WEY Blue Mountain Big Brake Kit Upgrade / TTSPORT Slim SL8
Since its launch, the WEY Blue Mountain has carried the banner of China's premium new-energy SUV segment — big cabin, smart tech, and, more recently, serious dual-motor power. As output and curb weight climbed, some owners started to notice something the spec sheet doesn't advertise: the factory brakes were running out of headroom.
Owners of this platform tend to be practical rather than flashy about upgrades. What they wanted wasn't a race-car look — it was a caliper that could match the SUV's power and weight without forcing a wheel swap or spacers.
The Problem: More Motor, Same Pedal
The requirements this owner brought to the shop were specific: keep the factory 20-inch wheels with no cutting and no spacers, step up to a multi-piston caliper sized for the vehicle's mass, chase weight savings and heat stability at the rotor, and do it all without wrecking daily-driving comfort or NVH. That rules out a generic bolt-on kit — it calls for hardware engineered around this exact hub and wheel package.
Vehicle & Kit Specs
The front axle gets a TTSPORT SL8 eight-piston caliper matched with a vehicle-specific bracket and a 405mm carbon-ceramic rotor — sized and profiled to clear the stock wheel without a flange or adapter.
| Item | Specification |
|---|---|
| Vehicle | WEY Blue Mountain SUV, factory 20-inch wheels, direct-fit — no spacers required |
| Front caliper | TTSPORT SL8 forged eight-piston caliper |
| Front rotor | 405mm LCCB carbon-ceramic rotor |
| Bracket | Custom vehicle-specific caliper bracket, direct-mount to the factory hub |
| Pads / lines | High-performance carbon-ceramic brake pads; TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts, and fasteners |
Below is the official TTSPORT SL8 caliper spec sheet for the exact 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
A forged two-piece caliper body flexes less under load than a cast single-piece unit, so more of the pedal input goes into clamping force instead of caliper distortion — that's what gives the pedal a firmer, more linear feel. The eight-piston symmetrical layout also spreads clamping pressure more evenly across the pad, which helps the front end bite consistently instead of biasing to one side.
- Carbon-ceramic rotor mass is lower than a comparable steel disc, cutting unsprung weight at each corner and helping the suspension react faster over rough pavement.
- Carbon-ceramic material resists fade under repeated hard stops better than steel, which matters when a heavy dual-motor SUV is scrubbing speed from highway numbers back to back.
- The caliper and bracket are sized to clear the Blue Mountain's stock 20-inch wheel, so there's no spacer, no offset change, and no compromise to factory ride geometry.
None of this changes the SUV's factory look — the wheels stay stock, the ride stays the same — but the braking reserve is now sized to match the power under the hood.
Installation Gallery
FAQ
Does the TTSPORT SL8 kit fit the WEY Blue Mountain's factory 20-inch wheels without spacers?
What's included in this TTSPORT SL8 big brake kit?
What rotor size pairs with the SL8 caliper on this build?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.