8703S is built as a street-and-track dual-use six-piston caliper, using a one-piece casting process with competition-grade stainless steel pistons for consistent clamping and heat resistance. The 405mm rotor uses a special high-carbon composition intended to resist warping and vibration under repeated heat cycling; the cross-drilled face clears pad dust while the vented design pulls heat away to hold off fade.
Why It Works
- The one-piece cast six-piston caliper resists flex under hard braking, giving a firmer, more predictable pedal than the stock unit.
- A larger 405x34mm front rotor adds thermal mass, so it absorbs and sheds more heat before fade sets in.
- The 370x22mm rear rotor upgrade increases rear rotor size, which helps balance braking front-to-rear and can reduce brake "nose-dive" on some vehicles.
- The caliper bracket and steel-braided lines are small parts, but they're the link that keeps the whole system rigid and consistent under pressure — as important as the caliper or rotor itself.
Installation Gallery
Does this big brake kit fit the Tesla Model 3's factory wheels?
What's included in the TTSPORT TT8703S kit for the Model 3?
Why upgrade from the stock Model 3 brakes at all?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.