Audi A4 (B9) Big Brake Kit Upgrade / TTSPORT 8703
This Audi A4 B9 came in with a factory brake package that simply didn't match the rest of the build — a color-swapped emerald-green body deserved something with more visual punch and more stopping authority behind the wheels. The fix: a red TTSPORT 8703 six-piston caliper up front and a 350x12mm rotor upgrade out back.
The project: front TT8703 six-piston calipers plus a TTSPORT 350x12mm oversized rear rotor — a straightforward upgrade path that also happened to tie the whole build's color scheme together.
Vehicle & Kit Specs
Here's what went on the car, broken down by component.
| Item | Specification |
|---|---|
| Vehicle | Audi A4 (B9) |
| Front caliper | TTSPORT 8703 six-piston caliper, red finish |
| Front rotor | Drilled, Dacromet-coated rotor for improved heat dissipation |
| Rear rotor | TTSPORT 350mm x 12mm oversized drilled rotor |
| Rear caliper | OEM caliper, repainted red to match the front |
Up front, the red TT8703 six-piston caliper sits behind a black wheel — the drilled, Dacromet-coated rotor helps shed heat faster than a stock disc while the red-on-black combo reads as intentional rather than flashy.
Why It Works
- A six-piston forged caliper up front spreads clamping force over more pad area than a stock caliper, which matters when heat and repeated stops start to load up the system.
- The drilled, Dacromet-coated front rotor is built to dissipate heat more effectively than the factory disc, helping keep braking consistent under harder driving.
- Stepping the rear rotor up to a 350mm x 12mm disc gives the OEM rear caliper more surface area to work with, balancing the added front bite instead of leaving the rear underpowered.
- Color-matching the front TT8703 caliper and the repainted rear caliper ties the whole underbody look together without adding extra competing colors to the car.
Installation Gallery
FAQ
What does this Audi A4 B9 brake upgrade include?
Does the rear axle also get a big brake caliper?
Why pair red calipers with a black wheel on this build?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.