Lynk & Co 03 Big Brake Kit Upgrade / TTSPORT Slim SL6

The Lynk & Co 03 built its reputation on sport-tuned handling, and the 03+ pushed that further with real power to back it up. Push either car hard on a mountain road or a track day, though, and the factory brakes tell a different story — fade sets in fast, and the pedal starts to feel soft and inconsistent under repeated hard stops. This case documents a front-axle upgrade to the TTSPORT Slim SL6 six-piston kit, built specifically to solve that problem without touching the car's stock 18-inch wheels.

Most six-piston big brake kits demand a larger wheel or a flange spacer to clear the caliper — a real headache on a car that ships with 18-inch wheels from the factory. That fitment wall is exactly what kept a lot of 03 owners from upgrading in the first place.

Vehicle & Kit Specs

The build below is a front-axle-only upgrade, sized and shaped to clear the Lynk & Co 03's stock 18-inch wheel with no spacers or flanges.

Here's the official spec sheet for the TTSPORT SL6 caliper used in this build.

Getting a six-piston caliper to clear an 18-inch wheel took a compact bridge design and a reworked internal fluid path, tightening the caliper's footprint without cutting into piston area or rigidity. The result installs onto the stock wheel with no flange, no offset change, no compromise on the car's stance.

Why It Works

• Forged two-piece caliper construction resists flex under load, so the pedal stays firm and pressure at the caliper matches pressure at the pedal instead of getting absorbed by a flexing housing.
• Six pistons clamp the pad more evenly across its face than a smaller-piston OEM caliper, improving pad contact and giving more linear, predictable brake response.
• The larger 355mm rotor holds more heat before it starts to fade, which is what keeps repeated hard stops from turning into a soft, sinking pedal.
• Fitment geometry is purpose-built around the 03's factory 18-inch wheel, so there's no wheel swap, no spacer, and no ET adjustment to sort out.

The SL6 wasn't just scaled up on paper — the pad and piston sizing draws on race-brake tuning, aimed at balancing bite with control rather than just chasing bigger numbers. For a car that has to do daily commuting and canyon runs equally well, that balance matters more than outright peak clamping force.

With the rotor and caliper mounted, the stock wheel goes right back on — no clearance issues at the spokes, no rubbing, no visible gap that would give away a poor-fitting aftermarket setup.

Installation Gallery