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Message: <blockquote data-quote="mcgovern61" data-source="post: 95881" data-attributes="member: 59">To add one more side story about engine vacuum.  I agree that the vacuum is lowest when the engine is accelerating and at very high RPM.  Many, many moons ago, I had a '69 LTD wagon with a 390 engine.  The power brakes were vacuum controlled.  Somehow, (not sure how  :whistling: ) I found myself in a street race.  That big old wagon had quite the get up and go!!  Speedo might have been pushing slightly higher than 120 MPH before the end of the race and the street came to a dead end.Well......I applied the brakes with the car moving along at high engine RPM and maybe a little faster than I should have and guess what..........no brakes at that speed! :shock:   Just a rock hard pedal!!(I shudda read the manual first! :whip:  :rtfm: )  I finally stopped the car by downshifting, parking brake and keeping my foot on the main brake pedal. :roll: At normal speed, the brakes worked great!  (Just making the point about vacuum being higher at idle  :hihihi: )Lesson learned........ <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite10" alt=":oops:" title="Oops!    :oops:" loading="lazy" data-shortname=":oops:" />  :smilie_happy:</blockquote>