Brakes Not Working When Turning On My S60 2007

[abscate]

Ha! That's a great spell check error....I never knew high altitude could remove hair ...

[oragex]

That is a little strange it works once is warmed up. ...

I think not unusual, what OP describes was exactly the symptoms when the pump was bad on our S60. Probably not very unusual it actually makes sense. See jimmy57's post for much more insight but basically once the engine warms up and develops vacuum the pump is not needed.

That should be it. I'd start first with the switch, then as jimmy57 describes the pump test. If the switch is fine, the pump may burn from the brake booster seal - small warning, most used brake boosters have this issue, is it better to replace only the seal with a new one, there's link in the video description (it 'may' be possible to replace the seal with the booster on the car, I will try this this summer) www.youtube.com/watch?v=jKcDOLIYR3A