Audi A3 Big Brake Kit Upgrade / TTSPORT Classic 5430
The stock front brakes on this Audi A3 had the usual complaint: a pedal that goes soft after a few hard stops and doesn't inspire much confidence at speed. The owner went with a TTSPORT 5430 Classic Series big brake kit up front — a forged four-piston caliper setup designed to bolt in with a vehicle-specific bracket, no spacers, and no cutting.
Vehicle & Kit Specs
Here's the hardware breakdown for this build before we get into the official product spec sheet.
| Item | Specification |
|---|---|
| Vehicle | Audi A3, front axle upgrade |
| Front caliper | TTSPORT 5430, Classic Series forged four-piston caliper |
| Front rotor | Compatible with Ø330–355 mm x 28 mm rotors |
| Bracket | Vehicle-specific radial-mount caliper bracket |
| Pads / lines | Performance pads matched to the caliper, plus caliper-specific line fittings |
| Hardware | Mounting hardware included |
Below is the full TTSPORT 5430 spec sheet for reference.
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Axle Position | Front |
| Piston Count | 4-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 38 mm × 2 / 41 mm × 2 |
| Caliper Dimensions | L 282 mm × W 152 mm × H 77 mm |
| Total Piston Area | 49.1 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.20 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) | 95 |
| 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
A soft pedal on a stock setup is usually a caliper flex problem as much as anything else — the caliper body deforms slightly under load, so the pads move before the rotor actually gets clamped hard. Swapping to a stiffer caliper body changes that math.
- Two-piece forged aluminum construction resists flex better than a cast single-piece caliper, so pedal input translates more directly into clamping force.
- Four pistons with a combined 49.1 cm² of area spread clamping force across more of the pad, which helps even pad wear and consistent bite.
- Heat-insulated two-piece pistons help slow heat transfer from the pads back into the brake fluid, which matters for holding a firm pedal after repeated hard stops.
- The radial-mount, vehicle-specific bracket is built to the A3's geometry, so the kit installs without spacers.
Fitment Notes
The 5430 is designed for wheels of 17 inches or larger, with a minimum spoke clearance of 95 mm — worth checking against your specific wheel before ordering, since spoke design varies even within a 17-inch wheel size. Because the bracket and line fittings are vehicle-specific, the kit is set up to bolt to the A3's factory hub and knuckle without any modification.
Installation Gallery
Frequently Asked Questions
What caliper does the TTSPORT 5430 kit use on the Audi A3?
What wheel size do I need to run this kit?
Does the 5430 kit require special brackets or fittings?
Need fitment confirmation? Send us your A3's wheel size and intended use before ordering, and we'll help you dial in the right kit.