BMW X5 (G18) Big Brake Kit Upgrade / TTSPORT Evolution EB8
The BMW X5 (G18) is one of BMW's heaviest, most muscular SUVs — whether it's the 3.0L inline-six xDrive40i or the V8 M50i, there's real weight and real power to slow down. On the highway or in stop-and-go city traffic, the factory brakes are "adequate," but they're not what you'd call composed. This case, from Hangzhou M Garage, swaps the stock setup for a TTSPORT Evolution Series EB8 big brake kit up front and a rotor upgrade out back.
A heavier vehicle means more kinetic energy the brakes have to absorb every time you stop. On the X5, repeated hard braking or a long downhill run brings on noticeable heat fade and longer stopping distances with the factory setup. The stock calipers also look thin behind the wheel — they don't match the SUV's size or presence.
TTSPORT's answer: an eight-piston EB8 caliper up front for more even, more responsive clamping force, paired with a larger 370mm rear rotor at the stock caliper location for better front-to-rear balance and a more stable braking attitude overall.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW X5 (G18), 21-inch wheels |
| Front caliper | TTSPORT EB8 forged eight-piston caliper (Evolution Series) |
| Front rotor | TTSPORT 405mm high-carbon rotor |
| Rear rotor | TTSPORT 370mm high-carbon rotor, upgraded size at stock caliper mount |
| Bracket | Vehicle-specific caliper bracket |
| Pads / lines | TTSPORT high-performance pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
Below is the full spec sheet for the front EB8 caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Evolution Series |
| Model / Application | EB8 |
| Axle Position | Front |
| Piston Count | 8-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 28 mm × 4 / 32 mm × 4 |
| Caliper Dimensions | L 349 mm × W 166 mm × H 98 mm |
| Total Piston Area | 56.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 4.95 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 19 in or larger |
| Recommended Rotor Size | Ø380–405 mm × 34 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 107 |
| Caliper Mounting Type | Radial mount with vehicle-specific caliper brackets |
| Brake Line Fitting Type | Vehicle-specific fittings; caliper-side and chassis-side fittings vary by application |
The kit is built specifically for the G18 chassis: eight-piston EB8 calipers and 405mm rotors up front, a 370mm high-carbon rotor at the rear using the factory caliper location, plus a matched caliper bracket, pads, stainless lines, fluid, and mounting hardware — everything needed for a complete front-and-rear brake upgrade.
Why It Works
- Forged, two-piece EB8 body with a symmetrical eight-piston layout distributes clamping force evenly across the pad, giving a bite that's sharp off the top of the pedal but stays linear and controllable further into the stroke.
- The 405mm front rotor adds swept area and thermal mass over the stock disc, which matters directly on a heavy SUV where repeated hard stops or long descents generate more heat to dissipate.
- Two-piece heat-insulated pistons with high-temperature seals keep fluid temperatures more stable and are built to pair cleanly with carbon-ceramic rotors.
- Stepping the rear up to a 370mm high-carbon rotor at the factory caliper mount brings rear stopping power closer in line with the new front end, improving overall balance and braking attitude instead of just adding power up front.
- Fitted and verified behind the vehicle's 21-inch wheels with no spacers required.
Installation Gallery
Frequently Asked Questions
What does the TTSPORT kit for the BMW X5 G18 include?
Does this kit fit behind the stock 21-inch wheels?
How many pistons does the TTSPORT EB8 caliper use?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.