All parts › BMW M4 CSL › Suspension & steering › Steering rack
Steering rack
Part of Suspension & steering · about $2,400 to replace
What it is
Electric power steering rack, variable ratio.
What it does
Turns steering-wheel motion into tie-rod travel with electric assist.
How it fails
Clunk over bumps is rack bushings; motor failure is rare.
| Material | Aluminium housing, steel rack |
|---|---|
| Spec | Ratio 14.6–11.0:1 |
| 2.2 turns lock-to-lock |