BMW 3 Series (E90) Big Brake Kit Upgrade / TTSPORT Classic 9040

A BMW 325 is supposed to feel planted and precise, but the factory brakes on this E90 were falling short of the chassis underneath them — soft pedal, no real bite when it counted. The owner wanted to keep the car's comfort-oriented daily manners while restoring the sharper, more confident pedal that a 3 Series should have. The fix: a TTSPORT front six-piston / rear four-piston big brake kit, with the added benefit of a rear caliper that keeps the electronic parking brake fully functional.

Up front, the car gets a TTSPORT TT9040 six-piston fixed caliper paired with a 355x32mm high-carbon, heat-treated cross-drilled rotor. It's a kit that's earned a solid track record across a wide range of platforms, both in owner feedback and in how consistently it fits without drama — and it's available in a range of caliper finishes for owners who want to match their build.

Vehicle & Kit Specs

Why It Works

A stock caliper flexes under hard pedal pressure, and that flex is exactly what shows up as a soft, vague pedal feel. A fixed multi-piston caliper — six pistons up front, four in back — clamps the pad evenly across a larger contact area and resists that flex, so pedal effort translates directly into clamping force instead of getting absorbed by the caliper body.

Bigger rotors matter for the same reason bigger radiators matter: more mass and surface area to absorb and shed heat, which is what keeps braking consistent instead of fading as the pads and rotors heat up during repeated hard stops.

Out back, the TT6411 four-piston caliper runs alongside a dedicated EPB caliper to keep the electronic parking brake working exactly as it did from the factory, matched to a 345x28mm heat-treated cross-drilled rotor. A good brake upgrade shouldn't demand the driver stomp on the pedal at the limit — it should respond proportionally, whether that's a light tap in traffic or a full commitment stop, the same way a well-tuned throttle responds to a light or heavy foot.

• Six-piston front caliper spreads clamping force for a firmer, more linear pedal
• Larger 355mm/345mm rotors add heat capacity front and rear versus stock
• Rear caliper retains the factory EPB function, so nothing about parking brake operation changes
• Confirmed to clear the car's stock 18-inch wheels front and rear

Tucked behind the factory 18-inch spokes, the front six-piston caliper and 355mm rotor combo leaves plenty of clearance with no spacers or wheel changes required — a straightforward bolt-on for owners who want more stopping power without altering the car's stance or offset.

Installation Gallery

FAQ