BMW 3 Series (G20) Big Brake Kit Upgrade / TTSPORT Evolution ES6
Braking power is one of the most basic safety margins a car has, and it matters most in the moment you least expect it. The factory two-piston caliper on a BMW 325i (G20) works fine for daily driving, but it runs out of headroom fast once speeds climb or the pedal gets worked hard and repeatedly. Owner SmallCCovo swapped the stock setup for a TTSPORT Evolution Series ES6 big brake kit — here's the breakdown of what went on the car.
A six-piston caliper gives the pads a much larger contact area than the stock two-piston unit, spreading clamping force more evenly across the rotor face. That translates into more consistent bite and a more predictable pedal, especially under repeated hard stops.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | BMW 3 Series 325i (G20), 19-inch factory wheels |
| Front caliper | TTSPORT ES6 six-piston caliper |
| Front rotor | TTSPORT 355mm high-carbon heat-treated rotor |
| Rear rotor | TTSPORT 343mm high-carbon oversized rotor (paired with factory rear caliper) |
| Bracket | Custom vehicle-specific caliper mounting bracket |
| Pads / lines | TTSPORT high-performance street pads, TTSPORT stainless steel brake lines |
| Hardware | Brake fluid, mounting bolts, and fixing hardware |
The front calipers on this build are TTSPORT's ES6, so here's the full spec sheet for that unit.
| Brake Caliper | |
|---|---|
| Series | Evolution Series |
| Model / Application | ES6 |
| Axle Position | Front |
| Piston Count | 6-piston |
| Piston Type | Two-piece heat-insulated pistons with dust boots |
| Piston Diameter | 27 mm × 2 / 32 mm × 2 / 38 mm × 2 |
| Caliper Dimensions | L 294 mm × W 155 mm × H 84 mm |
| Total Piston Area | 50.2 cm² per caliper, all pistons combined |
| Manufacturing Process | Two-piece forged aluminum body |
| Net Weight | 3.95 kg per caliper, without pads |
| Surface Finish | High-temperature gloss coating |
| Recommended Wheel Size | 18 in or larger |
| Recommended Rotor Size | Ø355–380 mm × 32 mm |
| Fitment & Installation | |
| Minimum Spoke Clearance (mm) | 99 |
| 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 ES6 body is a two-piece forged unit, and TTSPORT uses a through-bolt reinforcement on this caliper for added structural rigidity — a forged, reinforced body flexes less under hard clamping than a factory caliper, which keeps pedal feel firm instead of going long and mushy under load.
- Two-piece heat-insulated pistons with dust boots and upgraded piston seals hold consistent sealing and performance under sustained hard use.
- An asymmetric piston layout (large/medium/small) evens out clamping pressure across the pad face for more linear, predictable braking rather than an uneven bite.
- The 355mm front and 343mm rear rotors add mass and surface area over the stock discs, giving the system more thermal capacity to resist fade during repeated hard stops.
- The kit uses a custom vehicle-specific bracket sized for this car's factory 19-inch wheels, so the ES6 caliper mounts without altering wheel offset.
Installation Gallery
FAQ
What brake hardware did this BMW 325i (G20) receive?
What's included in the TTSPORT ES6 big brake kit?
What wheel size does the ES6 caliper require?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.