Audi A4 Big Brake Kit Upgrade / TTSPORT Slim SL6
Few German sedans have stuck around as long as the Audi A4. From the B5 in 1994 through the B6, B7, B8, and now B9, the A4 has quietly evolved from a badge-conscious commuter into a genuinely capable, lightweight platform worth driving hard — which is exactly why so many owners eventually look at their brakes.
The catch for a lot of A4 owners: the car still rides on factory 17-inch wheels, and most aftermarket multi-piston calipers are simply too big to clear them. Chase more clamping area and heat capacity, and you usually end up needing a flange spacer — or being told to buy 18-inch wheels first.
For a car that spends most of its life commuting, adding spacers just to make a caliper clear the wheel isn't a great trade-off — it changes offset, adds a failure point, and turns a brake upgrade into a wheel project. This A4 owner went a different route: a caliper designed to fit the stock wheel from the start.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Audi A4, factory 17-inch wheels |
| Front caliper | TTSPORT SL6 six-piston caliper |
| Front rotor | TTSPORT 330mm drilled rotor |
| Bracket | Custom vehicle-specific caliper bracket, no spacers |
| Pads / lines | TTSPORT performance brake pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts, and fitting hardware |
This install uses the TTSPORT Slim Series SL6 caliper, built specifically to work behind smaller OEM wheels. Its full spec sheet is below.
| Brake Caliper | |
|---|---|
| Series | Slim Series |
| Model / Application | SL6 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | One-piece heat-insulated pistons |
| Piston Diameter | 28 mm × 2 / 30 mm × 2 / 36 mm × 2 |
| Caliper Dimensions | L 350 mm × W 135 mm × H 120 mm |
| Total Piston Area | 46.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.60 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–355 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 82 |
| Caliper Mounting Type | Radial mount with vehicle-specific caliper brackets |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
Why It Works
Getting a six-piston caliper to clear a 17-inch wheel isn't about shrinking the caliper randomly — it's about rethinking the layout so clamping area stays high while the overall package stays compact enough for the wheel's spoke window. TTSPORT built the SL6 around that constraint, then tested it directly against the Audi A4's factory 17-inch wheel to confirm it clears with no flange or spacer.
- Six-piston, symmetric clamping delivers linear, predictable pedal response instead of a vague, progressively softening feel.
- Installs directly on the stock 17-inch wheel — no spacers, no flange adapters, and the factory track width and steering geometry stay untouched.
- The 330mm rotor and performance pad combination is tuned to feel normal in daily driving while adding real margin on highway braking or a long mountain descent.
For a daily-driver A4, that's the point: more braking confidence without turning the car into a wheel-and-suspension project.
Installation Gallery
Does the TTSPORT SL6 kit fit under the Audi A4's stock 17-inch wheels without spacers?
What's included in the TTSPORT SL6 kit for this Audi A4?
Does the upgrade change the A4's track width or steering geometry?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.