Technology and advantages
What is a split disk and why choose one?
A Two-piece brake discs, also called a floating or 2 piece brake disc, is made up of two separate elements:
The central bell (or "bell"), usually made of aluminium alloy (Ergal or similar);
The external braking band, made of high-strength steel.
These two elements are joined by floating bushings or special screws, allowing (in the first case) a certain degree of relative movement between the components.
These fasteners allow the disc to thermally expand in a controlled manner, reducing stress and warpage.
This technology is taken directly from motorsport: split discs are used in racing cars, GT cars, track days and even in aftermarket high-performance braking systems.
They are designed to:
- Better resist thermal fatigue;
- Offer greater modularity in braking;
- Allow replacement of the brake band only
- Reduce unsprung masses, improving the car's response.
The split disc is a specific technical choice, not an aesthetic upgrade.
If you're looking for real braking performance, especially on tuned or track-only cars, the split disc is the ultimate solution.
It is chosen by trainers and enthusiasts for its consistent performance even under stress.
During heavy use, traditional discs can warp or vibrate due to high temperatures.
The split disc isolates the bell from the braking surface, reducing heat transfer to the hub and transmission components.
It's the smart choice for those who often ride on the track or need to maintain the highest technical level.
Another major advantage is the reduction of unsprung masses:
An aluminum bell weighs much less than a monolithic steel disc, which improves suspension response and steering, making the car more precise.
At ProTech Engineering, we design two-piece discs with the possibility of total customization.
- Custom fit for your brake caliper (OEM or racing);
- With customized bells and specific offsets for each system;
We can complement this with custom braided hoses and adapter brackets to create a complete, technically advanced braking system on request.