Subaru Forester Big Brake Kit Upgrade / TTSPORT Classic 5440
The Subaru Forester runs a boxer engine and full-time symmetrical AWD as standard — a drivetrain layout that keeps weight low and traction even, but also means the stock brakes are working against a heavier, torque-split platform every time the pedal gets pressed hard. This case swaps in a TTSPORT Classic Series big brake kit built around the TT5440 four-piston caliper.
The build pairs the TT5440 forged four-piston caliper with a TT 330x28mm Dacromet-coated slotted rotor and TTSPORT stainless steel brake lines — a straightforward front-axle upgrade over the factory setup, using hardware matched to the Forester's hub and knuckle.
Vehicle & Kit Specs
Here's the hardware breakdown for this Forester install:
| Item | Specification |
|---|---|
| Vehicle | Subaru Forester, symmetrical AWD boxer platform |
| Front caliper | TTSPORT 5440 forged four-piston caliper, Classic Series |
| Front rotor | TTSPORT 330x28mm Dacromet-coated slotted rotor |
| Bracket | Vehicle-specific caliper bracket matched to Forester hub geometry |
| Lines | TTSPORT stainless steel brake lines |
| Hardware | Forged mounting bolts included with the kit |
Below is the full official spec sheet for the TT5440 caliper 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 |
Why It Works
The TT5440's two-piece forged aluminum body is stiffer than a stock sliding caliper, so clamping force goes into the pads instead of flexing the caliper housing — that's what firms up pedal feel under hard braking. The 330x28mm rotor adds rotor mass over the factory disc, giving the system more thermal capacity to resist fade on longer, harder stops. The Dacromet coating on the rotor is a corrosion-resistant finish, which matters on a platform that sees plenty of wet and salted-road use.
- Forged four-piston caliper body resists flex for a firmer, more consistent pedal
- 330x28mm slotted rotor adds heat capacity over the stock disc
- Vehicle-specific bracket keeps the caliper fitted correctly to the Forester hub
Installation Gallery
What brake kit was installed on this Subaru Forester?
Does the TT5440 kit need special wheels or spacers to fit the Forester?
What does the Dacromet coating on the rotor do?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.