You said you can hear a metal to metal sound before stopping....

This is exactly what happened to me. Turned out to be the front flex disc. Changed it, now no more metal to metal sound. Have it checked!

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Agron
1989 300E ("E 300"-Badged)
Monotoned Astral Silver w/ rear lid deck panel
97 Style Replica E420 Rims 205/55/16
Euro Headlights
Clear Corners
94/95 Taillights
Black Grille Insert
Chrome Exhaust Tips
20% Tint
Pioneer Sound system w/ Sub-enclosure and CD-changer