Vacuum Pump Implosion? W115 240D

[diametricalbenz]

I was driving home in the W115 240D on the freeway and noticed some louder than usual engine noises. All of the sudden when traffic built up I pressed down on the brakes and no vaccum boost was available! I was going through south central and the engine was still running and there was oil pressure so I pushed on.

When I got home I found that the whole front end of the vacuum pump had cracked from top to bottom.

Has anyone seen something like this?

I guess it's metal fatigue from 32 years of operation