GAC GS5 Big Brake Kit Upgrade / TTSPORT Classic 5440
The Trumpchi GS5 is GAC's mid-size crossover, built on a chassis tuned with European input and rated five stars in C-NCAP testing — but the factory brake package on this 18-inch-wheel example still had the soft, long-travel pedal typical of a stock SUV setup. The owner swapped in a TTSPORT Classic 5440 four-piston big brake kit up front, paired with 330x28mm high-carbon heat-treated rotors and TTSPORT stainless steel lines, to get a firmer pedal and more consistent stopping power without touching the wheels.
The red 5440 caliper fills out the wheel opening noticeably compared to the stock unit, and the larger 330mm rotor leaves less empty space visible through the spokes — a straightforward visual and functional upgrade on an 18-inch wheel.
Vehicle & Kit Specs
Here's the hardware breakdown for this GS5 build:
| Item | Specification |
|---|---|
| Vehicle | Trumpchi (GAC) GS5, 18-inch wheels |
| Front caliper | TTSPORT Classic 5440, forged four-piston |
| Front rotor | TTSPORT 330x28mm high-carbon heat-treated, slotted and vented |
| Lines | TTSPORT stainless steel brake lines |
The table below is TTSPORT's official spec sheet for the 5440 caliper used in this build.
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 5440 |
| Axle Position | Front |
| Piston Count | 4-piston |
| Piston Type | Star-profile racing pistons without dust boots |
| Piston Diameter | 38 mm × 2 / 41 mm × 2 |
| Caliper Dimensions | L 276 mm × W 138 mm × H 80 mm |
| Total Piston Area | 49.1 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 2.65 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 17 in or larger |
| Recommended Rotor Size | Ø330–345 mm × 28 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 86 |
| 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 5440's two-piece forged aluminum body resists flex under hard pedal pressure, which is what a mushy stock caliper loses to first — that rigidity is what firms up the pedal. Four pistons (38mm x2, 41mm x2) spread 49.1 cm² of clamping area across the pad, giving more even pad contact than a smaller factory single- or twin-piston setup. The slotted rotor face and angled vane design in the 330x28mm rotor keep the rotor breathing under repeated braking, which helps push heat out instead of letting it build up in the pad and fluid.
- Forged two-piece caliper body cuts flex versus a stock floating caliper, translating pedal input directly into clamping force.
- 49.1 cm² of combined piston area spreads clamping force more evenly across the pad surface.
- With 86mm of minimum spoke clearance, the kit was confirmed to fit behind the GS5's existing 18-inch wheels using a vehicle-specific radial-mount bracket — no spacers.
Installation Gallery
FAQ
What wheel size does the TTSPORT 5440 kit fit on the GS5?
What does the TTSPORT 5440 kit include for the GS5?
How does the TT5440 caliper mount to the GS5?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.