Preserving Black color values when converting color PDF to grayscale

I opened a full colored PDF document (exported from InDesign using Profile: Euroscale Coated v2) in Photoshop and tried to convert it to grayscale (image > mode > grayscale) and noticed that the black color values changed. text for example that was 100% black in the PDF document became a screen of 91% black.
is there a way to preserve color values when converting full color PDF documents to grayscale?
or in other words WHICH is the correct way to convert full color PDF documents or full color InDesign files to grayscale?
I am using Adobe CS 3, Acrobat 8 Professional, on Mac OS 10.5.5

Before you open the PDF in Photoshop, set PS's Color Settings to Photoshop 5 Default Spaces. When you open the PDF set the Mode to Grayscale in the Import dialog. Just remember to reset your color settings when you're done.
Edit: Also, if you want to match black percentages as well as 100% black, set the Photoshop Color Settings to Photoshop 5 Default Spaces with the Gray working space to Dot Gain 20%.

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Preserving Black color values when converting color PDF to grayscale

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