Test air leakage rate: With a fully-charged air system (typically 125 psi), turn off the engine, release the service brake, and time the air pressure drop. The loss rate should be less than 2 psi in 1 minute for single vehicles and less than 3 psi in 1 minute for combination vehicles.
Construction on the Coronado Bridge began in 1967. Almost 500 prestressed concrete piles were fastened to the sea floor of the bay to provide the foundations for the bridge. The steel and concrete components were largely built offsite, then assembled together from marine construction barges over the bay.
Construction Timeline Golden Gate Bridge December 1932 to April 1937. Additional KEY DATES in the History of the Golden Gate Bridge. December 22, 1932: Extending from Fort Baker pier, the construction of a 1,700 foot-long access road began to access the construction sites for the Marin anchorage, pier and tower. January 5, 1933: Construction officially started.