BMW 3 Series (325) Big Brake Kit Upgrade / TTSPORT Classic 5410
The BMW 325 pairs a 245-hp turbo four with a 0-60 time around 6 seconds, but the factory brakes are built for daily commuting, not repeated hard stops. On this 2020 BMW 3 Series, the owner swapped the single-piston front calipers for a TTSPORT TT5410 forged four-piston big brake kit — here's what changed and why.
With 350 N·m of torque on tap and a genuine appetite for spirited driving, this 325 needed brakes that could match its performance ambitions. The factory single-piston setup was the weak link — the goal here was a direct upgrade path without touching wheel size.
Vehicle & Kit Specs
| Item | Specification |
|---|---|
| Vehicle | 2020 BMW 3 Series (325), 18-inch wheels |
| Front caliper | TTSPORT TT5410 split forged four-piston caliper |
| Front rotor | TTSPORT TT355, 355 x 32mm high-carbon heat-treated drilled rotor |
| Lines | TTSPORT stainless steel brake lines |
The TT5410 caliper and TT355 rotor were installed as a matched pair, replacing the OEM single-piston caliper and factory rotor on the front axle.
Why It Works
- Going from a single-piston caliper to the TT5410's four pistons spreads clamping force more evenly across the pad, so the pedal responds more linearly instead of needing extra travel to build bite.
- The 355x32mm TT355 rotor adds swept area and mass over the factory disc, giving the system more heat capacity before fade sets in; the drilled surface helps vent that heat.
- Stainless steel lines resist the expansion that rubber hoses show under pressure, keeping pedal feel firm and consistent stop after stop.
Installation Gallery
What does the TTSPORT TT5410 kit include for this BMW 325?
What wheel size does this BMW 325 run with the TT5410 kit installed?
Need fitment confirmation? Choose the closest TTSPORT series or send your vehicle, wheel size, and intended use before ordering.