Audi A6L Big Brake Kit Upgrade / TTSPORT Classic 5440
The Audi A6L's stock brakes are tuned for daily comfort, not for backing up the car's strong, composed powertrain when you're pushing harder. This install swaps in a TTSPORT front big brake kit and a rear big-rotor package built for the A6L's factory 17-inch wheels — no spacers, no cutting.
The build: a TT5440 forged four-piston caliper and 330x28mm high-carbon drilled rotor up front, plus a TTSPORT 330x12mm oversized rotor and stainless brake lines out back — all fitted to the A6L's 17-inch wheels.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Audi A6L, 17-inch wheels |
| Front caliper | TTSPORT TT5440 forged four-piston big brake caliper |
| Front rotor | 330x28mm high-carbon, heat-treated drilled rotor |
| Rear rotor | TTSPORT 330x12mm oversized rotor |
| Rear lines | TTSPORT stainless steel brake lines |
The TT5440 is one of TTSPORT's better-known front calipers. Here's the official spec sheet for the caliper used on this build:
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 5440 |
| Axle Position | Front |
| Piston Count | 4-piston |
| Piston Type | Star-profile racing pistons without dust boots |
| Piston Diameter | 38 mm × 2 / 41 mm × 2 |
| Caliper Dimensions | L 276 mm × W 138 mm × H 80 mm |
| Total Piston Area | 49.1 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 2.65 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–345 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 86 |
| 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 |
With the caliper mounted, the front suspension shows how the TT5440 sits inside the factory strut and knuckle geometry — no trimming or relocation brackets needed beyond the vehicle-specific bracket included in the kit.
Why It Works
- A forged, two-piece aluminum caliper body flexes less under hard braking than the stock caliper, so pedal input translates more directly into clamping force instead of getting absorbed by caliper flex.
- The 330x28mm front rotor and 330x12mm rear rotor add mass and surface area over the factory discs, giving the system more thermal capacity to resist fade during repeated hard stops.
- The TT5440's 17-inch wheel rating and the rear rotor's direct-fit dimensions mean the kit bolts up to the A6L's existing wheel setup — no spacers, no OEM data mismatch.
- Stainless steel brake lines on the rear resist the ballooning that rubber lines can develop under pressure, keeping pedal feel firm and consistent.
Installation Gallery
Does the TTSPORT TT5440 kit fit 17-inch wheels on the Audi A6L?
What rotor size does the TT5440 front kit use on the A6L?
What was upgraded on the rear axle of this Audi A6L?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.