Lotus Big Brake Kit Upgrade / TTSPORT Classic 5420
Lotus built this car to be light and fast — a 1,680 kg curb weight, a 3.5L V6 making 435 hp and 440 Nm, and a 3.7-second run to 60 mph. The factory brakes didn't hold up their end: a single-piston cast-iron caliper that the owner described as the soft spot on an otherwise razor-sharp car. TTSPORT's fix was a new TT5420 forged four-piston caliper kit paired with 285x24mm high-carbon heat-treated TY3 rotors and stainless steel brake lines, sized to work behind the car's original 15-inch wheels.
A single-piston caliper was never going to match a car with this power-to-weight ratio. TTSPORT built a forged four-piston kit around the Lotus's factory wheel size rather than asking the owner to size up.
Vehicle & Kit Specs
Here's the hardware breakdown for this build:
| Item | Specification |
|---|---|
| Vehicle | Lotus, 3.5L V6, 435 hp / 440 Nm, factory 15-inch wheels |
| Front caliper | TTSPORT TT5420 forged four-piston caliper |
| Front rotor | 285x24mm high-carbon heat-treated TY3 rotor |
| Bracket | Custom-engineered bracket, designed from 3D-scanned knuckle data |
| Brake lines | TTSPORT stainless steel brake lines |
Custom-Fit Engineering, Not Guesswork
Getting a four-piston caliper to clear a small 15-inch wheel isn't a matter of bolting on an off-the-shelf bracket. TTSPORT's team scanned the Lotus's front knuckle in 3D, built a digital model, and drafted a bracket specific to that geometry before cutting any metal. That step-by-step process — scan, model, draft, machine — is what let the TT5420 caliper tuck inside the stock wheel without spacers or a wheel change.
Before any bracket was cut, TTSPORT scanned the knuckle to capture the exact clearances involved — the only way to guarantee the finished caliper would clear the factory 15-inch wheel with no surprises.
Why It Works
- A forged four-piston fixed caliper clamps the pad more evenly than a single-piston floating design, which sharpens pedal feel and reduces uneven pad wear.
- The 285x24mm TY3 rotor adds mass and surface area over the stock disc, giving the system more heat capacity to resist fade under repeated hard stops.
- Stainless steel lines don't expand under pressure the way rubber lines do, so pedal input translates more directly into clamping force.
- Because the bracket was engineered from the actual knuckle geometry, the kit fits behind the car's factory 15-inch wheels — no spacers, no wheel swap.
Installation Gallery
Frequently Asked Questions
What was wrong with the Lotus's stock brakes?
What's in the TTSPORT TT5420 kit installed on this car?
Does the TT5420 kit fit behind the Lotus's factory wheels?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.