BRZ aluminum front knuckles rule out most Gen1 brake kits
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What causes "BRZ aluminum front knuckles rule out most Gen1 brake kits" on the Toyota GR86 / Subaru BRZ (ZN8/ZD8, 2022+), and how is it fixed?
Subaru gave most 2022+ BRZs new aluminum front knuckles, while the GR86 keeps cast-iron knuckles like Gen1. Fix: Buy a kit that lists the 2022+ BRZ specifically, such as the vendor-listed Brembo B-M4 kit or revised AP Racing kits, or swap to GR86 or Gen1 knuckles.
Symptoms
A big brake kit or Performance Package Brembo setup made for 2013-20 cars will not bolt to a 2022+ BRZ, even though it fits a 2022+ GR86.
Cause
Subaru gave most 2022+ BRZs new aluminum front knuckles, while the GR86 keeps cast-iron knuckles like Gen1. Brake mounts differ, so many kits were redesigned or are listed for the GR86 only.
Fix (summary)
Buy a kit that lists the 2022+ BRZ specifically, such as the vendor-listed Brembo B-M4 kit or revised AP Racing kits, or swap to GR86 or Gen1 knuckles. Confirm your knuckle before ordering parts.
Related parts
- 2017-20 BRZ Performance Package Brembo brakes (4-piston front, 2-piston rear)
- Counterspace Garage Brembo GT B-M4 front big brake kit (86 / BRZ)
Related build entries
Other ZN8/ZD8 problems
- Excess RTV sealant clogging the oil pickup (early FA24)
- Oil pressure drops in long, fast right-hand turns on track
- Rear turn signals may not work (2022 BRZ and GR86 recall)
- Check engine light for cam timing, evap leak-check or ECM communication codes (ECM update)
- Automatic transmission code P0613 (2022 BRZ TCM update)
- Wrong load-capacity label on some dealer-accessorized GR86s
More for this car
- All Toyota GR86 / Subaru BRZ (ZN8/ZD8, 2022+) fitment answers · ZN8/ZD8 common problems
- Newsletter archive: past issues with every new and corrected entry
Sources
- Toyobaru 86 Brake Kits: Gen.1 vs. Gen.2 — Essex Parts (AP Racing distributor, Feb 2022) (vendor article; read 2026-10-26; full page read)
- 2022+ BRZ/GR86 BBK fitment guide — FT86CLUB (forum; posted by a brake-kit vendor's representative) (forum thread; read 2026-10-26; full page read)
- Big Brake Kit Guide for Gen1 and Gen2 2022+ Toyota GR 86 and Subaru BRZ — Counterspace Garage (brake-kit vendor, Mar 2022) (vendor article; read 2026-10-26; full page read)
- 2022+ ZD8 Subaru BRZ Wheel Fitment Guide — rimlist (wheel guide site with affiliate links) (editorial; read 2026-10-26; full page read)
Summaries are in our own words. Not repair instructions; consult the factory service manual.
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