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Factory Rear Stopping Feel Restored on the WRX
Worn rear rotors leave the WRX with a soft pedal and uneven pad wear. This PowerStop Autospecialty replacement is cast to the original rear dimensions for the 2015-2021 Subaru WRX, so the stock caliper, pads, and hub bolt up without shims or spacers. Part number JBR1701 is a plain vented one-piece iron rotor supplied as a single unit.
Key Features
- Direct-fit rear replacement cast to original equipment dimensions
- One-piece iron construction with a plain, non-directional friction surface
- Vented design carries heat away during repeated stops
- Natural finish with no coating to remove before installation
- Machined for stock caliper clearance and a 114.3 mm hub bolt circle
Fitment
| Year | Make | Model | Position |
|---|---|---|---|
| 2015-2021 | Subaru | WRX | Rear |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | JBR1701 |
| Rotor type | Vented |
| Rotor style | Plain |
| Construction | 1-piece iron |
| Finish | Natural |
| Position | Rear |
| Rotor diameter | 285.75 mm (11.25 in) |
| Rotor height | 63.5 mm (2.5 in) |
| Nominal thickness | 9.906 mm (0.39 in) |
| Minimum thickness | 8.382 mm (0.33 in) |
| Bolt circle | 114.3 mm (4.5 in) |
| UPC | 889906330776 |
What's Included
- 1 rear brake rotor
About PowerStop
PowerStop engineers replacement and upgrade braking components for specific vehicle applications, with the Autospecialty line covering original equipment style rotors for daily driven cars and light trucks.
FAQ
Which position does this rotor serve?It replaces one rear rotor, so a full axle service takes two.
Do I need to remove a coating before installation?No. The natural cast surface only needs a solvent wipe to remove shipping oil before the pads touch it.
Will the stock caliper and pads still fit?Yes. The rotor keeps the original diameter, height, and thickness, so the caliper bracket and pad wear window stay in the factory range.
What hub pattern does it use?The mounting face uses a 114.3 mm five lug bolt circle matching the WRX rear hub.
How thin can the rotor get before replacement?Machining or wear below 8.382 mm means the rotor has reached its discard limit.
Is this a drilled or slotted rotor?No. The friction surface is plain, which keeps pad life and noise closer to factory behavior.
Should the rear pads be replaced at the same time?New pads bed evenly to a new surface, so replacing both together gives the most consistent pedal feel.
Does it work with the electronic parking brake?Yes. The rotor keeps the factory parking brake drum surface and dimensions used by the WRX rear caliper.
Installation Instructions
- Raise and support the vehicle, then remove the rear wheel.
- Retract the electronic parking brake using the service procedure, then remove the caliper and bracket.
- Remove the old rotor and clean the hub face of rust and debris.
- Compare the new rotor thickness and diameter against the removed part.
- Fit the rotor, reinstall the bracket and caliper, and torque all fasteners to the factory specification.
- Bed the brakes with a series of moderate stops before normal driving.
Prop 65 Warning
WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov
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