Zeekr 001 Big Brake Kit Upgrade / TTSPORT Classic 8657S
Even the higher-output versions of today's EVs often ship with multi-piston calipers up front, but plenty of standard trims — including this Zeekr 001 — still roll off the line with a floating cast-iron caliper. That setup handles daily commuting fine, but it runs out of margin once you start driving harder or carrying more speed into corners: pedal feel goes soft, and the single-piston clamp struggles to keep up with repeated hard stops.
The owner went with a TTSPORT Classic Series 8657S front big brake kit to close that gap — a forged six-piston caliper matched to a larger 405mm carbon rotor, built to bolt in without touching the factory 21-inch wheels.
Vehicle & Kit Specs
Here's exactly what went on the car, front axle only.
| Item | Specification |
|---|---|
| Vehicle | Zeekr 001, 21-inch factory wheels |
| Front caliper | TTSPORT 8657S forged six-piston caliper |
| Front rotor | TTSPORT 405mm high-carbon brake rotor |
| Bracket | Custom vehicle-specific caliper bracket |
| Pads / lines | TTSPORT high-performance brake pads, stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts, and fixing hardware |
The 8657S is TTSPORT's street-focused big performance caliper, so here's the full spec sheet for the exact unit used on this build.
| Brake Caliper | |
|---|---|
| Series | Classic Series |
| Model / Application | 8657S |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 30 mm × 2 / 34 mm × 2 / 38 mm × 2 |
| Caliper Dimensions | L 350 mm × W 165 mm × H 92.64 mm |
| Total Piston Area | 55.0 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 4.05 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 18 in or larger |
| Recommended Rotor Size | Ø355–405 mm × 32–34 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 8657S is built as a two-piece forged aluminum body with a machined, science-based cutaway design — the goal is to cut unsprung weight without giving up structural stiffness at the piston bores.
Why It Works
- A forged fixed caliper flexes far less under load than a floating cast-iron unit, so pedal travel stays consistent and the bite point doesn't wander as brake temperatures climb.
- The progressive six-piston layout — 30mm, 34mm, and 38mm pistons per side — applies clamping force gradually across the pad, which is what gives the 8657S its linear, controllable feel rather than an on/off bite.
- Stepping up to a 405mm rotor adds swept area and thermal mass over the stock disc, so the system has more capacity to absorb and shed heat before fade sets in.
- Two-piece heat-insulated pistons with dust boots keep fluid temperature more stable at the caliper, which helps hold a firm pedal during repeated hard braking.
- With a caliper package designed around an 18-inch-or-larger wheel minimum, this kit clears the Zeekr 001's factory 21-inch wheels as installed.
Installation Gallery
What caliper and rotor make up this TTSPORT kit for the Zeekr 001?
What else comes in the kit besides the caliper and rotor?
What wheel size does this Zeekr 001 install use?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.