BMW 5 Series Big Brake Kit Upgrade / TTSPORT Classic 5440
This BMW 5 Series carries 245 hp, 350 N·m of torque, and a 0-60 time around six seconds — plenty of go for a car that felt soft on the pedal under hard braking. The fix here wasn't more power, it was more brake: a TTSPORT Classic 5440 forged four-piston front kit paired with 330x28mm rotors and stainless lines, installed under the car's stock 18-inch wheels.
Before the new hardware went on, the shop de-rusted and cleaned the hub face — a step that matters more than it sounds, since any grit or corrosion between the hub and rotor hat can throw off runout and cause pedal pulsation later. The fender liner was also trimmed to clear the larger rotor.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW 5 Series, 18-inch factory wheels |
| Front caliper | TTSPORT Classic 5440 forged four-piston caliper, star-profile racing pistons |
| Front rotor | TTSPORT 330mm x 28mm high-carbon, heat-treated rotor |
| Bracket | Vehicle-specific caliper mounting bracket |
| Pads / lines | TTSPORT brake pads, stainless steel brake lines |
| Hardware | Brake fluid and mounting hardware |
The Classic 5440 caliper used on this build carries the following factory specification:
| 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 |
Why It Works
The 5440 is a two-piece forged aluminum caliper — the body is pressed under roughly 3,000 tons of force, which packs the aluminum grain tighter than a cast caliper and cuts flex under hard pedal pressure. Less flex in the caliper means less of your pedal travel gets wasted just squeezing the caliper halves together, which is why drivers feel a firmer, more linear pedal right away.
- Star-profile pistons without dust boots run cooler and more evenly, which helps quiet the brake noise that stock calipers can develop as pads wear.
- A slim caliper profile keeps the body strong while leaving enough spoke clearance to fit behind the car's stock 18-inch wheels — no spacers needed.
- Stepping up to a 330x28mm rotor adds swept area and thermal mass over the stock disc, giving the system more capacity to absorb heat before it fades.
- The rotor's heat-treated coating resists everyday corrosion, and its curved vane design helps wipe accumulated dust off the friction surface as it spins.
Installation Gallery
FAQ
What wheel size does this BMW 5 Series TT5440 kit fit?
What comes in the TTSPORT Classic 5440 kit used on this build?
Did the installation require cutting or modifying anything?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.