Honda Fit/Jazz (GK5) Big Brake Kit Upgrade / TTSPORT Classic 5040

Not every GK5 build is about wide fenders and a loud exhaust. This Honda Fit owner went the other way — a plain white GK5 riding on its factory 15-inch wheels, with the only real change hiding behind the spokes: a gray TTSPORT TT5040 big brake kit that nobody clocks until they look twice.

The stock Fit's single-piston sliding caliper and thin rotor work fine for daily driving, but they run out of margin fast under repeated hard stops — the pedal goes long and soft, and the car needs more distance to slow down. This owner swapped in a TTSPORT TT5040 fixed four-piston caliper paired with a 285x24.5mm Dacromet curved-vane rotor and stainless steel lines, all sized to clear the GK5's factory 15-inch wheels.

Vehicle & Kit Specs

The gray caliper color was picked on purpose — it doesn't fight for attention against the white paint. From most angles the car reads as a stock GK5. The owner clearly wanted the money to go into function, not into a caliper color that shouts.

Why It Works

• A fixed four-piston caliper clamps from both sides with less flex than a stock single-piston slider, which tightens up pedal feel and makes brake response more consistent stop after stop.
• The larger 285x24.5mm rotor carries more thermal mass than the factory disc, so it absorbs and sheds heat better before fade sets in.
• Stainless steel lines resist the ballooning that rubber lines can suffer under hard braking, keeping pedal pressure firm instead of spongy.
• The kit is sized to clear the GK5's stock 15-inch wheels, so the upgrade goes on without changing the car's factory look.

Installation Gallery