Honda Fit/Jazz (GK5) Big Brake Kit Upgrade / TTSPORT Classic 5040S
The third-generation Honda Fit (GK5) has a well-earned reputation on track days from Zhuhai to Zhaoqing — its 1.5L naturally aspirated Earth Dreams engine puts out 131 hp, which is plenty for a car weighing just over a ton with a short wheelbase and a chassis that rewards hard driving. The brakes, though, don't keep up: stock 100-0 km/h stopping distance runs 41 meters, a number that doesn't match the rest of the car. This case covers a GK5 upgraded with a TTSPORT TT5040S four-piston front kit and a rear drum-to-disc conversion.
Wheel size on this build is 15 inches — small enough that a lot of big brake kits simply won't clear. The TT5040S was picked specifically because its caliper body is compact enough to fit behind small wheels without rubbing.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Honda Fit, 3rd generation (GK5), 15-inch wheels |
| Front caliper | TTSPORT TT5040S four-piston caliper, compact body for small-wheel fitment |
| Front rotor | TTSPORT 285mm x 24mm high-carbon heat-treated curved-slot two-piece rotor |
| Rear conversion | Drum-to-disc conversion with single-piston caliper |
| Rear rotor | TTSPORT 260mm x 9mm high-carbon heat-treated curved-slot rotor |
| Hardware | TTSPORT stainless steel brake lines |
Why It Works
Swapping the stock single-piston front caliper for the TT5040S four-piston unit spreads clamping force across more pad area, which firms up pedal feel and cuts response lag. Pairing it with the larger 285mm two-piece rotor adds rotor mass and surface area, giving the system more heat capacity before fade sets in.
- Four-piston front caliper replaces the stock single-piston unit for more even clamping and a firmer pedal.
- 285x24mm two-piece front rotor and 260x9mm rear rotor add mass and surface area for better heat handling.
- Compact TT5040S caliper body is sized to clear the factory 15-inch wheels without an upsize.
- Curved-slot rotor pattern wipes surface debris from the pad contact area, and the venting helps the rotors shed heat.
- Rear drum-to-disc conversion swaps a self-adjusting drum for a solid rotor, which is easier to inspect and maintain.
Installation Gallery
Frequently Asked Questions
Does the TTSPORT TT5040S kit fit under the GK5 Fit's factory 15-inch wheels?
What does the rear brake upgrade include?
What rotors are used front and rear?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.