Mercedes-Benz C-Class (W205) Big Brake Kit Upgrade / TTSPORT Classic 8703
The W205-generation C-Class is one of Mercedes' more athletic small sedans, and this owner's 1.5T car — good for roughly 184 horsepower and an eight-second-range 0-60 — was starting to outrun its stock brakes on spirited drives. Rather than a full track-brake overhaul, the fix here was straightforward: a six-piston TTSPORT big brake kit up front and a direct-fit oversized rotor kit out back, all tucked behind the car's stock 19-inch wheels.
Front axle: TTSPORT TT8703 connected (monobloc) six-piston caliper matched to a 380mm x 34mm high-carbon, heat-treated, cross-drilled rotor. Rear axle: TTSPORT 340mm x 12mm oversized rotor and stainless brake lines, both installed in the OEM mounting position.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Mercedes-Benz C-Class (W205), 19-inch wheels |
| Front caliper | TTSPORT TT8703 monobloc six-piston fixed caliper |
| Front rotor | 380mm x 34mm high-carbon, heat-treated, cross-drilled rotor |
| Rear rotor | TTSPORT 340mm x 12mm oversized rotor, direct fit at the stock mounting position |
| Rear lines | TTSPORT stainless steel brake lines |
Why It Works
The TT8703's six-piston design is built around a wide rotor range — 355mm to 405mm in diameter, 32mm to 34mm thick — which means more pad surface area contacting the disc. More clamping surface translates into stronger, more consistent bite whether you're braking hard once or repeatedly through a mountain road.
- Larger 380mm front rotor adds thermal mass, helping resist fade under repeated hard stops.
- Cross-drilled rotor surface helps clear gas and debris for a more consistent pedal.
- Rear 340x12mm rotor bolts to the factory mounting point, no bracket modification needed at the rear axle.
Pairing an oversized rear rotor with the front six-piston kit balances brake bias front-to-rear, so the added front stopping power isn't fighting an unchanged rear axle. It's also a cost-effective way to upgrade the rear half of the system without touching the caliper hardware back there.
Installation Gallery
FAQ
What does the TTSPORT kit include on this W205 build?
What rotor sizes does the TT8703 caliper support?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.