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I personally haven't experienced this failure due to stepping too hard on the pedal during bleeding (I've always bled using power bleeding) -- although I did once experience this through normal wear (about 175,000 miles) of the seal.
However, read through the archives -- search for Master Cylinder, bleeding, or something like that -- and you'll discover that this is a widespread event, viz. that the M/C suddenly fails during the course of a routine bleeding when the pedal method is used. At least once a month, sometimes more, someone writes that they did a brake bleeding using the padal method and now their master cylinder is 'toast'; and I'm sure others here could corroborate. Then you be the judge. I only meant to help you by pointing this out, not get into an argument with you.
As for explaining this in the manuals (assuming you're using the 'real' green Volvo publications and not some junk like Haynes (although Bentley is good) -- although I've never seen those instructions in my green manuals -- is that sometimes real shop manuals assume certain prior training of the reader and leave out subtle things that an untrained amateurs may not be aware of (like never press too far on the brake pedal).
Enough said.
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