MINI Cooper Big Brake Kit Upgrade / TTSPORT Classic 9040
16 Jul 2026
A MINI Cooper's factory brakes work fine around town, but push it hard through a set of switchbacks or a track day and the pedal starts to go soft fast — the small stock rotors and calipers just run out of thermal capacity. This car's owner went with a TTSPORT TT9040 forged six-piston front kit paired with an oversized 345x10mm rear rotor and stainless lines, all fitting behind the MINI's factory 18-inch wheels.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW MINI Cooper, 18-inch wheels |
| Front caliper | TTSPORT TT9040 two-piece forged six-piston caliper, approx. 3.6 kg, stainless heat-resistant pistons |
| Front rotor | 355mm x 32mm high-carbon heat-treated drilled rotor |
| Rear rotor | 345mm x 10mm TTSPORT oversized rotor kit |
| Lines | TTSPORT stainless steel brake lines |
Fitment stayed within the factory 18-inch wheel — the TT9040 caliper and 355mm rotor combination went on without spacers or wheel changes, which keeps the swap straightforward for a daily-driven MINI.
Why It Works
- The TT9040's two-piece forged body is rigid and light (about 3.6 kg), so caliper flex under hard braking is minimized — that's a firmer, more predictable pedal instead of a spongy one.
- Stainless heat-resistant pistons help the caliper shed heat and need less clamping pressure to hold the same braking force once things get hot, which is what keeps braking consistent lap after lap.
- A 355x32mm front rotor carries more mass and surface area than the stock disc, giving it more heat capacity before fade sets in.
- Stepping the rear rotor up to 345x10mm increases pad contact area at that axle, which improves rear brake performance and balance to match the bigger front upgrade — and fills out the wheel visually to boot.
Installation Gallery
What wheel size does this MINI Cooper brake kit fit?
This TTSPORT kit was installed on a BMW MINI Cooper running 18-inch wheels, with the front TT9040 caliper and rotor fitting behind them.
What does the front TTSPORT kit include?
The front upgrade uses a TTSPORT TT9040 two-piece forged six-piston caliper paired with a 355mm x 32mm high-carbon heat-treated drilled rotor.
What was upgraded at the rear?
The rear axle received a TTSPORT 345mm x 10mm oversized rotor kit along with TTSPORT stainless steel brake lines.
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.