BMW 3 Series Big Brake Kit Upgrade / TTSPORT Classic 8703
The BMW 3 Series and Mercedes-Benz C-Class get cross-shopped constantly, and enthusiasts still argue over which one drives better — the 3 Series usually wins on handling and interior space, but nobody's bragging about its factory brakes. This build addresses that with a TTSPORT TT8703 six-piston front kit, and because the TT8703 caliper needs at least a 19-inch wheel to clear, the owner upgraded the wheels right along with the brakes.
The finished setup: TTSPORT TT8703 six-piston calipers up front, paired with 19-inch wheels to give the bigger hardware the clearance it needs.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW 3 Series, fitted with 19-inch wheels (factory wheels are 18-inch) |
| Front caliper | TTSPORT TT8703 forged six-piston fixed caliper |
| Front rotor | TTSPORT slotted two-piece rotor |
| Brake lines | TTSPORT stainless steel brake lines |
The TT8703 is built around a six-piston fixed caliper, which requires a minimum 19-inch wheel to clear. Since this 3 Series came with 18-inch factory wheels, the wheel swap wasn't optional — it's part of making the kit fit.
Why It Works
- A fixed six-piston caliper clamps from both sides against a rigid body, which cuts down on the flex a factory sliding caliper can develop under hard braking.
- The slotted rotor face is designed to keep the pad's contact surface cleaner over repeated stops, which the source notes helps rotor cleanliness as well as its look.
- Going with a two-piece rotor design is part of how TTSPORT keeps the finished look — and the fit — clean on this GT-styled kit.
Installation Gallery
FAQ
Does the TT8703 kit fit stock 18-inch BMW 3 Series wheels?
What does this TT8703 brake upgrade include?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.