BMW 5 Series Big Brake Kit Upgrade / TTSPORT Classic 8657
This BMW 5 Series carries a strong 2.0T drivetrain and a chassis that already handles well — flat through corners, quiet, composed over bad pavement. The one weak link on a car that can move this fast is the factory brake package, which starts to feel soft and inconsistent once you actually drive it hard. The owner went with a full four-corner TTSPORT big brake kit built around a six-piston forged front caliper, a four-piston forged rear caliper, and an electronic parking brake module so the factory auto-hold function wasn't lost in the process.
The kit is a competition-gray forged setup sized for 18-inch and larger wheels — a six-piston TT8657 caliper up front and a four-piston TT8901 caliper in back, both running TTSPORT's 355mm curved rotors.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW 5 Series, 18-inch wheels and larger |
| Front caliper | TTSPORT TT8657 six-piston forged caliper, competition-gray finish |
| Front rotor | TT355x32mm curved rotor with Dacromet anti-corrosion coating |
| Rear caliper | TTSPORT TT8901 four-piston forged caliper |
| Rear rotor | TT355x28mm curved rotor |
| Parking brake | TTSPORT electronic parking brake actuator kit, retains OEM auto-hold/handbrake function |
| Lines | TTSPORT stainless steel brake lines |
Why It Works
A forged, fixed six-piston caliper doesn't flex under load the way a stock sliding caliper does, so pedal input translates into clamping force more directly — that's what turns a soft, long-travel pedal into a firm one. The larger 355mm front rotor also carries more mass and surface area than the factory disc, which means it can absorb and shed more heat before fade sets in.
- Curved rotor pattern helps clear pad debris off the disc face for cleaner, more consistent contact
- Dacromet coating resists corrosion, so the rotors hold up better over time than untreated discs
- Kit clears 18-inch and larger wheels with no spacers required
- Rear caliper pairs with a TTSPORT electronic parking brake module, so the upgrade doesn't cost you the factory handbrake feature
Installation Gallery
FAQ
What wheel size does this TTSPORT big brake kit fit on the BMW 5 Series?
Does the rear kit keep the factory electronic parking brake working?
What is the Dacromet coating on the front rotors for?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.