Clutch Hydraulics

The clutch is hydraulically actuated using a master cylinder (at the pedal) and slave cylinder (at the transmission bell housing).

Clutch Master Cylinder

• Located at the firewall, connected to the clutch pedal
• Shares brake fluid reservoir with the braking system
• Failure symptoms: soft or spongy clutch pedal

Clutch Slave Cylinder

• Mounted on the transmission bell housing
• Replace preventively during clutch replacement

Clutch Delay Valve (CDV)

The E46 has a clutch delay valve that slows clutch engagement.

• Many enthusiasts delete the CDV for more direct clutch feel
• CDV delete is a popular modification