Girodisc Cadillac CT4-V Blackwing Rear Rotors

These Girodisc A2-318 2-piece rear rotors are a direct bolt-on for the CT4-V Blackwing, preserving parking brake function and ABS while reducing rotating mass and improving heat rejection compared to 1-piece rotors.

A2-318 Vehicle Fitment

• Cadillac CT4-V Blackwing – Rear

Efficient Cooling & Quiet Operation

High-carbon iron rings with curved vanes act as a centrifugal pump to move air through the disc. Reusable 6061-T6 hats and spring-preloaded floating hardware allow thermal expansion without the rattle typical of loose floating setups.

Features

• Direct OE replacement; no modifications required
• 2-piece floating construction reduces unsprung/rotational mass
• Curved vane internal geometry for airflow and cooling
• Reusable aluminum hats; cadmium-plated high-strength pins
• Manufactured and assembled in Bellingham, WA
• Sold/priced per pair

A2-318 Girodisc Cadillac CT4-V Blackwing Rear Rotors FAQs

Minimum service thickness? Girodisc recommends replacing rear rings at 26 mm or sooner if a crack reaches the ring edge.

Are dust shields or parking brake affected? No — dimensions maintain OE parking brake function and shield clearances.

Will these change brake balance? No — they retain OEM geometry and bias.

Which rear rings match? Use D2-318 rear replacement rings.

Related Products

• A1-318 Girodisc Cadillac CT4-V Blackwing Front Rotors
• D1-066 Girodisc 380×34 Front Replacement Rings
• D2-318 Girodisc Cadillac CT4-V Blackwing Rear Replacement Rings