Big Brake Kits

The best big brake kits pair larger rotors with multi-piston calipers and matched pads — the Brembo Gran Turismo kit for the FR-S/BRZ is the benchmark upgrade in this collection, while Brembo OE Gold kits give 15-21 WRX owners a direct-fit package. Kartboy big brake adapters let early WRX rears run larger 2-pot calipers for a fraction of a full kit's cost.

A big brake kit does more than shorten stopping distances: bigger rotors add thermal mass, so the brakes resist fade during repeated hard stops. The collection covers full kits plus supporting pieces like caliper adapters — especially popular on early WRXs where the factory rear brakes were the weak link.

Fitment is the thing to get right. Caliper clearance depends on your wheels — check the kit's minimum wheel size against what you run. Budget for fresh fluid and a proper bleed. Drilled rotors can be noisy; slotted is the safe choice for street cars.

Popular brands include Brembo for Gran Turismo and OE Gold big brake kits, Kartboy for big brake adapters, and Torque Solution for rear caliper adapters.

Related collections: all brake parts, brake pads, brake rotors, and PowerStop brake kits. Featured products: the Brembo Gran Turismo big brake kit for FR-S/BRZ, the Brembo OE Gold drilled front kit for 15-21 WRX, and the Kartboy V2 rear big brake adapters. Also see our WRX STI brake system upgrade guide.

Do big brake kits fit under stock wheels?

Often not. Check the kit's minimum wheel diameter and your wheel's spoke clearance before ordering.

Are caliper adapters a good alternative to a full kit?

For rear brakes, yes — adapters from Kartboy or Torque Solution let you bolt larger calipers onto factory hubs for much less than a full kit. Fronts carry most of the braking load, so spend the real money there.

Do I need a tune with a big brake kit?

No tune needed. You will need to bleed the system and bed in the pads, and a fluid upgrade to high-temp DOT 4 is smart if you track the car.

Drilled or slotted rotors?

Slotted rotors are the safe all-around choice — they wipe the pad clean without the crack risk drilled rotors can develop under hard track heat. Drilled looks great and works fine for street use.