Honda Fit/Jazz (GK5) Big Brake Kit Upgrade / TTSPORT Classic 5420
The Honda Fit (GK5) has a well-earned reputation on autocross and track days — a 131 hp naturally aspirated engine in a sub-ton chassis, with a short wheelbase that rewards hard braking into corners. The problem is what's behind the wheels: a rear drum setup that traps heat and moisture, and stock brakes that reportedly need around 40 meters to stop from 100 km/h in independent testing. This build swaps in a TTSPORT front big brake kit and converts the rear from drum to disc.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Honda Fit / Jazz (GK5), fitted with 15-inch wheels |
| Front caliper | TTSPORT Slim TT5420 forged four-piston caliper |
| Front rotor | 295×24mm high-carbon, heat-treated curved (slotted) rotor |
| Rear caliper | TTSPORT single-piston caliper (drum-to-disc conversion) |
| Rear rotor | 280×9mm one-piece rotor |
| Lines / hardware | TTSPORT stainless steel brake lines and vehicle-specific mounting hardware |
Why It Works
The TT5420 is a split-body forged caliper built from high-strength aviation-grade aluminum rather than cast iron. Forging tightens the grain structure, which cuts down on flex under clamping load and reduces vibration at the pedal — the caliper is also lighter than a cast equivalent, trimming unsprung weight at each front corner.
- Curved-slot front rotor design helps clear brake dust so pad bite stays consistent lap after lap.
- Rear drum-to-disc conversion swaps a design that traps heat and water for a one-piece rotor with better cooling and more linear pedal response.
- Kit was developed around the Fit's factory dimensions and fits under the car's 15-inch wheels.
Installation Gallery
FAQ
What does the TTSPORT kit include for the Honda Fit GK5?
Will this kit fit under the stock 15-inch wheels?
Why convert the rear drum brakes to discs?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.