Kia K5 Big Brake Kit Upgrade / TTSPORT Classic 5440
The Kia K5 doesn't get much love in the tuning world, and the factory brakes are one of the reasons why — single-piston sliding calipers and thin rotors that feel adequate on paper but go soft fast under real driving. This K5 owner kept the stock 18-inch wheels and swapped in a TTSPORT Classic 5440 four-piston big brake kit, picking up real pad area and rotor mass without touching wheel fitment.
The build stays modest on paper — same 18-inch wheels, same suspension — but the caliper and rotor swap changes how the car actually stops. That's the whole point of an OEM+ brake upgrade: more hardware doing the work, not a louder look.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Kia K5, factory 18-inch wheels |
| Front caliper | TTSPORT Classic 5440, forged four-piston fixed caliper |
| Front rotor | TTSPORT 330x28mm Dacromet-coated curved-vane rotor |
| Lines | TTSPORT stainless steel brake lines |
Below is the full spec sheet for the TTSPORT 5440 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
- A forged two-piece fixed caliper flexes far less under pedal pressure than the stock single-piston slider, so more of the driver's input goes into clamping force instead of caliper body deflection.
- Four pistons with 49.1 cm² of combined area spread clamping force across a wider pad, cutting the mushy, long-travel feel that comes from the factory brake's single piston pushing on one side.
- The 330x28mm rotor and 5440 caliper are sized to clear the factory 18-inch wheel with no spacers, so the upgrade doesn't force a wheel change or offset adjustment.
- Stainless steel lines replace the factory rubber hoses, cutting the line expansion that adds sponginess to the pedal under hard, repeated braking.
This owner went with the red-finish TT5440, a popular pick heading into the holiday season Paired with the white K5 body and the 330mm rotor filling out the wheel opening, it's a straightforward look-and-function upgrade on a car that doesn't get many of them.
Installation Gallery
FAQ
Does this TTSPORT big brake kit fit the Kia K5's factory 18-inch wheels?
What's included in this Kia K5 brake kit?
What color options were used on this build?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.