The build: what's actually bolted on
| Item | Installed on this Z4 |
|---|---|
| Vehicle | BMW Z4 (G29) |
| Wheels fitted | 19-inch |
| Front caliper | Brembo GT6 six-piston |
| Rear layout | Dual-caliper setup |
| Rear braking caliper | Brembo GT4 four-piston |
| Rear parking brake | Separate electronic parking brake caliper |
| Front rotor | STOPFLEX 380mm carbon ceramic |
| Rear rotor | STOPFLEX 380mm carbon ceramic |
| Pads | STOPFLEX high-performance ceramic |
| Hardware | Matching bolts and install fasteners |
| Axle scope | Front and rear conversion |
This car runs 19-inch wheels, but wheel size alone doesn't prove the kit clears. Before you order, get inner barrel clearance, spoke profile, caliper clearance, rotor hat offset, rear dual-caliper room, and electronic parking brake placement all confirmed against your exact wheel.
What the 380mm CCB package changes
| STOPFLEX feature | Why it matters on a Z4 | What you notice |
|---|---|---|
| 380mm carbon ceramic rotors, both axles | The Z4 is a short, light roadster that feels every pound at the wheels. CCB rotors run about half the weight of same-size steel. | Lighter steering, quicker turn-in, brakes that wake up faster. |
| Long-fiber CCB construction | Back-road and canyon driving cooks iron rotors fast; heat saturation shows up as a soft, fading pedal. | Pedal stays firm stop after stop instead of going long on you. |
| Brembo GT6 front, GT4 rear braking calipers | The front axle does most of the stopping work; a six-piston clamp spreads pad pressure more evenly across a big rotor. | Stronger, more linear bite you can lean on with confidence. |
| STOPFLEX ceramic pads on CCB rotors | OEM-style pads dust heavily and bake the inside of nice wheels. | Wheels stay clean far longer; less time scrubbing brake dust. |
| Crackle-texture ceramic coating, rust-free face | A drop-top gets left out and rained on; steel rotors bloom orange overnight. | Clean rotor face behind the spokes, no rust after a wet week. |
What gets better
- Lower unsprung and rotating mass than same-size steel rotors
- Firm, repeatable pedal through repeated hard stops
- Much less brake dust with STOPFLEX pads
- No rust bloom on the rotor face after rain
- Serious brake hardware that fills out 19-inch wheels
What to confirm first
- Your exact Z4 variant and current brake layout
- Wheel inner barrel and spoke clearance over the GT6 caliper
- Rotor hat offset and 380mm rotor centering
- Rear dual-caliper room and electronic parking brake placement
- Pad compound matched to how you actually drive
If you're not sure your car matches the spec shown here, send us your wheel and variant details and we'll confirm BMW Z4 G29 fitment before you order through our BMW CCB collection.
Build gallery
FAQ
What brake parts went on this BMW Z4 G29?
Brembo GT6 six-piston front calipers, a rear dual-caliper setup using Brembo GT4 four-piston rear braking calipers plus separate electronic parking brake calipers, STOPFLEX 380mm carbon ceramic rotors front and rear, STOPFLEX ceramic pads, and matching installation hardware. The car runs 19-inch wheels.
Why put carbon ceramic brakes on a roadster like the Z4?
The Z4 is light and responds to weight at the corners. STOPFLEX carbon ceramic rotors weigh about half what a same-size steel rotor does, which cuts unsprung and rotating mass. They also hold heat better on a back road and, paired with STOPFLEX pads, throw far less dust onto the wheels.
How does the rear dual-caliper setup work?
It splits the two jobs. The Brembo GT4 four-piston caliper does the actual braking, and a separate electronic parking brake caliper handles the park function. You keep full electronic parking brake operation without asking one caliper to do both.
Does this 380mm STOPFLEX upgrade fit any Z4 on 19-inch wheels?
Not automatically. Wheel diameter alone doesn't confirm clearance. Inner barrel shape, spoke profile, caliper clearance, rotor hat offset, rear dual-caliper room, and parking brake placement all need to be checked against your exact wheel before you order.
Is this Z4 carbon ceramic setup okay for daily driving?
Yes, with the right pad compound, a proper bedding-in, confirmed wheel clearance, and clean installation. Day to day you get cleaner wheels, lighter rotors, no rust bloom after rain, and a firmer, more premium pedal.
