BMW 1 Series Big Brake Kit Upgrade / TTSPORT Classic 5440
A BMW 1 Series owner had a familiar complaint: the factory brakes felt worn out under hard stops, and rain made things worse — that vague, "am I actually slowing down" feeling at the pedal. The fix didn't require new wheels or a track-day budget. TTSPORT installed its Classic 5440 front big brake kit, a forged four-piston setup built specifically for 2.0T-and-under BMWs running 17- or 18-inch wheels.
The finished install sits comfortably behind the car's 17-inch wheels. No spacers, no wheel swap — just a caliper and rotor package sized to fit the existing fitment.
Vehicle & Kit Specs
Here's the hardware that went on this BMW 1 Series, front axle only.
| Item | Specification |
|---|---|
| Vehicle | BMW 1 Series, under 2.0T displacement, factory 17-inch wheels |
| Front caliper | TTSPORT Classic 5440 two-piece forged four-piston caliper |
| Front rotor | 330 x 28mm high-carbon heat-treated slotted rotor |
| Bracket | Vehicle-specific radial-mount caliper bracket |
| Lines | TTSPORT stainless steel braided brake lines |
Below is the full published spec sheet for the TTSPORT 5440 used in 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 |
The 5440's body is a two-piece forged aluminum shell, not cast — that's the difference between a caliper that flexes under load and one that stays rigid, which is a big part of why the pedal feels firmer right off the bat.
Why It Works
None of this is magic — it's just bigger, stiffer hardware doing the job the factory single-piston floating caliper was never sized for.
- A forged, two-piece four-piston caliper resists flex under hard braking, so pedal pressure translates directly into clamping force instead of getting absorbed by a caliper body bending.
- The 330x28mm high-carbon heat-treated rotor carries more thermal mass than the stock disc, which helps it shed heat instead of fading during repeated hard stops.
- The kit is engineered for 17-inch-and-up wheel fitment, so this owner didn't need to change wheels or run spacers to make the caliper clear the spokes.
- Stainless steel lines replace the factory rubber hoses, cutting down on line expansion under pressure so pedal travel stays more consistent, stop after stop.
Installation Gallery
Will the TTSPORT 5440 kit fit behind stock 17-inch wheels on a BMW 1 Series?
What does the TTSPORT 5440 kit include?
Why did the owner upgrade the brakes on this BMW 1 Series?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.