GAC GS8 Big Brake Kit Upgrade / TTSPORT Slim SL8
The Trumpchi GS8 has always been GAC's flagship statement in size and presence — a big, confident SUV built for families that expect road authority to match curb weight. But that same mass works against the brakes: hard stops from highway speed or with a full load tend to feel soft, and the pedal doesn't always inspire confidence when it matters most.
Making things trickier, the GS8's factory 20-inch wheels look great but leave little room to work with. Most six- or eight-piston big brake kits on the market need a flange adapter — or a different wheel altogether — to clear the spokes, which adds cost and complicates the install.
The Fitment Problem Behind the Big Wheels
This owner had looked at several upgrade paths before landing on TTSPORT. The common issue: bolt-on big brake kits sized for the GS8's power and weight almost always required a flange spacer to clear the OEM 20-inch wheel, which changes the wheel's offset and adds another mechanical interface to maintain.
The TTSPORT Slim Series was built specifically for cases like this: a high-strength, ultra-thin big-piston caliper designed to clear factory wheel spokes without a flange, so the wheel's original offset and geometry stay untouched.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | Trumpchi GS8, factory 20-inch wheels |
| Front caliper | TTSPORT SL8 eight-piston caliper (Slim Series) |
| Front rotor | TTSPORT 405mm rotor |
| Bracket | Vehicle-specific custom caliper bracket |
| Pads / lines | TTSPORT performance brake pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
Below is the full official spec sheet for the TTSPORT SL8 caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Slim Series |
| Model / Application | SL8 |
| Axle Position | Front |
| Piston Count | 8-piston |
| Piston Type | One-piece heat-insulated pistons with dust boots |
| Piston Diameter | 28 mm × 4 / 32 mm × 4 |
| Caliper Dimensions | L 391 mm × W 128 mm × H 144 mm |
| Total Piston Area | 56.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 5.20 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) | 90 |
| 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 |
Why It Works
- Eight pistons across the caliper distribute clamping force more evenly across the pad, which shortens response time and reduces pedal travel.
- A larger 405mm rotor adds mass and swept area, giving the system more thermal capacity for long descents and repeated hard stops.
- A larger pad contact area spreads friction more linearly, so braking force stays predictable instead of spiking or fading under load.
- The Slim Series geometry clears the GS8's factory 20-inch spokes without a flange adapter, keeping the wheel's stock offset intact.
Together, that adds up to a firmer, more predictable pedal for a heavy SUV — without touching the wheels or adding adapter hardware that can loosen or wear over time.
Installation Gallery
Does the TTSPORT SL8 kit fit under the GS8's stock 20-inch wheels?
What's included in this GS8 front brake kit?
Is this kit installed on the front axle only?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.