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I have a 2002 Volkswagen passat estate, diesel. Recently the brakes completely failed while driving in ice conditions -20°C on a mountain road (no servo assistance) as I descended into warmer air they started working again. The Volkswagen garage said that there is a join in the vacuum line that can collapse (where it passes through the engine compartment bulkhead) & they inserted a short section of rigid plastic hose into it. This seemed to work until a few days later when again at about minus 7°C I put on the break & they locked on, the pedal also stayed depressed. I found that I could pull the pedal back up with my foot slowly & the breaks would release. As soon as the temperature goes above minus 2°C the breaks start to work perfectly. Also when this happens there are no fault lights that come on. Any ideas? Cheers.