How a car works

All partsBMW M4 CSLSuspension & 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.

MaterialAluminium housing, steel rack
SpecRatio 14.6–11.0:1
2.2 turns lock-to-lock
Steering rack highlighted on the car

Nearby