-25%
Click to zoom in
OE-Style Stopping Power for Your Brembo-Equipped STI
The RK2123XD is a set of EBC RK Series Premium rear brake rotors built for 2018-2021 Subaru WRX STI models equipped with the 2.5T engine and Brembo calipers. These are vented, one-piece plain rotors that replace the factory rear discs with an OE-style, direct-fit design, giving Brembo-equipped STI owners a straightforward rotor replacement without changing brake feel or requiring modified hardware. The RK2123XD is sized specifically for the rear axle of the Brembo-brake STI, matching the 326mm rotor diameter used on this generation.
Key Features
- Vented, one-piece rotor construction
- Plain rotor style for OE-style direct replacement
- 326mm (12.83 in) rotor diameter matched to the rear Brembo brake package
- Direct bolt-in fit for 2018-2021 WRX STI 2.5T models with Brembo calipers
- Sold as a set for both rear positions
Fitment
| Year Range | Make | Model | Notes |
|---|---|---|---|
| 2018-2021 | Subaru | WRX STI | 2.5T engine, rear axle, requires Brembo caliper brake package (Base, Limited, and Type RA trims use this Brembo rear brake setup) |
Specifications
| Detail | Value |
|---|---|
| MPN | RK2123XD |
| UPC | 889668257823 |
| Position | Rear |
| Rotor Construction | Vented, one-piece |
| Rotor Style | Plain (OE-style) |
| Rotor Diameter | 326mm (12.83 in) |
| Quantity | Sold as a set (2 rotors) |
What's Included
- Two (2) EBC RK2123XD rear brake rotors
About EBC
EBC Brakes designs and manufactures brake pads, rotors, and lines for road, race, and off-road applications worldwide. The RK Series Premium rotor line is EBC's OE-style replacement rotor program, built to restore factory braking performance on vehicles like the Brembo-equipped Subaru WRX STI.
FAQ
What is the RK2123XD?It is a set of EBC RK Series Premium rear brake rotors for 2018-2021 Subaru WRX STI 2.5T models with Brembo calipers.
What is the rotor diameter for this part?These rotors measure 326mm, or 12.83 inches, in diameter.
Are these rotors vented or solid?They are vented, one-piece rotors.
Do these rotors work with the non-Brembo STI brake package?No, this rotor is sized for the Brembo rear caliper setup used on the 2018-2021 WRX STI; a non-Brembo STI or standard WRX uses a different rotor size and is not covered by this fitment.
How many rotors come in this listing?This listing is sold as a set covering both rear positions.
Is this a drilled or slotted rotor?No, this is a plain OE-style rotor rather than a drilled or slotted design.
What UPC is associated with this part?The UPC for this part is 889668257823.
Will these rotors work with the factory rear brake pads?These are OE-style replacement rotors designed to work with the factory pad and caliper setup on Brembo-equipped STI models; always check pad wear and condition when installing new rotors.
Install Instructions
- Raise and safely support the vehicle, then remove the rear wheel on the side being serviced.
- Remove the caliper and caliper bracket per the vehicle's factory service procedure, and support the caliper so the brake line is not under tension.
- Remove the factory rotor from the hub.
- Clean the hub mating surface and inspect for corrosion or damage before installing the new rotor.
- Install the EBC RK2123XD rotor, then reinstall the caliper bracket and caliper per factory torque specifications.
- Reinstall the wheel, torque to spec, and bed in the new rotor per EBC's recommended break-in procedure before normal driving.
Brake Rotors
Brake rotors for street, track, tow, and off-road builds are stocked at Black Ops Auto Works. Shop drilled and slotted rotors, slotted-only rotors, dimpled rotors, blank OE-replacement rotors, two-piece floating rotors, high-carbon iron rotors, and vehicle-specific rotor packages for Hellcat, Trackhawk, TRX, HEMI, Coyote, LS, LT, and import platforms. Every product is filterable by year, make, model, trim, and factory brake package so the correct rotor ships the first time. Black Ops Auto Works carries 2,884 brake rotor SKUs across drilled, slotted, two-piece, and OE-replacement categories. What This Collection Covers Brake rotor selection is one of the two friction decisions on the vehicle, the other being pad compound. This collection covers rotor styles, metallurgy, sizing, and vehicle-specific fitment for daily drivers, sport cars, track builds, tow rigs, and off-road platforms. Rotor Styles Drilled and slotted, slotted-only, dimpled, blank OE-replacement, and two-piece floa...
View Brake Rotors Products
Brake Rotors -OE
OE brake rotors for daily drivers, luxury vehicles, trucks, and SUVs are stocked at Black Ops Auto Works. Shop OE-equivalent rotors, UV coated rotors, blank factory replacement rotors, front rotors, rear rotors, and vehicle-specific rotor sets built to match the original factory diameter, thickness, hat height, and metallurgy for a wide range of domestic, import, and luxury platforms. Every product is filterable by year, make, model, trim, and factory brake package so the correct rotor ships the first time. Black Ops Auto Works carries 889 OE brake rotor SKUs across coated, blank, and vehicle-specific replacement categories. What This Collection Covers OE brake rotors are the correct choice when the goal is to restore factory stopping performance and quiet operation after the original rotors wear past minimum thickness or develop hot spot discoloration. Unlike drilled and slotted upgrades built for aggressive street or track use, OE rotors prioritize a smooth friction surface, l...
View Brake Rotors -OE Products
Brakes
Brake parts and complete brake kits for cars, trucks, SUVs, Jeeps, and track builds are stocked at Black Ops Auto Works. Shop brake pads, brake rotors, big brake kits, brake calipers, caliper covers, stainless steel brake lines, brake master cylinders, brake hardware, brake drums, brake shoes, hand brakes, and brake adapters for HEMI, Hellcat, Trackhawk, TRX, LS, LT, Coyote, and EcoBoost platforms. Every product is filterable by year, make, model, trim, engine, and drivetrain so the correct part ships the first time. Black Ops Auto Works carries 14,180 brake SKUs across pads, rotors, big brake kits, calipers, and hydraulic categories. What This Category Covers Brakes are the highest-priority safety upgrade on any modified vehicle. Any horsepower, tire, or suspension change increases the demand placed on the braking system, and a correctly matched pad, rotor, line, and fluid package produces measurable improvements in stopping distance, pedal feel, and heat capacity. This collect...
View Brakes Products
EBC Brakes
EBC Brakes performance pads, rotors, and brake kits are stocked at Black Ops Auto Works. Shop Greenstuff, Redstuff, Yellowstuff, Bluestuff, and Orangestuff pad compounds along with USR slotted, GD drilled-and-slotted, BSD blade, 3GD triple-slotted, and 2-piece racing rotors for cars, trucks, SUVs, and motorcycles. Every product is filterable by pad compound, rotor design, and vehicle year, make, model, and trim so the correct fitment ships the first time. Black Ops Auto Works carries 6,232 EBC Brakes SKUs across pads, rotors, kits, and brake lines. About EBC Brakes EBC Brakes is one of the largest brake pad and rotor manufacturers in the world, producing performance friction and rotors for street, track, off-road, and motorcycle use. EBC pads are coded by compound so drivers can match friction material to actual driving style rather than appearance alone. Pad Compound System Greenstuff for daily driving, Redstuff for low-dust street performance, Yellowstuff for aggressive street...
View EBC Brakes Products