GAC E8 Big Brake Kit Upgrade / TTSPORT Slim SL6
The GAC Trumpchi E8 is a family-focused MPV — big cabin, quiet ride, easy commuting. But its stock 18-inch wheels leave almost no room behind the spokes, which is exactly why most aftermarket big brake kits won't fit without a flange adapter or wheel spacer. This case documents a TTSPORT SL6 six-piston front kit built specifically around that clearance problem, installed with no spacers and no structural changes.
Most off-the-shelf big brake kits interfere with the E8's wheel barrel or require a flange spacer to clear the spokes — a workaround that changes wheel offset and isn't something most owners want on a family vehicle. TTSPORT engineered the SL6 kit around the E8's actual wheel geometry instead of forcing a generic caliper to fit.
Vehicle & Kit Specs
Here's what went on the car, front axle only, alongside the factory 18-inch wheels.
| Item | Specification |
|---|---|
| Vehicle | GAC Trumpchi E8, stock 18-inch wheels |
| Front caliper | TTSPORT SL6 six-piston caliper |
| Front rotor | TTSPORT 355mm high-carbon curved rotor |
| Bracket | Custom vehicle-specific caliper bracket |
| Pads / lines | TTSPORT high-performance brake pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts and fasteners |
Every dimension in this kit — caliper width, rotor diameter, bracket offset, brake line routing — was worked out around the E8's stock hub and 18-inch wheel, not adapted from an unrelated platform afterward.
Below is the full spec sheet for the TTSPORT SL6 caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Slim Series |
| Model / Application | SL6 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | One-piece heat-insulated pistons |
| Piston Diameter | 28 mm × 2 / 30 mm × 2 / 36 mm × 2 |
| Caliper Dimensions | L 350 mm × W 135 mm × H 120 mm |
| Total Piston Area | 46.8 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.60 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–355 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 82 |
| 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
The SL6's two-piece forged aluminum body resists the flex that a factory single- or twin-piston sliding caliper can't avoid under hard, repeated braking — that rigidity is what keeps pedal feel consistent instead of going soft after a few stops.
- Six-piston clamping and a 46.8 cm² total piston area spread force more evenly across the pad, increasing usable friction area versus the stock brake.
- The 355mm rotor carries more mass than the factory disc, which means more heat capacity — useful when the E8 is loaded up, running down a long grade, or braking repeatedly in traffic.
- Every part — caliper, bracket, rotor diameter, line routing — was sized to the E8's stock 18-inch wheel and hub, so it clears the spokes without a flange spacer or offset change.
- Braided stainless lines don't expand under heat the way rubber lines do, so pedal travel stays short and predictable instead of getting spongy as the brakes work harder.
With the caliper and rotor sized to clear the stock wheel outright, the E8 keeps its original wheel offset and suspension geometry — nothing about the car's handling or alignment changes just because the brakes got bigger.
Installation Gallery
Does the TTSPORT SL6 kit fit the GAC Trumpchi E8's stock 18-inch wheels without spacers?
What's included in the TTSPORT SL6 big brake kit for the E8?
Is this a front-axle upgrade or a full four-wheel kit?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.