Mercedes-Benz CLA Big Brake Kit Upgrade / TTSPORT Classic 8657

The Mercedes-Benz CLA pairs a 2.0L turbo four with genuinely quick acceleration, but its owner in this case wasn't satisfied with the factory brake feel. Looking to match the car's performance with brakes that could keep up, he settled on the TTSPORT 8657 forged six-piston caliper.

The CLA is a small, quick car with a reputation among hot-hatch and sport-sedan fans for punching above its weight. That kind of acceleration puts real demand on the brakes, and stock hardware on cars like this is built to a cost target, not a track target. The owner wanted a caliper and rotor combo that could handle repeated hard stops without the pedal going soft.

Vehicle & Kit Specs

The upgrade swaps the factory front brakes for a TTSPORT forged monobloc setup sized to run behind the CLA's factory 18-inch wheels.

Every piece of the 8657, from the caliper body to the mounting hardware, is forged rather than cast. Forging tightens the material's grain structure, which raises rigidity roughly 30% over a comparable cast caliper. That stiffness matters at the pedal: a caliper that flexes under clamping load wastes pedal travel and softens the feel, while a rigid body converts more of that pedal input directly into clamping force on the rotor.

Why It Works

• Forged construction resists flex and metal fatigue better than cast calipers, so clamping force stays consistent stop after stop.
• The six-piston layout spreads clamping pressure across a larger pad area, improving bite and control compared to the stock single or dual-piston setup.
• The larger 355x32mm rotor adds mass and surface area, giving the system more capacity to absorb and shed heat before fade sets in.
• The kit was installed and confirmed to clear the car's factory 18-inch wheels.

Installation Gallery