BMW 1 Series Big Brake Kit Upgrade / TTSPORT Classic 9040
The BMW 1 Series already looks the part with its sharp shoulder line and pulled-back C-pillar kink, but the factory brakes underneath don't always match the attitude. This build swaps in a TTSPORT TT9040 big brake kit up front, pairing a forged six-piston caliper with a larger 355x32mm rotor — all tucked behind the car's stock 18-inch wheels.
The build: a TTSPORT TT9040 forged six-piston caliper, a TT 355x32mm high-carbon heat-treated rotor, and TTSPORT stainless steel brake lines up front. Wheel size for this fitment is 18 inches, no spacers involved.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW 1 Series, 18-inch factory wheels |
| Front caliper | TTSPORT TT9040 forged six-piston caliper |
| Front rotor | TTSPORT 355x32mm high-carbon heat-treated rotor |
| Lines | TTSPORT stainless steel brake lines |
The TT9040's flowing caliper lines match the 1 Series' own design language, and the bright caliper finish adds visual contrast without looking bolted-on.
Why It Works
- A forged caliper body resists flex under hard braking compared to a stock caliper, which translates into a firmer, more predictable pedal.
- Stepping up to a 355x32mm rotor adds swept area and thermal mass over the factory disc, giving the system more capacity to absorb and shed heat.
- Stainless steel lines resist expansion under pressure, so pedal effort goes into clamping force instead of flexing rubber hose.
- The kit clears the car's stock 18-inch wheels, so this is a straightforward fitment upgrade rather than a wheel-swap project.
Installation Gallery
What wheels does the TTSPORT TT9040 kit fit on a BMW 1 Series?
What's included in the TT9040 big brake kit?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.